Low-moisture footwear sanitizing system

The present disclosure describes a system for sanitizing footwear having a pan, two or more mats positioned in the pan, and a spraying system to spray disinfectant directly on one of the mats. One of the mats is an absorbent mat, which may be a reusable mat, a disposable pad, or a plurality of disposable pads. The other mat is a heavy mat and has one or more cutouts. The heavy mat is positioned on top of the absorbent mat. The system for sanitizing footwear is a quick and easy way to sanitize the soles of footwear in an environment that cannot have moisture or the tracking of water.

FIELD

The present disclosure is related generally to a system for sanitizing footwear in an environment that cannot have moisture or the tracking of water away from the sanitizing system.

BACKGROUND

Previous foot sanitation systems included wetted baths (e.g., boot dip water bath) having a pool of sanitizing liquid into which the user stepped to sanitize his footwear. Other prior systems included misters that sprayed the sanitizing liquid on the user's footwear. These systems were often messy and resulted in moisture or liquid being tracked by the user away from the system. The resulting puddles or moisture could create a slipping hazard or bring moisture into an environment that could not have the excess moisture present. Additionally, previous systems require regular cleaning and maintenance to keep the systems clean and functioning.

Accordingly, there exists a significant need for a footwear sanitation system that does not have standing liquid or track moisture or liquid into the area proximate to the footwear sanitation system. There also exists a need for a system with disposable portions such that cleaning and maintenance is minimized.

SUMMARY

These and other needs are addressed by the various embodiments and configurations of the present disclosure. The system of the present disclosure is a quick and easy way to sanitize the soles of footwear (e.g., street shoes, boots, or other shoes) in an environment that cannot have moisture or the tracking of water as would be typical with a traditional boot dip water bath system or a misting system.

It is one aspect of the present disclosure to provide a system with one or more mats for sanitizing footwear that does not require excessive moisture. For example, embodiments of the present disclosure do not track water, liquid, or moisture away from the sanitizing mat in the system. The terms “pad” and “mat” are used interchangeably herein.

Some embodiments of the system include an electromechanical system that sprays a sanitizing chemical to a predetermined location within a pan with an absorbable mat for the user to step on, wherein the sanitizer is then deposited to the soles of the user's shoes. In various embodiments, the sanitizing chemical is fast-drying.

Fast-drying refers to the time it takes the sanitizing chemical to dry or evaporate, i.e. how volatile the solution is. Volatility is quantified by the tendency of a substance to vaporize. Volatility is directly related to a substance's vapor pressure. At a given temperature, a substance with higher vapor pressure vaporizes more readily than a substance with a lower vapor pressure. Thus, the sanitizing chemical (also called the sanitizing solution herein) has a higher vapor pressure than water and a higher vapor pressure than typical footwear sanitizing solutions.

It is another aspect of the present disclosure to provide a system that quickly and easily sanitizes the soles of footwear. In some embodiments, the system is non-electronic and consists of a system sanitizer pan (also called a “tray” herein), a packet of pre-saturated or non-saturated absorbent pads, and a cover.

It is one aspect of the present disclosure to provide a system for sanitizing footwear with disposable pads that requires little cleaning and/or maintenance.

In one embodiment the pad is configured to fit in the sanitizing pan. Thus, the pad is sized and shaped similar to the pan. The pad may be held in place in the pan using a clamp, bar, weight, slot, or lever. In one embodiment, the mechanism to hold the pads in place is a spring-loaded bar. A screwdriver or other tool can be used to depress the bar, activate the spring, and lift the bar. The bar may be self-tightening on the lower pads after a top pad is removed for disposal.

In some embodiment, the pan includes one bar or other pad-retaining mechanism. In other embodiments, the pan includes two bars or other pad-retaining mechanisms positioned opposite one another in the pan. For example, one bar or other pad-retaining mechanism may be positioned in the front of the pan (proximate the user's toes when the user steps into the pan and onto the pad) and another bar or pad-retaining mechanism is positioned in the rear of the pan (proximate the user's heels when the user steps into the pan and onto the pad). Still other embodiments may have three or more pad-retaining mechanisms.

In one embodiment, the pan holds one or more absorbent pads in a cavity in the pan. The pads may be restrained in some manner such that they remain in the pan when a user steps onto the pad and off of the pad. The system may also include a cover that can be placed on the pan after each use, nightly, or between shifts depending on the frequency of the use of the system. The cover may be optional and provided for the pan for longer gaps between uses in order to prevent the pads from drying out.

In various embodiments, the absorbent pad is only one layer. In other embodiments, the pad is multiple layers, which may be the same material or different materials. The pad can be sold and packaged individually or packaged two or more pads per package. In some embodiments, the pads are pre-saturated. In alternative embodiments, the pads are dry and come with a container of liquid sanitizer to add to the pad(s) once the pad(s) is in position in the pan.

In some embodiments, the pads are disposable. In other embodiments, the pad is washable and reusable.

In some embodiments, the pads are packaged in various quantities, from one pad per package to any number of pads per package. Providing more than one absorbent pad in the system allows for the top pad to be replaced daily or multiple times per day as the pads wear or dry out. The quantity of pads per package or used in the system may be determined by the following: designed for daily change out may include 5-7 pads such that the package lasts one week depending on the length of the work week, designed for daily change out may include 10 pads such that the package lasts two five-day weeks, designed to change the pad multiple times per day at an average of two times per shift on a three-shift day may include 6 pads such that the package lasts one 24-hour day, designed to change the pad multiple times per day at an average of one time per shift on a four-shift day may include 4 pads such that the package lasts one 24-hour day, designed to change the pad multiple times per day at an average of one time per shift on a three-shift day may include 3 pads such that the package lasts one 24-hour day, designed to change the pad multiple times per day at an average of one time per shift on a two-shift day may include 2 pads such that the package lasts one 24-hour day, designed to change the pad multiple times per day at an average of two times per shift on a two-shift day may include 4 pads such that the package lasts one 24-hour day, designed to change the pad two times per day may include 10 pads such that the package lasts one five-day week, or any other desired combination.

In some embodiments, the pre-saturated absorbent pads are saturated with a sanitizing chemical and packaged in smaller quantities, i.e., 1-3 absorbent pads per package. The dry pads are typically packaged with 3-10 pads per package and come with a separate container of the sanitizing chemical that can be poured onto the pads once the pads have been installed in the pan. The sanitizing chemical for the dry pads can be in any size container from about a half pint (a cup) to about a gallon container.

In some embodiments, including the embodiments that employ one or more reusable mats, the sanitizing chemical can come in any size container from about a quart to a 55 gallon drum or a bag in a box.

Some embodiments of the mat system include a pan with an absorbent mat for the user to step on, where the mat is saturated with sanitizer and the sanitizer is deposited from the mat to the soles of the user's shoes.

In some embodiments, the system comprises two or three different mats. The first mat is the top mat, which is a heavy mat with cutouts for the shoe area. The top mat is typically reusable. The cutouts may be shoe-shaped, oval-shaped, or rectangular. The second mat (or middle mat) is the absorbent mat with the sanitizing chemical and is the mat on which the user actually stands. The second mat may be reusable and washable. Alternatively, the second mat may be disposable and replaced as necessary. The second mat is positioned below the first mat in the pan. The third mat is optional and is positioned below the second mat in the pan.

If the system is placed in front of an automated handwasher, the user can be washing his hands while standing in the pan with the mat or pad having the sanitizing chemical. In some embodiments, the handrail on the system is removable such that the sanitizing pan can be placed directly in front of an automated handwashing system.

The area where the user stands on the mat to have his shoe soles sanitized is called the “shoe area” herein.

In various embodiments, the sanitizing chemical is fast-drying. In one embodiment, the sanitizing chemical is a mixture of isopropyl alcohol and quaternary ammoniums. In some embodiments, the pads consist of mostly isopropyl alcohol. In some embodiments, the chemical is ready to use (“RTU”) and does not require dilution. Other embodiments may require dilution with water and/or alcohol.

This system can be used as a standalone footwear sanitation system or can be used in conjunction with a handwashing system, which may be an automated system or a sink for manual handwashing.

In chemistry, absorption is a physical or chemical phenomenon or a process in which atoms, molecules, or ions enter some bulk phase: liquid or solid material. This is a different process from adsorption, since molecules undergoing absorption are taken up by the volume, not by the surface (as in the case for adsorption). A more general term is sorption, which covers absorption, adsorption, and ion exchange. Absorption is a condition in which something takes in another substance. The absorbent distributes the material it captures throughout the whole and adsorbent only distributes it through the surface. The IUPAC definition of absorption is “the process of one material (absorbate) being retained by another (absorbent); this may be the physical solution of a gas, liquid, or solid in a liquid, attachment of molecules of a gas, vapor, liquid, or dissolved substance to a solid surface by physical forces, etc.”

If absorption is a physical process not accompanied by any other physical or chemical process, it usually follows the Nernst distribution law: the ratio of concentrations of some solute species in two bulk phases when it is in equilibrium and in contact is constant for a given solute and bulk phases. The value of constant KNdepends on temperature and is called the partition coefficient. This equation is valid if concentrations are not too large and if the species “x” does not change its form in any of the two phases “1” or “2”. If such molecule undergoes association or dissociation then this equation still describes the equilibrium between “x” in both phases, but only for the same form—concentrations of all remaining forms must be calculated by taking into account all the other equilibria. Absorption can be chemical (reactive) or physical (non-reactive).

“Absorptive” and “absorbent” may be be used interchangeably herein to describe a material, substance, or item that absorbs, i.e., has the power, capacity, or tendency to absorb.

If the pad material is a hydrophilic material and sorption happens via spontaneous imbibition, generally air is trapped in the pores of the pad. Air can fill 30-40% of the whole pore space. Even well connected parts of the pore space will contain air. Factors that prevent complete filling of the pore space are related the geometry of the pore space. Isolated voids will not be filled. Dead-end pores will also be responsible for air trapping. Further, liquid will spread throughout the fabric or material under capillary action. The level of wicking and liquid transportation in a fabric depends on pore sizes and their distribution. Liquid initially occupies small pores and then moves to larger pores.

The absorption capacity of a material may be referred to as the free swell values and given in grams of solution absorbed per gram of fiber (gabsorbed/gfiber). The retention value of the material is given in grams of solution left in the fiber after a pressure (e.g., 20 mmHg) per gram of fiber (gsolution remaing/gfiber).

