Abstract:
A container for preserving the freshness of a stored food product is disclosed. The container has a receptacle with a piston and seal arrangement that creates a variable volume for food storage. A vent and seal arrangement allows for the removal of air as the piston is moved within the receptacle to reduce the volume within. A removable engaging member pushes the piston upward in order to reduce the inner volume of the container as the food stored in the container is consumed. This reduction in space and associated removal of air inhibit the oxidation and spoilage of many popular foods such as guacamole. With the engaging member removed, the container is also useful for serving the stored food product.

Description:
CROSS REFERENCE TO RELATED PATENT APPLICATIONS 
       [0001]    This application is a Continuation-in-Part of U.S. patent application Ser. No. 15/247,573 filed Aug. 25, 2016 entitled “Stay-Fresh Food Container” by Sharon Lonner et al., which is a continuation of U.S. patent application Ser. No. 14/514,903 filed Oct. 15, 2014 entitled “Stay-Fresh Food Container”, which claims priority to U.S. Provisional Patent Application Ser. No. 61/906,056 filed on Nov. 19, 2013 the entire disclosures of which are incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    This invention relates generally to food storage containers, and more particularly to a container with a variable inner volume for preserving freshness of an easily oxidized food while also providing for storage and serving functionality. 
         [0004]    2. Description of Related Art 
         [0005]    Not all food products that are made or purchased are consumed immediately. This necessitates a suitable storage device for the food product surplus. In addition, many in the culinary arts or simply those that create food products require a suitable storage device to preserve their creations. Modern storage devices are often bowls, canisters, boxes, and variously sized and shaped containers. Many of these containers have lids to enclose the created food product to prevent spills and spoilage. While such storage devices are perfectly suited to many food products, the air contained within these storage devices during use can contribute to faster degradation and spoilage of the food product stored within. Many food products that are vegetable or fruit based, or even meat based, will not only dry out when exposed to air, they will also discolor and break down, making the food product less desirable or even inedible. An example of such a food product that degrades rapidly in the presence of air is guacamole, an avocado based spread or dip that has become very popular in recent years, and is well suited for accompanying chips and Mexican dishes, often being served with corn chips of various shapes and recipes. Guacamole is notorious for turning an unpleasant brown color at the surface when exposed to air. if the prepared guacamole is stored in many of the food storage containers that are readily available today, the entrapped air in the food storage container quickly results in discoloration and breakdown of the guacamole that in turn results in spoilage and waste. This problem of food degradation is often caused by rapid oxidation of various components of the food product. Large commercial food processors will often use vacuum packaging or nitrogen packaging to provide longer shelf life for their products. While such systems work well, they are typically expensive and not very applicable to a home kitchen environment. In addition, they are not well suited to many food products such as dips or spreads. 
         [0006]    What is therefore needed is a container that preserves the freshness of an easily oxidized food product, is easy to use and cost effective. It is thus an object of the present invention to provide a container that preserves the freshness of an easily oxidized food. 
         [0007]    These and other objects of the present invention are not to be considered comprehensive or exhaustive, but rather, exemplary of objects that may be ascertained after reading this specification and claims with the accompanying drawings. 
       BRIEF SUMMARY OF THE INVENTION 
       [0008]    In accordance with the present invention, there is provided a container for preserving the freshness of a stored food product, the container comprising a generally cylindrical receptacle having a first open end, an opposing second open end and an Inner diameter, a piston having an upper surface and an exterior diameter that is slightly less than the interior diameter of the generally cylindrical receptacle to allow for placement of the piston within the generally cylindrical receptacle to form a food storage chamber of variable volume; a lower surface of the piston defined by a cylindrical recess; an upper support surface that covers the piston; a peripheral wiper seal that creates a generally air and liquid tight seal between the exterior diameter of the piston and the interior diameter of the generally cylindrical receptacle; a generally cylindrical engaging member having an exterior diameter that is less than the interior diameter of the generally cylindrical receptacle and a coupling with a diameter that is less than the external diameter of the generally cylindrical engaging member and with the coupling capable of engaging within the cylindrical recess of the lower surface of the piston to allow for movement of the piston in the generally cylindrical receptacle in order to vary the volume of the formed food storage chamber, a lid that is removably securable to the first open end of the generally cylindrical receptacle; and a vent located on the lid. 
