Abstract:
The present invention is a water filter pitcher equipped with a removable, replaceable filter cartridge and means to count the number of times the pitcher is filled with water, and also means to notify the user when the pitcher has filtered enough water to exhaust the filtering capacity of the filter cartridge so that the user can replace the filter cartridge when necessary but does not have to remember to change the cartridge at a specific interval or count the number of gallons filtered manually, and instead can rely on the water filter pitcher to track the amount of water filtered and inform the user when to change the filter cartridge.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention is generally directed to a liquid filtration device typically used in residential applications or in any application where a filtered liquid is desired. The invention is more specifically directed to a water filtration device that tracks the life of the filter cartridge. The invention is designed for use as a standard water pitcher typically used in household kitchens. The invention more specifically relates to an apparatus and method used to track the number of times a water pitcher with a filter cartridge is filled with water in order to ensure that the owner is notified when the filter cartridge needs to be replaced. 
       BACKGROUND OF THE INVENTION 
       [0002]    Water is a basic necessity to sustain all life. Every living thing on the planet, animal and plant, needs water to survive. As such, the need for clean, pure water will never decrease. In fact, as populations grow, the need for clean, pure water will only increase. Recently, society has begun to focus more on the purity of water for both drinking and other applications. Pure water is bottled by a multitude of manufacturers and is sold in many places. Demand for pure bottled water is increasing and shows no signs of waning. 
         [0003]    The medical community in the United States periodically issues statements that indicate the average person does not drink enough water. Unlike soda, milk, and other beverages, water is available to most people simply by turning on a faucet. Typically, a local utility company provides water to people. The utility company is generally responsible for ensuring that the water provided to homes and businesses is clean, pure, and free from harmful organisms. Indeed, many people rely solely on the public water systems to guarantee that the water flowing into their homes and businesses is fit for consumption. Typically, the municipal body responsible for providing water to the populace will have various treatment and purification procedures to help ensure the quality of the water provided to consumers. These systems can include large, industrial scale filters, treatment tanks, and other water processing devices. Unfortunately, sometimes these systems can break down, or these systems can miss a contaminant leaving the treated water with various forms of impurities. 
         [0004]    Since water is such a vital part of people&#39;s everyday needs, the desire for clean, pure water continues to grow. Most municipal treatment facilities do an adequate job in cleaning and purifying water, however, there is concern that the municipal systems responsible for providing clean, pure water are simply overworked. Filtration of water on such a large scale can sometimes lead to water that contains particulate filtrate material left over from where the water was originally filtered. Moreover, some of the treatment methods and additive chemicals used in the cleaning and purifying of water can leave the water containing undesirable contaminants. 
         [0005]    Municipal water treatment systems typically focus on removing various contaminants from water in order to provide clean, potable water for human consumption. Large scale purification of water is designed to reduce or eliminate the concentration of particulate matter including suspended particles, parasites, bacteria, algae, viruses, and fungi. Also, the municipal treatment facilities have apparatuses and methods to remove a wide range of dissolved and particulate material picked up by water from the surfaces the water may have made contact with after falling as rain and flowing to the treatment facility. 
         [0006]    In the United States, the standards for drinking water quality are typically set by the government and have certain thresholds designed to ensure the drinking water is safe for consumption. In other countries around the world, however, the standards and thresholds for certain contaminants are not as stringent. Thus the warning of “don&#39;t drink the water,” in various places around the world. 
         [0007]    According to a 2007 World Health Organization report, 1.1 billion people lack access to an improved drinking water supply. The WHO estimates that 88% of the 4 billion annual cases of diarrheal disease are attributed to unsafe water and inadequate sanitation and hygiene. Further, 1.8 million people die from diarrheal diseases each year. The WHO further estimates that 94% of these diarrheal cases are preventable through modifications to the environment, including access to safe water. The WHO concludes that a few simple techniques for treating water at home, such as chlorination, filters, and solar disinfection, combined with storing it in safe containers could save a huge number of lives each year. 