The wetting phenomenon of textile structures involves numerous processes including immersion, capillary sorption, adhesion, and spreading. The pile length and areal density of the fabric affect the liquid absorption of the fabric. Liquid absorption tends to increase with an increase in the pile length (pile height) and increase in areal density. The percentage of liquid absorbed by fabrics with high loop density is higher than that of fabrics having lower loop density. The amount of liquid a material can absorb is also dependent on whether the fibers are twisted and how compact the fibers are and the material in general is. The more compact and/or twisted the fibers, the less liquid the material can absorb.

In some embodiments, the pad may be a continuous loop, similar to a belt on a treadmill. Thus, the pad belt moves around the belt base and pullies or rollers at each end. The advantage of a moving pad is that users will constantly step on different portions of the moving pad. Additionally, by forcing the user to step on and potentially walk on the moving surface, more sanitizing solution will be transferred to the soles of the user's shoes.

Alternative embodiments may include a tray with a pool of solution and a pad at the bottom of the tray/pool.

Additional embodiments may include the footwear sanitation system described herein (i.e., with a pan, pad, and cover) and also include a mister to disinfect additional surfaces of the user's shoes. Thus, after the user steps on the pad in the pan, the mister also sprays quick-drying sanitizing chemical on the upper portions of the user's shoes (i.e., the portions of the user's shoes other than the sole).

In one embodiment, a footwear sanitizing system is provided comprising: a pan with a bottom positioned on a floor and a cavity opening to an upper side of the pan opposite the bottom; a second mat positioned in the pan; a first mat positioned on top of the second mat within the cavity, wherein the first mat has at least one cutout extending through the first mat to the second mat such that the second mat is accessible through the at least one cutout in the first mat, wherein at least one of a liquid absorbency, permeability, and porosity of the second mat is greater than the first mat; a pump housing interconnected to the pan, the pump housing comprising a sensor, at least one nozzle, and a pump; a controller electrically interconnected to the pump and sensor; and a fluid container in fluid communication with the pump, wherein the fluid container contains a sanitizing solution, and wherein the pump is in fluid communication with the at least one nozzle.

An embodiment can include a cover for covering the pan, wherein the cover engages with the pan to enclose the second mat from an outside environment. In some embodiments, the pan comprises: four outer sidewalls extending upwardly from the bottom of the pan and forming a pan perimeter; a substantially flat bottom surface of the cavity, wherein the bottom surface is substantially parallel to the bottom of the pan; four inner sidewalls extending upwardly from the bottom surface of the cavity and forming a cavity perimeter of the cavity; and an upper edge positioned between and interconnecting the four inner sidewalls to the four outer sidewalls. An embodiment can include four outer sidewalls that are positioned at an angle greater than about 30 degrees as measured from the bottom of the pan, and wherein the four inner sidewalls are substantially perpendicular to the bottom surface of the cavity. An embodiment can include a cavity perimeter that is substantially concentric with the pan perimeter. An embodiment can include an upper edge that is substantially flat and substantially parallel to the bottom of the pan. An embodiment can include a cover for covering the pan, wherein the cover engages with the upper edge of the pan to enclose the mats from an outside environment. An embodiment can have the second mat and the first mat are sized and shaped to fit in the cavity of the pan. An embodiment can include the first mat is at least about twice as dense as the second mat when the second mat is substantially dry. An embodiment can include a cavity that is formed by a substantially flat bottom surface that is substantially parallel to the bottom of the pan and inner sidewalls extending upwardly from the bottom surface. An embodiment can include at least one liner, film, or coating positioned on at least a bottom surface of the cavity. An embodiment can include a sanitizing solution that is fast-drying and wherein the fast-drying sanitizing solution comprises isopropyl alcohol and quaternary ammoniums. An embodiment can include a pan that is comprised of a substantially non-porous material that inhibits the transmission of moisture, and wherein the absorbent material is comprised of a substantially porous and permeable material that adsorbs the sanitizing solution. An embodiment can include the at least one cutout comprises at least first and second cutouts sized to receive footwear of a user, wherein a weight of the first mat is heavier than a weight of the second mat, wherein the at least one nozzle comprises at least first and second nozzles, each of the first and second nozzles being spatially proximate to a corresponding one of the first and second cutouts, and wherein the fast-drying sanitizing solution is sprayed out of the first nozzle in a substantially flat, longitudinal pattern at least half a length of the first cutout and the sanitizing solution is sprayed out of the second nozzle in a substantially flat, longitudinal pattern at least half a length of the second cutout. An embodiment can include a handrail interconnected to the pan or the floor, wherein the handrail is positioned in a front portion of the system, wherein the cover automatically opens and closes in response to a signal from the controller, and wherein, in a first mode, the controller receives a first signal from the sensor indicating the presence of a user at a first spatial location and opens the cover and, in a second mode, the controller receives a second signal from the sensor indicating the presence of the user at a second spatial location and closes the cover. An embodiment can include a sensor that is one or more of a photoelectric eye, a motion detector, an optical sensor, and a pressure sensor. An embodiment can include at least one cutout that has a rectangular shape, shoe shape, or oval shape.

In one embodiment, a footwear sanitizing system is provided comprising: a pan with a bottom and a cavity that is open to a top opposite the bottom; a plurality of absorbent pads positioned in the cavity of the pan, wherein the absorbent pads are sized and shaped to fit in the cavity of the pan, and wherein the absorbent pads comprise a sanitizing liquid; and a clamping bar interconnected to the pan, wherein the clamping bar is positioned on top of the absorbent pads to hold the absorbent pads in place. An embodiment can also include a cover for covering the pan, wherein the cover engages with the pan to enclose the absorbent pads from an outside environment. An embodiment can include a pan comprising: four outer sidewalls extending upwardly from the bottom of the pan and forming a pan perimeter; a substantially flat bottom surface of the cavity, wherein the bottom surface is substantially parallel to the bottom of the pan; four inner sidewalls extending upwardly from the bottom surface of the cavity and forming a cavity perimeter of the cavity; and an upper edge positioned between and interconnecting the four inner sidewalls to the four outer sidewalls. In some embodiments, the four outer sidewalls can be positioned at an angle greater than about 30 degrees as measured from the bottom of the pan, and wherein the four inner sidewalls are substantially perpendicular to the bottom surface of the cavity. An embodiment can also include a cavity perimeter that is substantially concentric with the pan perimeter. An embodiment can include an upper edge that is substantially flat and substantially parallel to the bottom of the pan. An embodiment can also include a cover for covering the pan, wherein the cover engages with the upper edge of the pan to enclose the absorbent pads from an outside environment. In one embodiment, the clamping bar is interconnected to at least one inner sidewall, wherein the clamping bar is spring-loaded, wherein the clamping bar includes a bar with teeth along one edge, and wherein the teeth engage the upper surface of a top absorbent pad in the plurality of absorbent pads. An embodiment can include a clamping bar that is positioned on a first side of the cavity, wherein the pan further comprises a second clamping bar positioned on a second side of the cavity, and wherein the first side of the cavity is opposite the second side of the cavity. In some embodiments, the cavity is formed by a substantially flat bottom surface that is substantially parallel to the bottom of the pan and inner sidewalls extending upwardly from the bottom surface. An embodiment can also include at least one liner, film, or coating positioned on at least a bottom surface of the cavity. In one embodiment, the sanitizing liquid comprises isopropyl alcohol and quaternary ammoniums. In some embodiments, the pan is comprised of a non-porous material that inhibits the transmission of moisture. An embodiment can also include a handle and a rubber trim around a perimeter of a bottom surface of the cover, wherein the rubber trim engages the pan. An embodiment can also include a sensor, a processor in communication with the sensor, and a motor interconnected to the cover, wherein the sensor senses a user approaching the system and transmits a sensed signal to the processor, wherein the processor controls the motor, and wherein the motor, in response to the sensed signal, moves the cover on and off of the pan.

In some embodiments, a method of sanitizing footwear is provided comprising: providing a pan with a bottom, a cavity that is open to a top opposite the bottom, and a clamping bar; placing a plurality of absorbent pads in the cavity of the pan; releasing the clamping bar; sliding the plurality of absorbent pads under the clamping bar; closing the clamping bar on the plurality of absorbent pads; pouring sanitizing solution onto the plurality of absorbent pads; stepping onto a top absorbent pad; stepping off of the top absorbent pad; and placing a cover on the pan.

In various embodiments, a method of sanitizing footwear is provided comprising providing a pan with a bottom and a cavity that is open to a top opposite the bottom; providing a plurality of absorbent pads positioned in the cavity of the pan, wherein the absorbent pads are sized and shaped to fit in the cavity of the pan, and wherein the absorbent pads comprise a fast-drying sanitizing liquid; providing a cover on the pan and a cover opening mechanism; providing a first sensor for receiving sensor data, including detecting an approaching user; sending the sensor data to a processor, including data regarding the approaching user; sending a signal to the cover opening mechanism instructing the cover opening mechanism to remove the cover from the pan; removing the cover from the pan; sensing the user on the plurality of absorbent pads via a second sensor; sensing the user no longer on the plurality of absorbent pads via the second sensor; and placing the cover back on the pan.

In one embodiment, a footwear sanitizing system is provided comprising: a sanitizer pan; a mat positioned in the sanitizer pan; sanitizing liquid on the mat; and a mat clamping bar interconnected to the sanitizer pan.

In one embodiment, a footwear sanitizing system is provided comprising: a sanitizer pan; an absorbable mat positioned in the sanitizer pan; a heavy mat positioned on top of the absorbable mat within the sanitizer pan, wherein the heavy mat has shoe-shaped cutouts; a pump housing interconnected to the sanitizer pan, the pump housing comprising a photoelectric eye and a nozzle; a pump positioned within the pump housing; a control box interconnected to the pump; and a fluid container interconnected to the pump, wherein the fluid container contains sanitizing solution.

Unless otherwise indicated, all numbers expressing quantities, dimensions, conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term “about”.

“Absorb” is the incorporation of a substance in one state into another of a different state (e.g. liquids being absorbed by a solid or gases being absorbed by a liquid). Absorption is a physical or chemical phenomenon or a process in which atoms, molecules, or ions enter some bulk phase—gas, liquid or solid material. In most applications, “absorb” means to take in or soak up (energy, or a liquid or other substance) by chemical or physical action, typically gradually.