         [0009]    The foregoing paragraph has been provided by way of introduction, and is not intended to limit the scope of the invention as described in this specification, claims and the attached drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]    The invention will be described by reference to the following drawings, in which like numerals refer to like elements, and in which: 
           [0011]      FIG. 1  is a perspective view of a freshness preserving food container of the present invention with a removable engaging member in place; 
           [0012]      FIG. 2  is a perspective view of the freshness preserving food container with the engaging member removed; 
           [0013]      FIG. 3  is a perspective view of the freshness preserving food container of the present invention with the engaging member compressing the food storage volume; 
           [0014]      FIG. 4  is a perspective view of the freshness preserving food container of the present invention with the food storage volume compressed and the engaging member removed; 
           [0015]      FIG. 5  is an exploded view of the freshness preserving food container, 
           [0016]      FIG. 6  is a top plan view of the freshness preserving food container; 
           [0017]      FIG. 7  is a bottom plan view of the freshness preserving food container, 
           [0018]      FIG. 8  is a side plan view of the freshness preserving food container; 
           [0019]      FIG. 9  is a cross sectional view of the freshness preserving food container taken along line B-B of  FIG. 8 . 
           [0020]      FIG. 10  is a perspective view of the piston of the freshness preserving food container; 
           [0021]      FIG. 11  is a top plan view of the piston of the freshness preserving food container; 
           [0022]      FIG. 12  is a side plan view of the piston of the freshness preserving food container; 
           [0023]      FIG. 13  is a cross sectional view of the piston of the freshness preserving food container taken along line C-C of  FIG. 12 ; 
           [0024]      FIG. 14  is a bottom plan view of the piston of the freshness preserving food container; 
           [0025]      FIG. 15  is a perspective view of the upper support surface and seals of the freshness preserving food container; 
           [0026]      FIG. 16  is a top plan view of the upper support surface and seals of the freshness preserving food container; 
           [0027]      FIG. 17  is a side plan view of the upper support surface and seals of the freshness preserving food container; 
           [0028]      FIG. 18  is a bottom plan view of the upper support surface and seals of the freshness preserving food container; 
           [0029]      FIG. 19  is a perspective view of the cylindrical receptacle of the freshness preserving food container; 
           [0030]      FIG. 20  is a top plan view of the cylindrical receptacle of the freshness preserving food container; 
           [0031]      FIG. 21  is a side view of the cylindrical receptacle of the freshness preserving food container; 
           [0032]      FIG. 22  is a cross-sectional view of the cylindrical receptacle of the freshness preserving food container taken along line D-D of  FIG. 21 ; 
           [0033]      FIG. 23  is a bottom plan view of the cylindrical receptacle of the freshness preserving food container; 
           [0034]      FIG. 24  is a perspective view of the engaging member of the freshness preserving food container; 
           [0035]      FIG. 25  is a bottom plan view of the engaging member of the freshness preserving food container; 
           [0036]      FIG. 26  is a side plan view of the engaging member of the freshness preserving food container; 
           [0037]      FIG. 27  is a cross-sectional view of the engaging member of the freshness preserving food container taken along line E-E of  FIG. 26 ; 
           [0038]      FIG. 28  is a top plan view of the engaging member of the freshness preserving food container; 
           [0039]      FIG. 29  is a perspective view of the lid of the freshness preserving food container; 
           [0040]      FIG. 30  is a top plan view of the lid of the freshness preserving food container; 
           [0041]      FIG. 31  is a side plan view of the lid of the freshness preserving food container; 
           [0042]      FIG. 32  is a bottom plan view of the lid of the freshness preserving food container; 
           [0043]      FIG. 33  is a perspective view of a latch of the freshness preserving food container; 
           [0044]      FIG. 34  is a top plan view of a latch of the freshness preserving food container; 
           [0045]      FIG. 35  is a bottom plan view of a latch of the freshness preserving food container; 
           [0046]      FIG. 36  is a side view of a latch of the freshness preserving food container; 
           [0047]      FIG. 37  is a perspective view of the lever cap of the freshness preserving food container; 
           [0048]      FIG. 38  is a top plan view of the lever cap of the freshness preserving food container; 
           [0049]      FIG. 39  is an end view of the lever cap of the freshness preserving food container; 
           [0050]      FIG. 40  is a side plan view of the lever cap of the freshness preserving food container; 
           [0051]      FIG. 41  is a bottom plan view of the lever cap of the freshness preserving food container; 
           [0052]      FIG. 42  is a perspective view of the sealing plug of the freshness preserving food container; 
           [0053]      FIG. 43  is a side plan view of the sealing plug of the freshness preserving food container; 
           [0054]      FIG. 44  is a bottom plan view of the sealing plug of the freshness preserving food container; 
           [0055]      FIG. 45  is a cross-sectional view of the sealing plug of the freshness preserving food container taken along line F-F of  FIG. 44 ; 
           [0056]      FIG. 46  is a perspective view of the annular sealing ring of the freshness preserving food container; and 
           [0057]      FIG. 47  is a plan view of the annular sealing ring of the freshness preserving food container. 