         [0008]    In most cases, it is not possible to tell whether water is of an appropriate quality by visual examination. If water has a cloudy appearance or there are visible particles present, then the water is most likely unsafe to drink. However, many dangerous contaminants are simply too small to be visible to the naked eye. It is impossible to know that the water is clean, pure, and fit to drink simply by looking at it. Thus, some simple procedures such as boiling or the use of a household activated carbon filter have been devised in an attempt to clean and purify water for drinking. Unfortunately, these simple steps are not sufficient for treating all the possible contaminants that may be present in water from an unknown source. Even natural spring water, which in the nineteenth century was considered safe for all practical purposes, must now be tested before determining what kind of treatment, if any, is needed. A chemical analysis of water, while expensive, is the only way to obtain the information necessary for deciding on the appropriate method of purification. 
         [0009]    Thus, a need exists for a simple, easy to use device that will ensure that water is clean, pure, and does not contain harmful contaminants. More specifically, a need exists for a filter capable of residential use or small commercial use that will allow persons to be assured that any contaminants left in water after the municipal treatment of the water are removed prior to drinking. More particularly, there are growing desires from people for a water filter for use in residences that will provide clean, purified water to the homeowner. People want a device that will hold water and purify the water prior to its consumption. As such, water pitchers equipped with filters for filtering water as it is poured from the pitcher have become increasingly popular. 
         [0010]    While there are many water pitchers currently available that contain a filter, most of these pitchers are unable to provide a reliable means by which a user is notified to change the filter cartridge. As such, once the filter cartridge has been in use beyond its intended use, unless the user is continually monitoring the filter, he or she would not know to replace the cartridge. A user must manually track and or record each time the filter is used in order to know when the cartridge should be replaced. Or, a user could simply replace the filter cartridge at a particular interval of time. This is problematic, however, because different users will use water from the pitcher at different rates. Thus, there is a need for a water pitcher that will filter water and notify the user when the filter cartridge needs replacing. Currently there are a number of water pitcher filter devices known in the prior art, yet none of them meets the current need. 
         [0011]    U.S. Pat. No. 5,900,138 to Moretto discloses and teaches a water pitcher containing a filter cartridge. Moretto discloses a water pitcher with a removable lid. When the lid is removed a counter advances by one increment. At a predetermined number of increments, the user is notified that the filter cartridge is in need of replacement. However, this requires that the lid of the pitcher be removed completely from the main body of the pitcher. This is a problem because when removed from the pitcher, the filter element can be exposed to impurities on a counter, stove, or any other surface upon which it is rested. 
         [0012]    U.S. Pat. No. 4,986,901 to Nohren, Jr. et al. discloses and teaches a cap for use on water bottles. The cap contains detents corresponding to the cap body. The cap body is released and water can flow from the bottle outwardly through the cap. Each time the bottle is filled the cap is rotated one detent. The user removes the cap and fills the bottle with water. However, the user must remember to rotate the cap each time the bottle is filled with water. Once the cap is rotated to a predetermined extent, it is time to change the water filter in the bottle. Too much room for error exists, however, because if alternate people fill the bottle each must remember to rotate the cap every time. Further Nohren utilizes pressure to filter the water in the bottle. A user squeezes the bottle and the water flows through the filter and out through the cap. Since the user rotates the cap each time the bottle is used, what is actually being counted is the use of the bottle, not the volume of water filtered or the time of use of the filter cartridge. Nohren does not disclose or teach a device or method that measures volume of water filtered or time in use of the filter cartridge. 
         [0013]    U.S. Pat. No. 6,244,751 to Hoffman et al. discloses and teaches a water filter pitcher that filters water prior to use. The pitcher discloses and taught by Hoffman has an electronic circuit built into the lid that is powered by a battery. The indicator taught by Hoffman measures only elapsed time. Indeed, Hoffman specifically limits the indicator to measuring only the elapsed time, restricting it from any other signaling. The inherent problem with this device, is that it measures only time. If the water pitcher is used more than predicted, the filter cartridge will become ineffective before the set time limit. Thus, using the water pitcher until the elapsed time is reached would mean that the water is actually not being filtered properly, as the filter cartridge has expired. Also, if the filter pitcher is under used, the filter cartridge will still have useable life in it when the timer indicates that it should be replaced. Thus, counting only elapsed time to measure when the filter cartridge needs to be replaced is problematic. 