All percentages and ratios are calculated by total composition weight, unless indicated otherwise.

It should be understood that every maximum numerical limitation given throughout this disclosure is deemed to include each and every lower numerical limitation as an alternative, as if such lower numerical limitations were expressly written herein. Every minimum numerical limitation given throughout this disclosure is deemed to include each and every higher numerical limitation as an alternative, as if such higher numerical limitations were expressly written herein. Every numerical range given throughout this disclosure is deemed to include each and every narrower numerical range that falls within such broader numerical range, as if such narrower numerical ranges were all expressly written herein. By way of example, the phrase from about 2 to about 4 includes the whole number and/or integer ranges from about 2 to about 3, from about 3 to about 4 and each possible range based on real (e.g., irrational and/or rational) numbers, such as from about 2.1 to about 4.9, from about 2.1 to about 3.4, and so on.

These and other advantages will be apparent from the disclosure contained herein. The above-described embodiments, objectives, and configurations are neither complete nor exhaustive. The Summary is neither intended nor should it be construed as being representative of the full extent and scope of the present disclosure. Moreover, references made herein to “the present invention” or “the present disclosure” or aspects thereof should be understood to mean certain embodiments of the present disclosure and should not necessarily be construed as limiting all embodiments to a particular description. The present disclosure is set forth in various levels of detail in the Summary as well as in the attached drawings and the Detailed Description and no limitation as to the scope of the present disclosure is intended by either the inclusion or non-inclusion of elements, components, etc. in this Summary. Additional aspects of the present disclosure will become more readily apparent from the Detailed Description, particularly when taken together with the drawings.

The preceding is a simplified summary of the disclosure to provide an understanding of some aspects of the invention. This summary is neither an extensive nor exhaustive overview of the disclosure and its various embodiments. It is intended neither to identify key or critical elements of the invention nor to delineate the scope of the invention but to present selected concepts of the invention in a simplified form as an introduction to the more detailed description presented below. As will be appreciated, other embodiments of the invention are possible utilizing, alone or in combination, one or more of the features set forth above or described in detail below.

DETAILED DESCRIPTION

FIG.1Ais a perspective view of a closed package2of absorbent pads for the footwear sanitizing system.FIG.1Bis a side elevation view of the closed package2of absorbent pads for the footwear sanitizing system. The package2includes a sealed packaging sleeve6. The sealed packaging sleeve6encloses the absorbent pads. As mentioned above, the absorbent pads may be dry or pre-saturated. If the pads are pre-saturated, then the material of the packaging sleeve6must not permit the transmission of the sanitizing chemical such that the pads do not dry out and the edges of the packaging sleeve6must be sealed to prevent the pads from drying out.

FIG.2Ais a perspective view of an open package2of absorbent pads10for the footwear sanitizing system.FIG.2Bis a side elevation view of the open package2of absorbent pads10for the footwear sanitizing system. The sleeve6contains one absorbent pad10. In other embodiments, the packaging sleeve6contains two or more absorbent pads10.

In the embodiment shown, the pads10are rectangular shaped. However, in other embodiments the pads may have different shapes such as round, oval, circular, square, or any other shape. In some embodiments, the pads are between about 6 inches and about 24 inches wide. In a typical embodiment, the pads are between about 12 inches and about 20 inches wide. More typically, the pads are about 17.75 inches wide. In some embodiments, the pads are between about 10 inches and about 28 inches long (measured from front to rear or toe to heel). In a typical embodiment, the pads are between about 14 inches and about 22 inches long. More typically, the pads are about 20.75 inches long.

The pads can vary in thickness depending on the specific use, size, and sanitizing chemical used. For example, the pads may be between about 0.05 inch and about 1.0 inch thick. Typically, the pads are between about 0.0625 inch and about 0.5 inch thick. More typically, the pads are about 0.125 inch thick.

In some embodiments, the pads10are pre-saturated with the sanitizing solution and can be used immediately after being placed in the pan or tray. In other embodiments, the pads10are substantially dry and the user adds the sanitizing solution to the pads10once they are placed in the pan. Because the pads must hold the sanitizing solution and deposit the solution onto the soles of a user's shoes when the user steps on the pad, the pads must be absorbent. The pad may be sponge-like to permit the sanitizing liquid to move through the pad when the user steps on the pad. The pads may contain a negative charge to help attract “dipolar” water or other molecules in the sanitizing solution and absorb them. Additionally, or alternatively, the pads may be comprised of fibers that have papillary action, meaning the fibers draw or suck in the liquid sanitizer like a straw through the interior of the fiber. The liquid is then stored in the interior cell walls until it eventually dries out or evaporates.

Desired characteristics of the pad include the desired absorbency, texture, abrasive upper surface, density, weight, backing, and thickness. For example, the typical absorbency of the pad is 164 mL/ft2. A more typical absorbency of the pad is 410 mL per pad. The permeability and/or porosity of the pad can also be important as the pores/channels can also absorb and/or transport the liquid sanitizer. Thus, the number of pores/capillaries/channels per square inch and the size thereof also affects the absorption rate and qualities of the pad.

The typical texture of the pad is rough, mildly abrasive, & soft. A more typical texture of the pad is mildly abrasive. In some embodiments, it may be desirable for the upper surface of the pad (the surface that touches the sole of the user's shoes) to have an abrasive texture such that the user does not slip on the pad, to remove debris from the user's footwear, and to increase the amount and rate the sanitizer transfers to the user's shoes' soles. Alternatively, a smooth upper surface may be desired such that the user's shoes do not stick to and rip the absorbent pad. The typical abrasiveness of the upper surface of the pad is mildly abrasive.

The typical density of the pad is between light weight and medium weight, for example between about 5.0 lb/ft3and about 15.0 lb/ft3(about 80 kg/m3and about 240 kg/m3). A more typical density of the pad is a medium weight density, for example about 11.0 lb/ft3(about 176 kg/m3). The weight of the pad and material used therein can affect the amount of sanitizer solution that can be absorbed and how quickly the liquid solution spreads (wicking time (seconds) or level (measured in cm or inches)) throughout the pad. The typical weight of the pad is between about 0.1 lb and about 1.5 lb. A more typical weight of the pad is about 0.29 lb.

The absorbent pads may be comprised of multiple materials and layers. In some embodiments, the pads are comprised of felt material. In other embodiments, the pad can be comprised of cotton, polyester, cellulose, and polypropylene materials. The pads may comprise cellulose to make the pad absorbent. The pads may be comprised of natural and/or synthetic materials. Further, the pad may include gels, crystals, or beads that absorb moisture, such as Super Absorbent Polymer (SAP) or Absorbent Gel Material (AGM). Superabsorbent polymers are commonly made from the polymerization of acrylic acid blended with sodium hydroxide in the presence of an initiator to form a poly-acrylic acid sodium salt (sometimes referred to as sodium polyacrylate). This polymer is the most common type of SAP made in the world today. Other materials are also used to make a superabsorbent polymer, such as polyacrylamide copolymer, ethylene maleic anhydride copolymer, cross-linked carboxymethylcellulose, polyvinyl alcohol copolymers, cross-linked polyethylene oxide, and starch grafted copolymer of polyacrylonitrile to name a few. The latter is one of the oldest SAP forms created. Today superabsorbent polymers are made using one of three primary methods: gel polymerization, suspension polymerization, or solution polymerization.

The pads10may have multiple layers for various purposes. For example, the bottom layer of the pad10may be a non-absorbent material (e.g., plastic, other polymer, cellophane, cellulose, etc.) to keep the sanitizing solution in the pad10when the system includes a stack of pads10. Here, the sanitizing solution will stay in the upper pads in the stack of pads10rather than seeping into and staying in the bottom pad in the stack. The middle layer of the pad10may be an absorbent material for absorbing and holding the sanitizing solution. The upper layer of the pad10may be a stronger material that withstands repeatedly being stepped on by the users of the system. Thus, the upper layer is less likely to tear after a user steps onto and off of the pad. Because the upper layer is stronger, it will likely be less absorbent than the middle layer and, therefore, may have perforations to permit the sanitizing solution to move from the middle layer to the soles of the user's shoes. The upper layer may also be smooth to reduce the amount it sticks to the user's shoes and, thus, minimize tearing. Alternatively, the upper layer may have an abrasive surface to permit more sanitizing solution to adhere to the user's shoes.

FIG.3is a perspective view of the footwear sanitizing system20without a cover.FIG.3Ais an enlarged view of a portion ofFIG.3.FIG.3Bis a cross-sectional view of the footwear sanitizing system20taken at line B-B ofFIG.3. The footwear sanitizing system20includes a pan26to hold the absorbent pads10, and a clamping bar50.

The pan26is rectangular shaped and includes four outer sides30, a bottom34, and a cavity38formed by multiple inner sides (also called “inner sidewalls” herein)42and a bottom surface40. The bottom34may have an abrasive surface, rubber, or other coating or layer to prevent slipping on a flat, smooth floor. Alternatively, the pan26may be bolted to the floor or secured to the floor in another known manner. The four outer sides30extend upwardly from the bottom34. The inner sides42extend upwardly from the bottom surface40of the cavity. The bottom34is positioned on the floor; thus, the bottom34is substantially flat. For example, in one embodiment, the outer sides30of the pan26are positioned at an angle between about 30° and about 75° as measured from the bottom34of the pan26. In a typical embodiment, the outer sides30of the pan26are positioned at an angle between about 40° and about 60° as measured from the bottom34of the pan26. The outer sides30may be sloped (as shown) or vertical and substantially perpendicular to one another. The outer sides30terminate in a substantially flat (horizontal or angled inward) edge90. The upper edge90is positioned between and connects the outer sides30and the inner sides42. The pan26has a cavity38for holding the pads10. The inner sides42and bottom surface40form the cavity38and the inner sides42may be substantially vertical (as shown) or may slope inward or outward. Here, the inner sides42are substantially straight to align with the substantially straight sides of the pads10. Alternatively, the inner sides42may be curved or another shape to match the shape of the pads10. The cavity38may be approximately the same shape and size of the pads10for securely holding the pads10. The bottom surface40of the cavity38is substantially flat and substantially parallel to the bottom34of the pan26.