         [0014]    Therefore, a need exists for a water pitcher that will filter water and that does not suffer from the disadvantages of water pitchers according to the prior art. Indeed, a water filter pitcher is needed that will indicate to users when it is time to replace the filter cartridge by measuring the amount of water filtered. Moreover, a need exists for a water filter pitcher that does not require a user to remember to take an action each time the pitcher is filled with water. Further, a need exists for a water filter pitcher that has an easily replaceable filter and does not require the use of special tools. Further, a need exists for a water filter pitcher that can take advantage of the current available filter cartridges for ease of replacement. Moreover, a need exists for a water filter pitcher that can communicate that the filter cartridge needs replacing and is not dependant on additional actions by the user. The present invention fulfills these long-felt needs. 
       BRIEF SUMMARY OF THE INVENTION 
       [0015]    The present invention relates to water treatment devices, in particular, filter pitchers designed for use in residences or small, commercial settings. The present invention is in its most general form a liquid filtration device for the filtering of liquids. In its preferred embodiment, the present invention is designed to store and filter water in a pitcher. The present invention is generally a pitcher designed for ease of handling and pouring water. The invention includes a filter cartridge that filters the water as it is poured into the top of the pitcher. The water flows first into an upper reservoir where it then drains into a filter kit where it passes through a filter cartridge and is filtered. The filter cartridge is easily replaceable when its useful life is up, and the pitcher can be designed to fit any number of commercially available filter cartridges already on the market. Further, the pitcher is adapted to indicate to the user that the filter cartridge needs to be replaced at a particular interval. More specifically, the pitcher is adapted to count each time the pitcher is filled with water. Once the predetermined number of fillings occurs, the pitcher indicates to the user that the cartridge needs to be replaced. Thus, the pitcher itself counts the number of times it is filled with water without relying on a user to remember to take action each time the pitcher is filled. Unlike the majority of the prior art, the pitcher is configured to count the amount of water filtered, not a particular time period. 
         [0016]    A significant advantage to the new water filter pitcher is its ability to use readily available cartridges. Applicant has designed the water filter pitcher to utilize filter cartridges from Applicant&#39;s current line of replacement filter cartridges. An advantage of this is that the retailer does not have to add additional inventory items to its product line, thus limiting the number of SKU&#39;s that the retailer must carry. A still further advantage of using existing filter cartridges is the interchangeability of filter cartridges between the existing water filter pitchers and the new pitcher. The water filter pitcher can be designed and configured such that it can accommodate a wide range of commercially available filter cartridges simply by adapting the filter kit that fits inside the pitcher. 
         [0017]    More specifically, the present invention is directed to a water filter pitcher that has a lower reservoir. The lower reservoir has a pitcher top that fits on top of the lower reservoir and can be removed, if necessary. The pitcher top has an upper reservoir contained within the pitcher top. The pitcher top also has a filter housing affixed to and extending below the pitcher top&#39;s upper reservoir. The filter housing is manufactured to contain a filter kit. The pitcher top has a fill lid attached to it that opens and provides access to the interior of the pitcher top. The fill lid may open by flipping up, sliding, or otherwise moving to expose the interior of the pitcher. The fill lid is adapted to contain counting means for counting the number of times the fill lid is opened. The pitcher top may have a window through which there are means for displaying information, or the counting means may include a visable counter on the exterior of the lid such that no window is necessary to see the number of times the fill lid is opened. The information displayed and visible is generally regarding the filter cartridge and/or the number of times the fill lid has been opened to fill the pitcher. The water filter pitcher also includes a handle and a spout. 
         [0018]    The present invention is further directed to and includes a system of displaying information regarding the volume of water such as gallons, liters, etc. that has been filtered by the device. The counting means may be operated by a system of levers, ratchets, and gears. The counting means may also operate on the basis of an electrical circuit designed to track the number of times the filter top has been opened. This may be by means of a standard electrical circuit operated by a battery, or it may be by means of a magnetic field that counts the number of times a magnet is passed into and out of the field. In a simple, preferred embodiment, the counting mechanism is a system of gears that are actuated by a tension spring pressing against the fill lid and a motion trigger. When the fill lid is slid open or raised to fill the water filter pitcher with water, the gears are activated and the counter is advanced. This mechanism can include a pin on the motion trigger adapted to advance a ratchet. The ratchet is rotatably mounted inside the fill lid. The ratchet has a small gear integrally affixed to the surface of the ratchet and adapted to engage a meter disk. The meter disk contains graphic indicia such as a graphic disk that can be adapted to be visable through the pitcher top and to communicate information regarding the water filter cartridge to the user. 
         [0019]    The present invention further contemplates a counter mechanism that is mechanically or electrically engaged to a display for conveying information to the user regarding the amount of water filtered. Further, the counting mechanism is equipped with a reset, zeroing, or other device that allows the user to return the counting mechanism to its original state, i.e. zero water filtered. In an embodiment that utilizes a mechanical counting means, the reset is generally in the form of a lever or trigger that when moved rotates the counting mechanism back to the zero state through a system of gears, levers, ratchets, etc. In an embodiment utilizing an electronic circuit, the reset is generally in the form of a button or switch that when activated resets the electronic counter to the zero or initial state. Further, in an embodiment utilizing a magnetic field to count the number of times the fill lid has been opened, the reset can be in the form of a switch configured to reset the counting mechanism. Thus, a user can manually reset the counting mechanism when the filter cartridge is replaced. 
         [0020]    The invention further includes a filter kit that is comprised of a bottom housing adapted to contain a filter cartridge. The bottom housing has an opening at its base and is removably attached to a dome that fits on top of the bottom housing. The dome has openings in its surface that permit water to pass into the interior of the dome and flow downwardly through the filter kit into the filter cartridge. Once the water flows through the filter cartridge it flows out the bottom housing through the opening and into the lower reservoir. 
         [0021]    The present invention further contemplates a lower reservoir and a pitcher top removably affixed to the lower reservoir. The pitcher top includes an upper reservoir integrally formed with a filter housing adapted to contain a removable filter kit. The filter kit contains a replaceable filter cartridge. Also the pitcher top contains a fill lid adapted to contain counting means for counting the number of times the fill lid is opened. The present invention also includes means for displaying information regarding the filter cartridge and/or the number of times said fill lid is opened. 
         [0022]    The present invention is also directed to and can include an electrical circuit adapted to signal upon raising of the fill lid. The means for displaying information can be an LED, an LCD, or a light bulb. These are further contemplated to have the ability to display different colors. 
         [0023]    The present invention is further contemplated to include a system of magnets. The system of magnets operate to count the number of times the pitcher is filled with water. The fill lid of the pitcher is equipped with a magnetic field detector and the pitcher top is equipped with a corresponding magnet. When the fill lid is raised the magnet passes in and out of the magnetic field, thus activating the counting means. The counting means activated by the magnets also is connected to a reset switch whereby the user can reset the magnetic counter to the zero or initial state. 
         [0024]    The present invention further contemplates and discloses a method of providing clean, filtered water. The method includes the steps of providing a water filter pitcher. The provided water filter pitcher includes a lower reservoir and a pitcher top removably affixed to the lower reservoir. The provided water filter pitcher has a pitcher top that includes an upper reservoir integrally formed with a filter housing adapted to contain a removable filter kit, the filter kit containing a replaceable filter cartridge. The pitcher top also includes a fill lid adapted to contain counting means for counting the number of times the fill lid is opened and means for displaying information regarding the filter cartridge and/or the number of times the fill lid is opened. The provided water filter pitcher also includes a handle and a spout. The method also includes the step of opening the fill lid and pouring water into the water filter pitcher. Further, the method includes the step of replacing the replaceable filter cartridge when its life is exhausted. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         [0025]      FIG. 1  is a front plan view of the water filter pitcher according to the present invention. 
           [0026]      FIG. 2  is a front plan view of the filter kit and filter cartridge according to the present invention. 