The pan26may be composed of a metal material, plastic material, composite material, acrylic material, ceramic material, glass, glass-like material, or other sturdy material that does not absorb moisture and prevents the transmission or evaporation of liquid and that does not react with the sanitizing chemical. Thus, any material can be used, but preferred characteristics of the pan material include strength (the material should be strong and not break or fracture if kicked or stepped on), little to no absorption of liquid (the liquid in the pads should stay in the pads and not be soaked up by the pan), limit the transmission of the liquid out of the pan (to prevent and limit evaporation of the sanitizing chemical), and not degrade due to constant contact with the sanitizing chemical.

The pan26may also have a liner, film, or coating along the cavity38(including the bottom40of the cavity and the inner sidewalls42) to protect the pan26from the chemicals used in the sanitizing solution, i.e., to prevent the pan26from degrading or reacting with the chemicals used in the sanitizing solution.

In one embodiment, the system20includes a first clamping bar50positioned at the front70of the pan26and a second clamping bar50at the rear74of the pan26. The clamping bar50may be a spring-loaded bar54. The user uses a tool62(e.g., screw driver) to push on an end of the bar54to express the spring of the clamping bar50and lift the bar54. In other embodiments, the clamping bar50may not have a spring and rather may be raised and lowered by screwing or unscrewing a screw in one or both ends of the bar54or the center of the bar54. In still other embodiments, the clamping bar50may not have a spring or screw to raise and lower the bar54. Rather, the bar may be heavy and keep the pads10in place using its weight and a serrated edge58.

The bar54may have a serrated edge or an edge with teeth58that interacts with and is positioned adjacent to the pad10. The serrations or teeth58assist the bar54in gripping and holding the pads10. Other embodiments may have more or fewer clamping bars50or other securing mechanisms. The purpose of the clamping bar50is to hold the pad10in place as the user steps onto and off of the pad10. When the upper pad needs to be removed or new pads10put into the pan26, then the user opens or loosens the clamping bar50or other securing mechanism to permit the removal and replacement of the pads10.

As shown inFIG.3B, the pan26can hold one or more pads10. For example, two or more pads10may be placed in the pan26. The user steps onto the top pad10. As the top pad10wears out, gets dirty, or dries out, the user (or operator) can remove the top pad10. Then the system continues to function as the users now step on the second pad, which is now the top pad10, to sanitize the soles of their shoes. As discussed above, if six pads10are needed per day, then the six pads10may be placed in the pan26at the beginning of the day. As the day progresses, the operator removes the top pad10. By the end of the day, all of the pads10should be gone and the operator will refill the pan26with a new pack of six pads.

FIG.4Ais a perspective view of the footwear sanitizing system22with a cover82.FIG.4Bis a side elevation view of the footwear sanitizing system22with a cover82.FIG.5is a perspective view of the footwear sanitizing system22with the cover82removed. The cover82can be placed on the pan26after each use, nightly, or between shifts depending on the frequency of use of the system22. The cover82may be optional and provided for the pan26for longer gaps between uses in order to prevent the pads10from drying out. Because a quick-drying sanitizing chemical is used, the pads10will dry out quicker than with slow-drying sanitizing agents. Thus, the cover82slows the drying-out process. The cover82is likely the same material as the pan26, but the cover82can be a different material in some embodiments. The cover should reduce the amount of liquid sanitizer evaporating from the pan26and pads10. Thus, the cover82should be comprised of a non-porous material that inhibits the transmission of moisture or blocks moisture from evaporating from the pads and into the environment. Further, the cover82is likely comprised of a non-absorbent material, like the pan26.

The cover82may be flat (i.e., have a substantially flat upper surface and substantially flat lower surface with a perimeter edge94) and have a handle82. The user can remove the cover82using the handle86. The cover82is sized and shaped to fit on or in the pan26. In the embodiment shown, the cover86sits on a portion of the upper edge90of the pan26. The cover82may be sized such that it sits on and covers the entire upper edge90. Alternatively, the cover82may be slightly smaller than the outer perimeter of the upper edge90and, therefore, sit on only a portion of the upper edge90. In some embodiments, the cover82(outer perimeter of the cover) is smaller than the inner perimeter of the upper edge90such that the cover82sits in the pan26within the upper edge90. The cover82may sit directly on the pads10or sit on the clamping bar50. In some embodiments, the upper edge90is angled slightly inward and the cover82sits on a lower/inner portion of the upper edge90. In other embodiments, the cover82may be larger (have a larger outer perimeter) than the upper edge90. Thus, a portion of the cover82would protrude over the outer perimeter of the upper edge90. In some embodiments, the cover82has downward-oriented sidewalls positioned around the perimeter edge94of the cover82. The downward-oriented sidewalls may be substantially perpendicular to the upper surface of the cover82or the downward-oriented sidewalls may be angled to correspond to the angle of the outer sides30. The cover82may have a rubber trim around the perimeter edge94, around the perimeter of the bottom surface of the cover82, or along the underside of the angled sidewalls to assist the cover82in securely engaging the pan26and to limit the amount of moisture that can evaporate from the pads10.

In some embodiments, the under or bottom surface of the cover82may have a liner, film, or coating (similar to one embodiment of the pan26) to protect the cover82from the chemicals used in the sanitizing solution, i.e., to prevent the cover from degrading or reacting with the chemicals used in the sanitizing solution.

In some embodiments (not shown), the cover is two or more pieces that slide apart and slide together to cover the pan. For example, the cover may be two pieces of the same or different sizes that slide together to cover the pan. Thus, the cover or cover pieces may be positioned on a track to assist in sliding on and off the pan. If the cover is two pieces, then the two pieces will meet at a seam. The pieces may interconnect with one another at the seam through the use of rubber trim, a tongue and groove connection, a friction fit, snaps, one piece overlapping the other piece a predetermined distance, or any other known interconnection means. In some embodiments, the edge of at least one piece at the seam has a rubber trim to assist in engaging the edge of the second piece and to limit the gap through which moisture can escape from the pan.

The cover82may be operated manually by the user, i.e., by lifting the cover82using the handle86. The cover82may be manually slid along tracks by the user, which is possible if the cover82is one piece (as shown) or two or more pieces. Alternatively, the cover82may be automatically operated. For example, the system can include sensors to sense a user approaching and then a motor moves the cover82off of the pan26. The motor may slide the cover (or cover pieces if the cover is comprised of two or more pieces) along tracks and off of the pan26. The cover or cover pieces may be moved to open and close the system22using a track and pulley system. An embodiment of the system22with the automatic cover82may also include a button the user can press to retract or move the cover82in case the sensor(s) does not function properly and the cover82does not open when the user approaches the footwear sanitizing system22.

Examples of the various sensors may include, but are in no way limited to, motion sensors, weight or pressure sensors, audio sensors, photoelectric sensors, broken beam sensors, thermal sensors, a ranging and imaging system (e.g., LIDAR, etc.), LIDAR (Light Imaging, Detection, And Ranging) systems, an imaging sensor (e.g., camera, IR, etc.), cameras (e.g., independent, stereo, combined image, etc.), infrared (IR) sensors, a radio object-detection and ranging system sensors (e.g., RADAR, RF, etc.), RADAR sensors (e.g., object-detection sensors and/or systems), radio frequency (RF) sensors, ultrasonic sensors (e.g., transducers, transceivers, etc.), and other ranging, imaging, and/or object-detecting sensors. In some embodiments, the sensors and systems may be disposed in and around one or more portions of a footwear sanitizing system22(e.g., the surrounding floor, vertically in front of the system, attached to a handwashing station, above the system22, on a ceiling, on a wall, on or in a sidewall30of the pan26, on an upper surface of the cover82, etc.). In some embodiments, the sensors may be used to monitor and/or detect a position of persons near, or proximal to, the system22.

The sensor(s) used to detect an approaching user may be a photoelectric sensor, or photo eye, which is an equipment used to discover the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver. There are three different useful types: opposed (through beam), retro-reflective, and proximity-sensing (diffused). A self-contained photoelectric sensor contains the optics, along with the electronics. It requires only a power source.

Remote photoelectric sensors used for remote sensing contain only the optical components of a sensor. The circuitry for power input, amplification, and output switching are located elsewhere, typically in a control panel. This allows the sensor, itself, to be very small. Also, the controls for the sensor are more accessible, since they may be bigger.

The sensor may have a through beam arrangement, which consists of a receiver located within the line-of-sight of the transmitter. In this mode, an object is detected when the light beam is blocked from getting to the receiver from the transmitter. A retroreflective arrangement places the transmitter and receiver at the same location and uses a reflector to bounce the inverted light beam back from the transmitter to the receiver. An object is sensed when the beam is interrupted and fails to reach the receiver. Alternatively, the system may use a proximity-sensing (diffused) arrangement where the transmitted radiation must reflect off the object in order to reach the receiver. In this mode, an object is detected when the receiver sees the transmitted source rather than when it fails to see it. As in retro-reflective sensors, diffuse sensor emitters and receivers are located in the same housing. But the target acts as the reflector, so that detection of light is reflected off the disturbance object. The emitter sends out a beam of light (most often a pulsed infrared, visible red, or laser) that diffuses in all directions, filling a detection area. The target then enters the area and deflects part of the beam back to the receiver. Detection occurs and output is turned on or off when sufficient light falls on the receiver. Some photo eyes have two different operational types, light operate and dark operate. Light operate photo eyes become operational when the receiver “receives” the transmitter signal. Dark operate photo eyes become operational when the receiver “does not receive” the transmitter signal. The detecting range of a photoelectric sensor is its “field of view,” or the maximum distance from which the sensor can retrieve information, minus the minimum distance. A minimum detectable object is the smallest object the sensor can detect.

The system22may also include infrared (IR) break-beam sensors, which are a simple way to detect motion. They work by having an emitter side that sends out a beam of IR light and a receiver side with a receiver across the way that is sensitive to the IR light. If that ray has been interrupted, the cover will be removed from the system22and the system22will open for use.