           [0027]      FIG. 3  is an exploded view of the fill lid of the water filter pitcher according to the present invention. 
           [0028]      FIG. 4  is a bottom view of the fill lid of the water filter pitcher according to the present invention. 
           [0029]      FIG. 5  is an enlarged, partial, exploded view of the internal gearing of the water filter pitcher according to the present invention. 
           [0030]      FIG. 6  is a top view of an alternative embodiment of the water filter pitcher according to the present invention. 
           [0031]      FIG. 7  is a top view of an alternative embodiment of the water filter pitcher according to the present invention. 
           [0032]      FIG. 8  is a top view of an alternative embodiment of the water filter pitcher according to the present invention. 
           [0033]      FIG. 9  is a plan view of an alternative embodiment of the water filter pitcher according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0034]    The water filter pitcher according to the present invention solves the problems encountered in the prior art related to water pitchers. Specifically, the present invention keeps track of the amount of water filtered by the pitcher in order to indicate to the user when the filter capacity of the filter cartridge is exhausted. Thus, the user can replace the filter cartridge with a new cartridge. The water filter pitcher can be designed to utilize a replaceable filter cartridge widely available at stores. Another advantage of the present invention is that the water filter pitcher keeps track of the amount of water filtered independent from any action by the user other than normal use of the pitcher. 
         [0035]    Referring now to  FIG. 1 , there is shown a water filter pitcher  10  according to the present invention. The water filter pitcher  10  generally comprises a lower reservoir  12  for holding filtered water. The lower reservoir  12  is adapted to contain a handle  14  protruding from the lower reservoir and extending upwardly toward the top of the lower reservoir  12 . The top of the lower reservoir  12  is open and the lower reservoir  12  generally defines a pitcher. The top of the lower reservoir  12  contains attachment means  16  that are adapted to connect a pitcher top  18 . The top of the lower reservoir  12  further defines a spout  20  located on the opposite side from the handle  14 . The spout  20  aids in pouring filtered water from the water filter pitcher  10 , directing it out of the lower reservoir  12 . It should be appreciated by those skilled in the art that the lower reservoir  12  can have multiple shapes and sizes, all of which are contemplated to be within the scope of the invention. 
         [0036]    The pitcher top  18  is generally designed and adapted to fit over the top of the lower reservoir  12  so that the junction forms a liquid tight seal and will not leak. The pitcher top  18  is further adapted to fit partially over the handle  14 , which provides a secure grip upon the water filter pitcher  10  and further secures the pitcher top  18  to the lower reservoir  12 . The pitcher top  18  is equipped with tabs  22  or other attachment means that are complementary to the top attachment means  16 , integral to the lower reservoir  12 . When engaged to the top attachment means  16  on the lower reservoir  12 , the tabs  22  securely fasten the pitcher top  18  to the lower reservoir  12 . The attachment means used to affix the pitcher top  18  to the lower reservoir  12  are generally intended to be secure enough that the pitcher top  18  seems to be integral to the lower reservoir  12 . This is done because it is contemplated that the pitcher top  18  will only be removed from the lower reservoir  12  when it is time to change the filter cartridge. As such, the pitcher top  18  attaches to the lower reservoir  12  more securely than conventional water pitchers. Because the water filter pitcher  10  is designed to be refilled without removing the pitcher top  18 , the pitcher top  18  can be more securely attached to the lower reservoir  12 . This allows the water filter pitcher  10  to be of a more rigid construction, thus prolonging the life of the water filter pitcher  10 . 
         [0037]    Still referring to  FIG. 1 , the pitcher top  18  is constructed to define an opening  24  in the surface of the pitcher top  18 . The opening  24  is covered by a fill lid  26  that is designed to completely cover the opening  24  in the pitcher top  18 . The fill lid  26  can be constructed with a thumb tab  28  (shown in  FIG. 3 ) designed to assist the user in opening the fill lid  26 . The fill lid  26  is affixed to the pitcher top by conventional means, generally comprising a hinge (not shown). This allows the user to open the fill lid  26  and gain access to the interior of the water filter pitcher  10 . The fill lid  26  is designed to open and allow the user to pour water into the water filter pitcher  10 . Thus, the pitcher top  18  can be designed to have a sloping portion angling downwardly toward the opening  24  so that any water that spills on the pitcher top  18  will drain toward the opening  24 . 
         [0038]    The fill lid  26  covers the opening  24  and provides access to the interior of the water filter pitcher  10 . The pitcher top  18  is further comprised of an upper reservoir  30  that is integrally attached to the pitcher top  18 . In a preferred embodiment, the upper reservoir  30  is of unitary construction with the pitcher top  18 , thus ensuring that there is no possibility for leaks. The upper reservoir  30  is constructed to provide a filter housing  32  that will contain a water filter cartridge (not shown) that will filter water as it passes into the water filter pitcher  10  from the opening  24  and down toward the lower reservoir  12 . The forces of gravity draw the water downwardly through the filter cartridge thereby filtering the water as it passes into the lower reservoir  12 . The filter housing  32  is designed such that when a filter cartridge is placed into the filter housing  32  it is in liquid tight engagement and there is no chance for leaks that could contaminate the filtered water in the lower reservoir  12 . Once the water has passed from the upper reservoir  30  into the lower reservoir  12 , it is filtered and ready for use. 
         [0039]    Referring now to  FIG. 2 , a filter kit  34  is shown. The filter kit  34  is designed to fit into the filter housing  32  that is integral to the upper reservoir  30 . The filter kit is comprised of a bottom housing  36  adapted to contain a filter cartridge  38 , within the bottom housing  36  of the filter kit  34 . The bottom housing  36  is further manufactured to contain a hole (not shown) in the bottom of the filter kit  34  to allow filtered water to drain from the filter kit  34  into the lower reservoir  12  after it has passed through the filter cartridge  38  and been filtered. The filter kit  34  further comprises a dome  40  that is removably attached to the bottom housing  36  of the filter kit  34 . The dome  40  is fastened to the bottom housing  36  by conventional means. In a preferred embodiment, the dome  40  is threaded in order to screw onto the bottom housing  36  and provide a water tight seal. It is further contemplated that an o-ring or other part could be present to ensure a water tight seal between the dome  40  and the bottom housing  36 . Extending above and out of the top of the dome  40  is an air vent tube  42 . The air vent tube  42  is slidingly engaged to the top of dome  40  such that it can be pulled outwardly from the top of the dome  40  and pushed inwardly toward the bottom housing  36 . The air vent tube  42  is attached to the dome  40  in a water tight engagement so that no water can enter the dome  40  through the air vent tube/dome connection. 
         [0040]    In normal operation, the air vent tube  42  is retracted into the dome  40  so that it does not protrude above nor interfere with the pitcher top  18 . When the water in the lower reservoir  12  is used and it is time to replenish the water filter pitcher  10  with water, the user opens the fill lid  26  to access the interior of the water filter pitcher  10 . Once the fill lid  26  is raised, the air vent tube  42  becomes accessible to the user. The user extends the air vent tube from the dome  40 , extending it fully so that the air vent tube  42  extends above the pitcher top  18 . The air vent tube  42  is configured to allow air from the lower reservoir  12  to escape as the water from the upper reservoir  30  passes through the filter kit  34  and into the lower reservoir  12 . The user pours water through the opening  24  and into the upper reservoir  30  taking care to avoid pouring the water into the air vent tube  42 . Once the water has filled the upper reservoir  30  and is ready to pass through the dome  40  and into the filter cartridge  38 , the user presses the air vent tube  42  back into the top of the dome  40  to its normal position. 
         [0041]    The dome  40  is adapted to receive water and allow water to pass through its surface and into the filter kit  34 . The dome  40  can be configured to allow water to penetrate it in any conventional manner. In a preferred embodiment, the dome  40  is constructed with a plurality of holes in its surface of sufficient size that water may pass through. The dome  40  could also be constructed to have slits, or be in the form of a simple screen or wire mesh. It should be appreciated by those skilled in the art that the dome  40  could also be manufactured of material porous enough for water to seep through, although this is less desirable as it typically takes much longer for water to pass through a membrane or other solid material. 