The infrared (IR) sensors may include one or more components configured to detect image information associated with an environment of the system22. The IR sensors may be configured to detect targets in low-light, dark, or poorly-lit environments. The IR sensors may include an IR light emitting element (e.g., IR light emitting diode (LED), etc.) and an IR photodiode. In some embodiments, the IR photodiode may be configured to detect returned IR light at or about the same wavelength to that emitted by the IR light emitting element. In some embodiments, the IR sensors may include at least one processor configured to interpret the returned IR light and determine locational properties of targets. The IR sensors may be configured to detect and/or measure a temperature associated with a person or object approaching the system22. Examples of IR sensors as described herein may include, but are not limited to, at least one of Opto Diode lead-salt IR array sensors, Opto Diode OD-850 Near-IR LED sensors, Opto Diode SA/SHA727 steady state IR emitters and IR detectors, FLIR® LS microbolometer sensors, FLIR® TacFLIR 380-HD InSb MWIR FPA and HD MWIR thermal sensors, FLIR® VOx 640×480 pixel detector sensors, Delphi IR sensors, other industry-equivalent IR sensors and/or systems, and may perform IR visual target and/or obstacle detection in an environment around the system22using any known or future-developed standard and/or architecture.

The LIDAR sensor may include one or more components configured to measure distances to targets using laser illumination. In some embodiments, the LIDAR sensor may provide 3D imaging data of an environment around the system22. The imaging data may be processed to generate a full 360-degree view of the environment around the system22. The LIDAR sensor may include a laser light generator configured to generate a plurality of target illumination laser beams (e.g., laser light channels). In some embodiments, this plurality of laser beams may be aimed at, or directed to, a rotating reflective surface (e.g., a mirror) and guided outwardly from the LIDAR sensor into a measurement environment. The rotating reflective surface may be configured to continually rotate 360 degrees about an axis, such that the plurality of laser beams is directed in a full 360-degree range around the system22. A photodiode receiver of the LIDAR sensor may detect when light from the plurality of laser beams emitted into the measurement environment returns (e.g., reflected echo) to the LIDAR sensor. The LIDAR sensor may calculate, based on a time associated with the emission of light to the detected return of light, a distance from the system22to the illuminated target. In some embodiments, the LIDAR sensor may generate over 1.0 million points per second and have an effective operational range of at least 10 meters. Examples of the LIDAR sensor as described herein may include, but are not limited to, at least one of Velodyne® LiDAR™ HDL-64E 64-channel LIDAR sensors, Velodyne® LiDAR™ HDL-32E 32-channel LIDAR sensors, Velodyne® LiDAR™ PUCK™ VLP-16 16-channel LIDAR sensors, Leica Geosystems Pegasus:Two mobile sensor platform, Garmin® LIDAR-Lite v3 measurement sensor, Quanergy M8 LiDAR sensors, Quanergy S3 solid state LiDAR sensor, LeddarTech® LeddarVU compact solid state fixed-beam LIDAR sensors, other industry-equivalent LIDAR sensors and/or systems, and may perform illuminated target and/or obstacle detection in an environment around the system22using any known or future-developed standard and/or architecture.

The RADAR sensors may include one or more radio components that are configured to detect persons in an environment of the system22. In some embodiments, the RADAR sensors may determine a distance, position, and/or movement vector (e.g., angle, speed, etc.) associated with the person over time. The RADAR sensors may include a transmitter configured to generate and emit electromagnetic waves (e.g., radio, microwaves, etc.) and a receiver configured to detect returned electromagnetic waves. In some embodiments, the RADAR sensors may include at least one processor configured to interpret the returned electromagnetic waves and determine locational properties of targets. Examples of the RADAR sensors as described herein may include, but are not limited to, at least one of Infineon RASIC™ RTN7735PL transmitter and RRN7745PL/46PL receiver sensors, Autoliv ASP Vehicle RADAR sensors, Delphi L2C0051TR 77 GHz ESR Electronically Scanning Radar sensors, Fujitsu Ten Ltd. Automotive Compact 77 GHz 3D Electronic Scan Millimeter Wave Radar sensors, other industry-equivalent RADAR sensors and/or systems, and may perform radio target and/or obstacle detection in an environment around the system22using any known or future-developed standard and/or architecture.

The ultrasonic sensors may include one or more components that are configured to detect objects/targets in an environment of the system22. In some embodiments, the ultrasonic sensors may determine a distance, position, and/or movement vector (e.g., angle, speed, etc.) associated with a target over time. The ultrasonic sensors may include an ultrasonic transmitter and receiver, or transceiver, configured to generate and emit ultrasound waves and interpret returned echoes of those waves. In some embodiments, the ultrasonic sensors may include at least one processor configured to interpret the returned ultrasonic waves and determine locational properties of targets. Examples of the ultrasonic sensors as described herein may include, but are not limited to, at least one of Texas Instruments TIDA-00151 automotive ultrasonic sensor interface IC sensors, MaxBotix® MB8450 ultrasonic proximity sensor, MaxBotix® ParkSonar™-EZ ultrasonic proximity sensors, Murata Electronics MA40H1S-R open-structure ultrasonic sensors, Murata Electronics MA40S4R/S open-structure ultrasonic sensors, Murata Electronics MA58MF14-7N waterproof ultrasonic sensors, other industry-equivalent ultrasonic sensors and/or systems, and may perform ultrasonic target and/or obstacle detection in an environment around the system22using any known or future-developed standard and/or architecture.

The motion sensors may detect motion and/or movement of persons approaching or near the system22. Optionally, the motion sensors may be used alone or in combination to detect movement. For example, a user may walk near the system22but not approach the system22because he/she does not intend to use the system22to sanitize his/her shoes. The sensors should be calibrated or programmed to tell the difference between intended users of the system and passersby and respond accordingly.

Weight sensors may be employed to collect data relating to users approaching the system22. In some cases, the weight sensors may be included in the floor proximate a system22. Alternatively, the system22may also include a mat near the system and the mat has one or more weight sensors embedded therein. The mat may be interconnected to the pan and positioned at the rear of the pan such that the user steps on the mat before stepping on the pad in the system22. The system22may also have weight sensors under the pan26or in the pan26under the pads10such that the system22knows when the user is no longer standing on the pad10in the pan26.

The system22may include audio sensors configured to receive audio input from a user of the system22. The audio input from a user may correspond to voice commands. For example, as the user approaches the footwear sanitizing system22, the user can say, “Open,” which causes the system22to move the cover82off of the pan26. Audio sensors321may include, but are not limited to, microphones and other types of acoustic-to-electric transducers or sensors. Optionally, the audio sensors may be configured to receive and convert sound waves into an equivalent analog or digital signal. The audio sensors may determine one or more locations associated with various sounds from a user. The location of the sounds may be determined based on a comparison of volume levels, intensity, and the like. For example, the system22may be configured only respond to voice commands that are of a certain volume or determined to be a certain distance from the system22such that the system does not respond to conversations by people a certain distance away from the system22, who likely are not immediately intending to use the footwear sanitizing system. As can be appreciated, the number of sound receivers used in the system22may be increased (e.g., two or more than two) to increase measurement accuracy surrounding sound detection and location, or source, of the sound (e.g., via triangulation, etc.).

In some embodiments, the system22may include other sensors and/or combinations of the sensors described above. Additionally or alternatively, one or more of the sensors described above may include one or more processors configured to process and/or interpret signals detected by the one or more sensors. In some embodiments, the processing of at least some sensor information provided by the sensors may be processed by at least one sensor processor. Raw and/or processed sensor data may be stored in a sensor data memory storage medium. In some embodiments, the sensor data memory may store instructions used by the sensor processor for processing sensor information provided by the sensors and systems. In any event, the sensor data memory may be a disk drive, optical storage device, solid-state storage device such as a random access memory (“RAM”) and/or a read-only memory (“ROM”), which can be programmable, flash-updateable, and/or the like.

Each sensor may include an operational detection range and operational detection angle. The operational detection range may define the effective detection limit, or distance, of the sensor. In some cases, this effective detection limit may be defined as a distance from a portion of the sensor (e.g., a lens, sensing surface, etc.) to a point in space offset from the sensor. The effective detection limit may define a distance, beyond which, the sensing capabilities of the sensor deteriorate, fail to work, or are unreliable. In some embodiments, the effective detection limit may define a distance, within which, the sensing capabilities of the sensor are able to provide accurate and/or reliable detection information. The operational detection angle may define at least one angle of a span, or between horizontal and/or vertical limits, of a sensor. As can be appreciated, the operational detection limit and the operational detection angle of a sensor together may define the effective detection zone (e.g., the effective detection area, and/or volume, etc.) of a sensor.

Sensor data and information (also referred to as a “sensor signal” herein) may be collected by one or more sensors. This information may be processed (e.g., via a processor, computer-vision system, etc.) to determine targets (e.g., people) inside one or more detection zones associated with the system22.

The system22with an automatic cover may also include communication system with one or more sensors, sensor processors, sensor data memory, cover control system, communications subsystem, control data, computing devices, display devices, and other components that may be associated with the system22. These associated components may be electrically and/or communicatively coupled to one another via at least one bus. In some embodiments, the one or more associated components may send and/or receive signals across a communication network to a control source or some other entity.

The cover control system may receive processed sensor information from the sensor processor and determine to control an aspect of the system22, e.g., the cover. Controlling an aspect of the system22may include sending commands to one or more computing devices associated with the system22. In this example, the control system may receive sensor data describing an environment surrounding the system22and, based on the sensor data received, determine to adjust the cover82, lighting surrounding the system22, and sanitizing solution amount present in the pad10.

FIG.6is an exploded view of the footwear sanitizing system20without a cover. The system20is shown with seven pads10, two clamping bars50, and a pan26. In the embodiment shown, the pan26includes four outer sidewalls30extending upwardly from the bottom of the pan26and forming a pan perimeter. The pan26has a substantially flat bottom surface40of the cavity38, where the bottom surface40is substantially parallel to the bottom of the pan26. Four inner sidewalls42extend upwardly from the bottom surface40of the cavity38and form a cavity perimeter of the cavity38. The pan26has an upper edge90positioned between and interconnecting the four inner sidewalls42to the four outer sidewalls30and the cavity perimeter is substantially concentric with the pan perimeter.

FIG.7is a perspective view of the footwear sanitizing system20with dry pads10and sanitizing solution104being added to the pads10. The sanitizing solution104is poured onto the pads10from a container100. In one embodiment, the sanitizing solution104is ready to use and does not need to be diluted with water. In other embodiments, the sanitizing solution104is concentrated and must be diluted with water or alcohol.

FIG.8is a perspective view of the footwear sanitizing system20with shoes108positioned on the pad10of the system20. The user steps into the pan26and onto the pad10such that the bottom (soles) of the user's shoes108are positioned on the upper surface of the pad10. The sanitizing solution is transferred from the pad10to the soles of the user's shoes108.

FIG.9is a flowchart showing the installation process for installing the pre-saturated pads into the pan. With the packet of pads in the sanitizing pan, open one end of the packet and slide the pads into the pan200. Pour the remaining fluid from the packaging on to the pads204. Place a screwdriver in the hole of the first spring-loaded clamping bar and push towards the outside of the pan to open the clamp208. Slide the pad or pads under the clamping bar212and move the screwdriver back to the center of the pan to close the clamp and lock the pads in place216. Insert the screwdriver in the hole of the second spring-loaded clamping bar and push towards the outside of the pan to open the clamp220. Slide the pad or pads under the clamping bar224and move the screwdriver back to the center of the pan to close the clamp and lock the pads in place228. The pads are now installed in the sanitizing pan and ready for use232.

FIG.10is a flowchart showing the installation process for installing the dry pads into the pan. With the packet of pads in the sanitizing pan, open one end of the packet and slide the pads into the pan300. Place a screwdriver in the hole of the first spring-loaded clamping bar and push towards the outside of the pan to open the clamp304. Slide the pad or pads under the clamping bar308and move the screwdriver back to the center of the pan to close the clamp and lock the pads in place312. Insert the screwdriver in the clamping bar hole of the second spring-loaded clamping bar (which may be on the opposite end of the pan) and push towards the outside of the pan to open the clamp316. Slide the pad or pads under the clamping bar320and move the screwdriver back to the center of the pan to close the clamp and lock the pads in place324. Use the appropriate size bottle of sanitizing solution/chemical based on the number of pads in the sanitizing pan. For example, use 11.5 oz for one pad, 23 oz for two pads, 34.5 oz for three pads, 46 oz for four pads, 57.5 oz for five pads, and 69 oz for six pads. Pour the appropriate amount of sanitizing solution into the middle of the pads328, allowing it to absorb through all the layers. The pads are now installed in the sanitizing pan and ready for use332. Additional sanitizing chemical can be added to the absorbent pads if the pads are not worn out. Worn out or dried out pads can simply be removed and discarded.

FIG.11is a flowchart showing the method of using the footwear sanitizing system. Once the absorbent pads are installed in the sanitizing pan400, the user simply steps into the sanitizing pan and onto the saturated pad404. The user stands in place for 1-2 seconds408to allow the sanitizing chemical to wet the footwear. The user then steps out of the pan412and walks away. The remaining sanitizing chemical that is deposited from the shoe to the floor will evaporate quickly416leaving little to no moisture on the floor. When the system is not in use, the cover can be placed over the top of the pan420to reduce the evaporation rate of the sanitizing fluid.

FIG.12is a flowchart showing the method of using a footwear sanitizing system with an automatic cover. The method begins with the absorbent pads installed in the sanitizing pan and the cover positioned on the pan500. A user approaches the system504. A sensor detects the approaching person508. Any sensor can be used, as discussed above. The sensor sends the sensor data to a processor. The processor sends a signal to the cover opening mechanism to open the system by removing the cover512. The cover opening mechanism removes the cover from the pan516. The user steps onto the pad in the pan520and the sanitizing chemical is deposited onto the soles of the user's shoes. The user steps out of the pan and walks away524. A sensor (which may be the same sensor or a different sensor than the first sensor that detected the person approaching) detects the user is no longer standing on the pad in the pan and sends a signal to the processor528. The processor sends a signal to the cover opening mechanism to close the system and the cover opening mechanism moves the cover back onto the pan532.

RegardingFIG.13, an alternative embodiment of a footwear sanitizing system24is shown. The footwear sanitizing system24comprises a pan126holding a plurality of mats110,114, a handrail150, a pump housing154interconnected to a sanitizing solution container166via a fluid line170, and a control box174having a power chord178and interconnected to the pump housing154via a control line182.

Typically, the pan126is placed directly on the floor. However, the pan126can be placed in any desired location, including on a mat or other surface. The pan126may be shaped similar to the pan (item26) described above withFIGS.1-8. Alternatively, the pan126may be shaped differently. For example, the pan126may be oval-shaped, square, a rounded rectangle, or any other preferred shape. In the embodiment shown, the mats110,114are rectangular shaped and fit in the rectangular-shaped pan126. However, in other embodiments the mats110,114may have different shapes such as round, oval, circular, square, or any other shape. In some embodiments, the mats110,114are between about 10 inches and about 25 inches wide. In a typical embodiment, the mats110,114are between about 14 inches and about 20 inches wide. More typically, the mats110,114are about 17.75 inches wide. In some embodiments, the mats110,114are between about 10 inches and about 30 inches long (measured from front to rear or toe to heel). In a typical embodiment, the mats110,114are between about 16 inches and about 25 inches long. More typically, the mats110,114are about 20.75 inches long.

In some embodiments, the system comprises two or more mats110,114. The first mat114is the top mat, which can be a heavy mat with cutouts122for the shoe area. The second mat (or middle mat)110can be the absorbent mat110with the sanitizing chemical and the mat on which the user actually stands. The second mat110is positioned below the first mat114. The third mat is optional (not shown inFIG.13, seeFIG.15) and is positioned below the second mat110.

The second mat110is made of a resilient absorbent material that allows the sprayed sanitizing chemical146to quickly absorb and disperse across the mat110. The absorbent mat110can be replaced as it wears from use. Alternatively, the absorbent mat110may be a disposable mat as described above in connection with the alternative embodiment (system20or22). Because the absorbent second mat110must hold the sanitizing solution and deposit the solution onto the soles of a user's shoes when the user steps on the absorbent second mat110, the absorbent second mat110must be absorbent. The absorbent second mat110may be sponge-like to permit the sanitizing liquid to move through the absorbent second mat110when the user steps on the mat. The absorbent second mat110may contain a negative charge to help attract “dipolar” water or other molecules in the sanitizing solution and absorb them. Additionally or alternatively, the absorbent second mat110may be comprised of fibers that have papillary action, meaning the fibers draw or suck in the liquid sanitizer like a straw through the interior of the fiber. The liquid is then stored in the interior cell walls until it eventually dries out or evaporates. The absorbent second mat110may be the same material or a similar material and have the same properties or similar properties as the pads discussed above in connection withFIGS.1-8.

Regarding the first mat114, the cutouts122may be shoe-shaped, oval-shaped, rectangular, or any other shape. Alternatively, the top mat114may have one cutout for both feet rather than two cutouts122(one for each foot). These cutouts122form the shoe area and give the user a specific place to stand where the sanitizing chemical146has been sprayed. Alternatively, the cutouts can be smaller than the shoe(s) or foot of the user. In this configuration, plural cutouts are employed for each shoe of the user to ensure that ample sanitizing solution is dispensed on the shoe. The cutouts122also keep the sanitizing chemical concentrated within the shoe area because the weight of the first mat114pushes on the absorbent second mat110and prevents or limits sanitizing solution from spreading into the portion of the second mat110directly below the top mat114. Further, the top mat114is also heavy enough to function as a mechanical retainer and keep the absorbent mat110positioned in place. The top mat110can be any material, but may be rubber, metal, ceramic, plastic, glass, or any other material.

In some embodiments, the cutouts122are between about 2.0 inches and about 7.0 inches wide. In a typical embodiment, the cutouts122are between about 3.0 inches and about 6.0 inches wide. More typically, the cutouts122are about 4.0 inches wide. In some embodiments, the cutouts122are between about 8.0 inches and about 20.0 inches long. In a typical embodiment, the cutouts122are between about 12.0 inches and about 18.0 inches long. More typically, the cutouts122are about 16.0 inches long.

In some embodiments, the second mat has a greater liquid absorbency, permeability, and/or porosity than the first mat. In other words, the second mat can retain a greater volume of liquid than the first mat. For example, the second mat can absorb at least about 50% more liquid (per mat volume or in total for the mat) than the first mat. In some embodiments, the second mat can absorb at least about 60% more liquid (per mat volume or in total for the mat) than the first mat. Typically, the second mat can absorb at least about 75% more liquid (per mat volume or in total for the mat) than the first mat. More typically, the second mat can absorb at least about 85% more liquid (per mat volume or in total for the mat) than the first mat. The amount of liquid absorbed is measured by volume or weight of the liquid absorbed.

In some embodiments, the first mat has a greater weight, rigidity, and/or density than the second mat. This ensures that liquid absorbed by the second mat is pushed towards the cutouts, thereby ensuring greater cleaning and sanitizing of the user's footwear and minimizing wasted sanitizing solution. For example, the first mat is at least about 50% heavier (by weight) than the second mat. In some embodiments, the first mat is at least about 75% heavier (by weight) than the second mat. Typically, the first mat is at least about 100% heavier (by weight) than the second mat. Typically, the first mat is at least about 3 times heavier (by weight) than the second mat. More typically, the first mat is at least about 5 times heavier (by weight) than the second mat, meaning that the first mat weighs about 5 times the weight of the second mat. Additionally, in some embodiments, the first mat is at least about 50% more dense than the second mat. Typically, the first mat is at least about twice as dense (i.e., two times as dense) as the second mat. Typically, the first mat is at least about 3 times as dense as the second mat. More typically, the first mat is at least about 5 times as dense as the second mat. Moreover, in some embodiments, the first mat is at least twice as rigid as the second mat. Typically, the first mat is at least 3 times as rigid as the second mat.

In the embodiment shown, a pump housing154is interconnected to or positioned proximate the front70of the system24or front70of the pan126. The pump housing154comprises the pump for spraying the sanitizing solution146onto the mat110. The pump draws sanitizing solution from the sanitizing solution container166via the fluid line170. The pump is controlled by the control box174and is in communication with the control box174via a control line182. The control box174draws power from a power source via the power chord178. The control box174may also supply power to the pump via the control line182. The control box174may comprise a prime button to prime the system24by spraying sanitizing solution while the prime button is pressed, a solution capacitive sensor to detect solution, and a solution empty indicator light to indicate when the sanitizing solution container166is empty.

A handrail150may be interconnected to the pan126or the floor and is provided for the safety and comfort of the users. A user can hold onto the handrail150as he/she steps into and out of the pan126.