         [0042]    Once the water passes through the dome  40  into the interior of the filter kit  34 , the water passes into the filter cartridge  38  where it is filtered. The filter cartridge can be of any conventional type, provided that the flow rate of water through the filter cartridge  38  is acceptable for use in a pitcher. Under the forces of gravity, the water passes through the filter cartridge  38  where impurities are removed from the water. The filter cartridge  38  may contain any number of conventional filtering media. In a preferred embodiment, the filter cartridge  38  contains activated carbon. Once the water is filtered by the filter cartridge  38 , it passes downwardly through the filter cartridge  38  and out into the lower reservoir  12 . The water is now filtered and ready for use. The filter cartridge  38  is designed to fit inside the filter kit  34  such that the filter cartridge  38  is in liquid tight contact with the bottom housing  36  of the filter kit  34 . This ensures that all water that passes into the filter kit  34  must pass through the filter cartridge before exiting into the lower reservoir  12 . This ensures that the water in the lower reservoir  12  remains filtered and is not exposed to potentially unfiltered water. 
         [0043]    According to the invention, the water filter pitcher  10  is equipped with a device to count the number of times the fill lid  26  is opened. Referring to  FIGS. 3 and 4 , the device is housed within the fill lid  26 . The fill lid  26  is manufactured to define a window  44  on the top surface of the fill lid  26 . The window  44  can be a simple opening, or it may be comprised of an opening covered by a transparent cover, so as to allow one to see below. Directly below the window  44  is a graphic disk  46 . The graphic disk  46  is marked to indicate various indicia regarding the filter cartridge. In a preferred embodiment, the graphic disk  46  is marked with numbers that correspond to the number of times the fill lid  26  is opened which in turn corresponds to the amount of water that has been filtered. The graphic disk  46  can also be marked with instructions such as “Replace Filter” or “10 Fills Remaining.” As can be appreciated by those in the art, the graphic disk  46  can be used to communicate many different types of information to the user. 
         [0044]    As seen more clearly in  FIG. 4 , on the under side of the fill lid  26 , the interior side hidden from view when the fill lid  26  is closed, there are a plurality of protruding ports  48  that are adapted to accept screws, clasps or other attachment means. In a preferred embodiment, cover screws  50  are used. Attached to the interior side of the fill lid  26  is a meter cover  52 . The meter cover  52  is shaped to define an open, rounded portion in which is fitted the counting mechanism for the water filter pitcher  10 . 
         [0045]    Directly under the thumb tab  28  on the fill lid  26  is a motion trigger  54 . The motion trigger  54  is adapted to be activated each time the fill lid  26  is opened. Thus, the motion trigger  54  is triggered when a user depresses the thumb tab  28  to open the fill lid  26  and gain access to the upper reservoir  30 . The motion trigger  54  is further adapted to form a pin  56  and a retaining post  58 . The retaining post  58  is complementary to a protrusion  60  on the interior side of the fill lid  26 . The protrusion  60  maintains the motion trigger  54  in place by accepting and securing the retaining post  58 . 
         [0046]    The motion trigger  54  further includes a spring  62  adapted for connection to the motion trigger  54  and the fill lid  26 . The spring  62 , typically a tension spring, maintains the motion trigger  54  in a stable position. When the thumb tab  28  is depressed and the fill lid  26  opens, the spring  62  is activated and presses against the motion trigger  54 . The motion trigger  54  moves, thereby moving the pin  56  that is integral to the motion trigger  54 . The pin  56  is seated in a ratchet  64 , generally in the form of a large gear, and advances the ratchet  64  by one notch. The ratchet  64  is adapted such that the pin  56  can move the ratchet  64  in one direction only, thereby advancing it one notch each time the fill lid  26  is opened. 
         [0047]    Still referring to  FIGS. 3 and 4 , and additionally referring to  FIG. 5 , it is shown that the ratchet  64  is adapted to rotate around the protrusion  60  from the fill lid  26 . Thus, the protrusion  60  acts as an axis about which the ratchet  64  rotates, securing the ratchet in place. On the surface of the ratchet  64  is a small gear  66  that is affixed to the ratchet  64 . When the motion trigger  54  is activated and engages the pin  56  that moves the ratchet  64 , the gear  66  also moves one position forward. The gear  66  engages a meter disk  68  that is also generally in the form of a gear. The meter disk  68  is secured to the fill lid  26  via a second protrusion  70  from the interior of the fill lid  26 . The second protrusion  70  acts as an axis about which the meter disk  68  rotates. The meter disk  68  supports the graphic disk  46  and causes the graphic disk  46  to rotate with the meter disk  68 . Thus, the graphic disk  46  is advanced one increment each time the fill lid  26  is opened through a series of gears. The ratchet  64  rotates in only one direction when moved via the motion trigger  54  and the pin  56 , and it is held in place by the combination of the pin  56  and the forces from the spring  62 . Thus, the graphic disk  46  cannot simply spin freely. This ensures that even if the water filter pitcher  10  is bumped or dropped, the count of the number of times the fill lid  26  has been opened is not lost. This ensures continued accuracy in the count, thus maintaining accurate measurements regarding when it is time to replace the filter cartridge  38 . 
         [0048]    The underside of the ratchet  64  is adapted to form a reset tab  72 . The reset tab  72  is configured so that a user may press against the reset tab  72  and it will rotate the ratchet  64 , and as describe above, the graphic disk  46 , back to the original setting indicating a new filter cartridge  38 . Thus, if for some reason a user decides to replace the filter cartridge  38  prior to the indication of filter cartridge exhaustion by the graphic disk  46 , the user can reset the graphic disk  46  for a full count on the new filter cartridge  38 . 
         [0049]      FIGS. 6 ,  7 , and  8  represent other variants of the device of the invention. As seen in  FIGS. 6 ,  7 , and  8 , there is provided in the fill lid  26  an electronic display  74  that can be an LED, LCD, simple light bulb, or other conventional display type. The electronic display  74  is adapted to be powered by an integral battery (not shown) that is generally of the type used for watches. Thus, the battery is small and can fit within the fill lid  26  without significantly increasing the weight of the fill lid  26 . An electrical circuit is established such that when the fill lid  26  is raised the circuit communicates with the electronic display  74 . The electronic display  74  can be programmed to display any number of messages, numbers, instructions, etc. In a preferred embodiment, the electronic display  74  includes a reset button (not shown) whereby a user can reset the electronic display  74  to its initial state upon inserting a new filter cartridge  38  into the water filter pitcher  10 . Thus the electronic display  74  serves the same function as the gearing components described earlier—it counts the number of times the fill lid  26  is opened, thus the number of times the filter cartridge  38  is used to filter water. 
         [0050]    In yet another variation of the water filter pitcher  10 , there is provided an electronic display  74  that performs as earlier described, but instead of utilizing an electrical circuit to signify when the fill lid  26  is opened, the electronic display  74  uses a tilt switch (not shown). When the fill lid  26  is opened, the tilt switch is activated and communicates to the electronic display  74  to advance the count by one. 
         [0051]    Referring now to  FIG. 9 , another embodiment of the present invention is shown. In another variation of the water filter pitcher  10 , there is a system of magnets that function to count the number of times the pitcher is filled. The fill lid  26  is equipped with a magnetic field detector  76 . The top lid is equipped with a magnet  78  such that when the magnet  78  passes the magnetic field detector  76  the count is triggered and advanced by one. This is accomplished by the use of an electrical circuit designed to detect and respond to magnetic fields. 
         [0052]    As can be seen from the foregoing description of the present invention, a new water filter pitcher has been invented. Although the present invention has been illustrated and described herein with reference to preferred embodiments and specific examples thereof, it will be readily apparent to those of ordinary skill in the art that other embodiments and examples can perform similar functions and/or achieve like results. Pitchers are available in a great variety of sizes and configurations, and filter cartridges are also available in a large variety of sizes and filtering capacities. All such equivalent embodiments and examples are within the spirit and scope of the invention and are intended to be covered by the following claims.