FIG.14is perspective view of a portion of the footwear sanitizing system24. The system comprises a pan126for holding two or more mats110,114. Here the top mat114has rectangular cutouts rather than shoe-shaped cutouts122. The pan126has outer sides130, inner sides (also called “inner sidewalls” herein)142, and an upper edge190positioned between and interconnecting the outer sides130and inner sides142.

The pump housing154is interconnected to or positioned proximate the pan126. The pump housing154comprises the pump for spraying the sanitizing solution146onto the mat110. The pump draws sanitizing solution from the sanitizing solution container166via the fluid line170and sprays the sanitizing solution146out of the pump housing154and onto the absorbent mat110via one or more nozzles162. The nozzles162may be stainless steel or any other material. The pump is in communication with the control box and receives power via a control line182. The pump housing154also comprises a sensor158to sense an approaching user. The sensor158can be any sensor, including those described above in connection withFIGS.4A,4B, and5. In one embodiment, the sensor158is a photoelectric eye. After the sensor158senses an approaching user, the pump will spray sanitizing solution146onto at least a portion of the shoe areas122. In some embodiments, the sanitizing solution146is sprayed in a flat, longitudinal pattern at least a portion of the length of a cutout122, i.e., the shoe area. The sanitizing solution then spreads out across the width of the shoe area122via wicking and absorption. In alternative embodiments, the nozzles162rotate to spray the flat, longitudinal spray pattern146across the width of the cutouts or shoe areas122. In other embodiments, the system comprises more than one nozzle162per cutout122such that two or more straight, flat streams are sprayed onto each cutout122. In a typical embodiment, the pump housing comprises three nozzles162per cutout122and each nozzle162sprays a straight stream146onto the absorbent mat110within the cutout122. Each stream146is sprayed about 1 inch apart from the other stream146. In another embodiment, the pump housing154comprises one nozzle162per cutout122and the nozzle162sprays one straight stream146, then rotates or slides to the left or right and sprays a second straight stream146about 1 inch away from the first stream146, and then rotates or slides again to spray a third straight stream about 1 inch away from the second stream146. In still another embodiment, the nozzles162may spray a jet-like stream onto a single point on the absorbent mat110. Then the sanitizing solution spreads out on the absorbent mat110to cover a majority or all of the shoe area122. In additional embodiments, the nozzles spraying the jet-like streams may rotate or move to spray the jet-like streams onto multiple different points within the shoe area122. Still further, the system may have multiple nozzles spraying jet-like streams on multiple different points of each shoe area122.

The system24has multiple independent electronic controls that control the sensor158, solution pump, prime button, solution empty indicator light, and solution capacitive sensor. To add additional sanitizing chemical to the mat110, a user can press a prime button on the control panel, and sanitizing chemical will be sprayed onto the mat110until the button is released. If the sanitizing solution container166is empty, a red indicator light on the control panel will light up. To replace the sanitizing solution, the user will replace the sanitizing solution container166with a new container and press and hold the prime button until the red indicator is no longer illuminated and the sanitizing solution is spraying146from the nozzles162.

FIG.15is a cross-sectional view of the footwear sanitizing system taken at line15-15ofFIG.14. In the embodiment shown, the pan126is rectangular shaped and includes four outer sides130, a bottom134, and a cavity138formed by multiple inner sides142and a bottom surface140. The bottom134may have an abrasive surface, rubber, or other coating or layer to prevent slipping on a flat, smooth floor. Alternatively, the pan126may be bolted to the floor or secured to the floor in another known manner. The four outer sides130extend upwardly from the bottom134. The inner sides142extend upwardly from the bottom surface140of the cavity. The bottom134is positioned on the floor; thus, the bottom134is substantially flat. For example, in one embodiment, the outer sides130of the pan126are positioned at an angle between about 30° and about 75° as measured from the bottom134of the pan126. In a typical embodiment, the outer sides130of the pan126are positioned at an angle between about 40° and about 60° as measured from the bottom134of the pan126. The outer sides130may be sloped (as shown) or vertical and substantially perpendicular to one another. The outer sides130terminate in a substantially flat (horizontal or angled inward) edge190. The upper edge190may be curved, substantially flat, substantially horizontal, or angled in other embodiments. The upper edge190is positioned between and connects the outer sides130and the inner sides142. The pan126has a cavity138for holding the mats110,114,118. The inner sides142and bottom surface140form the cavity138and the inner sides142may be substantially vertical (as shown) or may slope inward or outward. Here, the inner sides142are substantially straight to align with the substantially straight sides of the mats110,114,118. Alternatively, the inner sides142may be curved or another shape to match the shape of the mats110,114,118. The cavity138may be approximately the same shape and size of the mats110,114,118for securely holding the mats110,114,118. The bottom surface140of the cavity138is substantially flat and substantially parallel to the bottom134of the pan126.

The pan126may be composed of a metal material, plastic material, composite material, acrylic material, ceramic material, glass, glass-like material, or other sturdy material that does not absorb moisture and prevents the transmission or evaporation of liquid and that does not react with the sanitizing chemical. Thus, any material can be used, but preferred characteristics of the pan material include strength (the material should be strong and not break or fracture if kicked or stepped on), little to no absorption of liquid (the liquid in the pads should stay in the pads and not be soaked up by the pan), limit the transmission of the liquid out of the pan (to prevent and limit evaporation of the sanitizing chemical), and not degrade due to constant contact with the sanitizing chemical.

The pan126may also have a liner, film, or coating along the cavity138(including the bottom140of the cavity and the inner sidewalls142) to protect the pan126from the chemicals used in the sanitizing solution, i.e., to prevent the pan126from degrading or reacting with the chemicals used in the sanitizing solution.

The three mats110,114,118are clearly shown inFIG.15. The top mat114has cutouts122forming the shoe areas. The absorbent second mat110is positioned below the top mat114. The third mat118is positioned below the second mat110. The third mat is for cushion and variations in conforming to various sole tread patterns. In some embodiments, the third mat118is a bubble mat. A domed rubber mat that allows for cushion and variation in conforming to various sole tread patterns.

The mats110,114,118can vary in thickness depending on the specific use, size, and sanitizing chemical used. For example, the top mat114may be between about 0.0625 inch and about 1.5 inch thick. Typically, the top mat114is between about 0.125 inch and about 1.0 inch thick. More typically, the top mat114is about 0.5 inch thick. The absorbent second mat110may be between about 0.05 inch and about 1.0 inch thick. Typically, the absorbent second mat110is between about 0.0625 inch and about 0.5 inch thick. More typically, the absorbent second mat110is about 0.125 inch thick. The third mat118may be between about 0.125 inch and about 1.0 inch thick. Typically, the third mat118is between about 0.25 inch and about 0.75 inch thick. More typically, the third mat118is about 0.375 inch thick.

Desired characteristics of the top mat114include the desired absorbency, texture, density, weight, flexibility, traction, and durability. For example, typically the top mat114is non-absorbent. Typically the top mat114has a smooth texture.

The typical density of the top mat114is between about 25 lb/ft3and about 490 lb/ft3. A more typical density of the top mat114is about 69 lb/ft3. The typical weight of the top mat114is between about 0.5 lb and about 6.0 lb. A more typical weight of the top mat114is about 1.69 lb.

Desired characteristics of the absorbent second mat110include the desired absorbency, texture, abrasive upper surface, density, weight, backing, and thickness. For example, the typical absorbency of the absorbent second mat110is between about 100 mL/ft2and about 250 mL/ft2. A more typical absorbency of the absorbent second mat110is about 164 mL/ft2. A more typical absorbency of the absorbent second mat110is about 410 mL per pad. The porosity of the absorbent second mat110is also important as the pores/channels can also absorb and/or transport the liquid sanitizer. Thus, the number of pores/capillaries/channels per square inch and the size thereof also affects the absorption rate and qualities of the absorbent second mat110.

The typical texture of the absorbent second mat110is mildly abrasive. In some embodiments, it may be desirable for the upper surface of the absorbent second mat110(the surface that touches the sole of the user's shoes) to have an abrasive texture such that the user does not slip on the mat and to increase the amount and rate the sanitizer transfers to the user's shoe soles. Alternatively, a smooth upper surface may be desired such that the user's shoes do not stick to and rip the absorbent second mat110. The typical abrasiveness of the upper surface of the absorbent second mat110is fibrous.

The typical density of the absorbent second mat110is between light weight and medium weight, for example between about 5.0 lb/ft3and about 15.0 lb/ft3(about 80 kg/m3and about 240 kg/m3). A more typical density of the absorbent second mat110is a medium weight density, for example about 11.0 lb/ft3(about 176 kg/m3).

The weight of the absorbent second mat110and material used therein can affect the amount of sanitizer solution that can be absorbed and how quickly the liquid solution spreads (wicking time (seconds) or level (measured in cm or inches)) throughout the absorbent second mat110. The typical weight of the absorbent second mat110is about 0.10 lb and about 1.5. A more typical weight of the absorbent second mat110is 0.29 lb.

The absorbent mats may be comprised of multiple materials and layers. In some embodiments, the absorbent second mat110is comprised of felt material. In other embodiments, the absorbent second mat110can be comprised of cotton, polyester, cellulose, polypropylene, and other durable materials. The absorbent second mat110may comprise cellulose to make the mat absorbent. The absorbent second mat110may be comprised of natural and/or synthetic materials. Further, the absorbent second mat110may include gels, crystals, or beads that absorb moisture, such as Super Absorbent Polymer (SAP) or Absorbent Gel Material (AGM).

Desired characteristics of the third mat118include the desired absorbency, density, weight, flexibility, traction, and durability. For example, typically the third mat118is non-absorbent.

The typical density of the third mat118is between about 25 lb/ft3and about 150 lb/ft3. A more typical density of the third mat118is between about 50 lb/ft3and about 100 lb/ft3. A more typical density of the third mat118is about 69 lb/ft3. The typical weight of the third mat118is between about 1.0 lb and 6.0 lb. A more typical weight of the third mat118is about 4.0 lb.

The third mat118may be comprised of multiple materials and layers. In some embodiments, the third mat118is comprised of a rubber material. In other embodiments, the third mat118can be comprised of rubber, nylon, silicone, EPDM, Neoprene, and/or other materials. The third mat118may comprise cellulose to make the mat absorbent. The third mat118may be comprised of natural and/or synthetic materials. Further, the third mat118may include gels, crystals, or beads that absorb moisture, such as Super Absorbent Polymer (SAP) or Absorbent Gel Material (AGM).

FIG.16is a perspective view of a footwear sanitizing system24interconnected to an automatic handwashing station190. The footwear sanitizing system24is sized and shaped to interconnect to an automatic handwashing station190. Thus, the user can wash her hands at the same time her footwear is sanitized.

The embodiments shown inFIGS.13-16may also include a cover similar to the cover shown and described withFIGS.4A-5. The cover may be manually operated or automatically operated as described above.

RegardingFIG.17, as a user approaches the system600, a sensor (e.g., a photoelectric eye) will sense the user once he is a few feet (e.g., approximately 2-3 feet) from the system604. The internal solution pump will turn on, consuming sanitizing solution from the container of solution608, and the system will spray the sanitizing solution through two nozzles directly onto the mat within the two shoe-shaped or rectangular areas612. In one embodiment, the system will spray for approximately 0.5 seconds to 3.0 seconds and will use between about 2.0 mL and about 8.0 mL of sanitizing solution, depending on the exact chemical used and the requirements of the system, which are determined by the operator or user. If additional sanitizer is needed, press and hold the prime button until the desired mat saturation level is reached. In some embodiments, the sanitizing solution is sprayed in a flat, longitudinal pattern the length of a cutout area, i.e., the shoe area. In other embodiments, the sanitizing solution is sprayed in jet-like streams onto the absorbent mat. The user then simply steps into the pan in the cutouts (i.e., shoe areas)616while holding the handrail for safety and stands in place for 1-2 seconds to allow the sanitizing chemical to wet the soles of his footwear620. The user then steps out of the pan and walks away. The remaining sanitizing chemical that is deposited from the shoes to the floor will evaporate quickly leaving little to no moisture on the floor.

The initial setup for the footwear sanitizing system comprises the following steps: place the pan in the desired location, e.g., in front of an automated handwasher; route the ⅜″ tube with the quick connector from the stand under the handwasher and attach it to the pan manifold; and place the three mats into the pan, ensuring that they are in the correct order from bottom to top: black bubble mat, grey absorptive mat (with soft side up), red foot placement mat (with grip knobs upward). Place the sanitizer solution container into the basket attached to the stand; connect the pickup tube cap to the sanitizer bottle, and connect the yellow cable coming out the back of the handwasher to the electrical connection on the front of the stand. Power is now connected to the system, and the red “Footwear Solution Empty” light should illuminate. Press and hold the prime button for approximately 30 seconds or until the desired mat saturation level is reached. The “Footwear Solution Empty” light should now be off, and the system is ready for use.

To clean and maintain the pan and mats, drain and clean the pan at least once per day when is use. If excessive pooling occurs in the pan, or if the mat becomes regularly undersaturated during use, adjust the sanitizer dispensation. To clean the system remove mats from the pan and clean the mats by hosing them down to remove soil. Let the mats air dry. Clean and sanitize the pan completely, including the underside of the pan. Once the mats are dry and the pan is clean, re-install the mats. Put the base mat (which may be black) in the pan first, then put the absorbent felt mat in the pan, and last put the heavy mat with cutouts (which may be red) in the pan on top of the absorbent mat. Follow the instructions for initial startup to refill the system.

In various embodiments, the sanitizing chemical is a mixture of isopropyl alcohol and quaternary ammoniums. In some embodiments, the absorbent pads and absorbent mats consist of mostly isopropyl alcohol. The sanitizing solution may also include water in addition to the alcohol and ammonium. In one embodiment, the percentage of isopropyl alcohol in the solution is between about 30% and about 70%. Typically, the percentage of isopropyl alcohol in the solution is between about 40% and about 60%. More typically, the percentage of isopropyl alcohol in the solution is about 50%. In some embodiments, the percentage of quaternary ammoniums (also called “quats”) in the solution is between about 0.001% and about 5%. More typically, the percentage of quaternary ammoniums in the solution is about 0.01%. In some embodiments, the percentage of dimethlbenzyl ammonium chloride in the solution is between about 0.001% and about 1.0%. Typically, the percentage of dimethlbenzyl ammonium chloride in the solution is about 0.01%. In some embodiments, the percentage of dimethyl ethylbenzyl ammonium chlorides in the solution is between about 0.001% and about 1.0%. Typically, the percentage of dimethyl ethylbenzyl ammonium chlorides in the solution is about 0.01%. In some embodiments, the percentage of the other ingredients (including water) in the solution is between about 25% and about 75%. Typically, the percentage of the other ingredients (including water) in the solution is between about 40% and about 60%. More typically, the percentage of the other ingredients (including water) in the solution is about 49.9%.

Rubbing alcohol, hand sanitizer, and disinfecting pads typically contain a 60-70% solution of isopropyl alcohol in water. Water is required to open up membrane pores of bacteria, which acts as a gateway for isopropyl alcohol. A 75% v/v solution in water may be used as a hand sanitizer. Isopropyl alcohol is used as a water-drying aid. Isopropyl alcohol dissolves a wide range of non-polar compounds. It also evaporates quickly, leaves nearly zero oil traces, compared to ethanol, and is relatively non-toxic, compared to alternative solvents. Isopropyl alcohol is miscible in water, ethanol, ether, and chloroform. It will dissolve ethyl cellulose, polyvinyl butyral, many oils, alkaloids, gums and natural resins. Isopropyl alcohol is not miscible with salt solutions and can be separated from aqueous solutions by adding a salt such as sodium chloride.

Quaternary ammonium cations, also known as quats, are typically positively charged polyatomic ions of the structure NR+4, R being an alkyl group or an aryl group. Unlike the ammonium ion (NH+4) and the primary, secondary, or tertiary ammonium cations, the quaternary ammonium cations are typically permanently charged, independent of the pH of their solution. Quaternary ammonium salts or quaternary ammonium compounds (called quaternary amines in oilfield parlance) are typical salts of quaternary ammonium cations.

Quaternary ammonium salts are used as disinfectants, surfactants, fabric softeners, and as antistatic agents (e.g., in shampoos). Quaternary ammonium compounds have also been shown to have antimicrobial activity. Certain quaternary ammonium compounds, especially those containing long alkyl chains, are used as antimicrobials and disinfectants. Examples are benzalkonium chloride, benzethonium chloride, methylbenzethonium chloride, cetalkonium chloride, cetylpyridinium chloride, cetrimonium, cetrimide, dofanium chloride, tetraethylammonium bromide, didecyldimethylammonium chloride and domiphen bromide. Also good against fungi, amoebas, and enveloped viruses, quaternary ammonium compounds are believed to act by disrupting the cell membrane. Quaternary ammonium compounds are lethal to a wide variety of organisms except endospores, Mycobacterium tuberculosis, and non-enveloped viruses.

The sanitizing solution can be added to the pads or mats at room temperature. Alternatively, the sanitizing solution can be heated and added to the mats or pads at some temperature above room temperature.

The sanitizing solution is removed from the user's shoes via both physical motion (i.e., being shaken off of the user's shoes) and volatility (i.e., evaporating). In some embodiment, at least about 50% of the sanitizing solution will volatize within about 5 seconds from the user's shoes after the user steps out of the sanitizing pan and off of the sanitizing pad or mat. In some embodiment, at least about 50% of the sanitizing solution will volatize within about 3 seconds from the user's shoes after the user steps out of the sanitizing pan and off of the sanitizing pad or mat. In some embodiment, at least about 50% of the sanitizing solution will volatize within about 2 seconds from the user's shoes after the user steps out of the sanitizing pan and off of the sanitizing pad or mat. In some embodiment, at least about 50% of the sanitizing solution will volatize within about 1 second from the user's shoes after the user steps out of the sanitizing pan and off of the sanitizing pad or mat. In some embodiment, at least about 75% of the sanitizing solution will volatize within about 5 seconds from the user's shoes after the user steps out of the sanitizing pan and off of the sanitizing pad or mat. In some embodiment, at least about 75% of the sanitizing solution will volatize within about 3 seconds from the user's shoes after the user steps out of the sanitizing pan and off of the sanitizing pad or mat.

In some embodiment, at least about 50% of the sanitizing solution will volatize within about 5 seconds, when deposited on the floor from the user's shoes. In some embodiment, at least about 50% of the sanitizing solution will volatize within about 3 seconds, when deposited on the floor from the user's shoes. In some embodiment, at least about 50% of the sanitizing solution will volatize within about 2 seconds, when deposited on the floor from the user's shoes. In some embodiment, at least about 50% of the sanitizing solution will volatize within about 1 second, when deposited on the floor from the user's shoes. In some embodiment, at least about 75% of the sanitizing solution will volatize within about 5 seconds, when deposited on the floor from the user's shoes. In some embodiment, at least about 75% of the sanitizing solution will volatize within about 3 seconds, when deposited on the floor from the user's shoes.

In some embodiments, the sanitizing solution has a vapor pressure of at least about 5 mm Hg at 0° C. Typically, the sanitizing solution has a vapor pressure of at least about 7.5 mm Hg at 0° C. More typically, the sanitizing solution has a vapor pressure of at least about 10 mm Hg at 0° C.

Any portions of the embodiments shown inFIGS.1-8can be used in combination with or as alternatives to any portions of the embodiments shown inFIGS.13-16, and vice versa. The features of one embodiment can be used with features of other embodiments. Additionally, the methods ofFIGS.9-12can be used when any embodiment described herein.

While various embodiments of the present invention have been described in detail, it is apparent that modifications and alterations of those embodiments will occur to those skilled in the art. However, it is to be expressly understood that such modifications and alterations are within the scope and spirit of the present invention, as set forth in the following claims. Further, the invention(s) described herein is capable of other embodiments and of being practiced or of being carried out in various ways. It is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.

A number of variations and modifications of the invention can be used. It would be possible to provide for some features of the invention without providing others. The present invention, in various embodiments, configurations, or aspects, includes components, methods, processes, systems and/or apparatus substantially as depicted and described herein, including various embodiments, configurations, aspects, subcombinations, and subsets thereof. Those of skill in the art will understand how to make and use the present invention after understanding the present disclosure. The present invention, in various embodiments, configurations, and aspects, includes providing devices and processes in the absence of items not depicted and/or described herein or in various embodiments, configurations, or aspects hereof, including in the absence of such items as may have been used in previous devices or processes, e.g., for improving performance, achieving ease and/or reducing cost of implementation.