       
    
    
       [0058]    The attached figures depict various views of the present invention in sufficient detail to allow one skilled in the art to make and use the present invention. These figures are exemplary, and depict a preferred embodiment; however, it will be understood that there is no intent to limit the invention to the embodiment depicted herein. On the contrary, the intent is to cover all alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by this specification, claims and drawings. 
       DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0059]    A Freshness Preserving Food Container is described and depicted by way of this specification and the attached drawings. 
         [0060]    For a general understanding of the present invention, reference is made to the drawings. In the drawings, like reference numerals have been used throughout to designate identical elements. 
         [0061]    The present invention and the various embodiments described and depicted herein, provides, among other things, a novel device for extending the storage life of a food product, to providing a variable volume food storage and serving container that reduces or eliminates the oxidation of many food products that makes them aesthetically undesirable or inedible. 
         [0062]    It should first be noted that the freshness preserving food container may preferably be made from any plastic suitable for food storage, but may also be made from glass, stainless steel, ceramic, or the like. Plastics should be FDA grade, and may include, for example, polypropylene. The various components of the freshness preserving food container may be made by injection molding, blow molding, casting, 3D printing, extruding, forming, machining, and the like. 
         [0063]      FIGS. 1-4  show perspective views of the freshness preserving food container. Taken collectively, these figures also depict the various in-use states of the freshness preserving food container to also allow one to fully appreciate how to use the present invention. 
         [0064]      FIG. 1  is a perspective view of the freshness preserving food container  100  with a removable engaging member  113  in place. One can see the piston  103  in a downward position, allowing for maximum volume within the freshness preserving food container  100 . 
         [0065]    The freshness preserving food container  100  has essentially a moveable bottom in the form of a piston  103  and related upper support surface  105  and peripheral wiper seals  107  and  109 . A generally cylindrical receptacle  101  forms the walls of the container  100  and has a rust open end, an opposing second open end and an inner diameter. The first open end is the end that is generally upward when in use, and retains the lid  117 . The generally cylindrical receptacle may, in some embodiments of the present invention, be made from a clear plastic or clear polymer such as a copolyester to allow viewing of the food product within the container  100 . Viewing of the food product allows the user to determine if the inner volume of the container  100  has been reduced sufficiently to remove any remaining airspace within the container  100  that could cause degradation of the stored food product. It should be noted that the figures provided herein are depicted with a clear cylindrical receptacle, and the inner components such as the piston  103 , engaging member  113 , and upper support surface  105  are clearly visible as a result. 
         [0066]    Forming the bottom of the freshness preserving food container  100  is a piston  103  having an upper surface and an exterior diameter that is slightly less than the interior diameter of the generally cylindrical receptacle to allow for placement of the piston  103  within the generally cylindrical receptacle  101  to form a food storage chamber of variable volume. The piston  103 , as later described, has a lower surface or underside that is defined by a cylindrical recess. This recess, which will become evident in subsequent figures, allows the engaging member  113  to couple with and evenly move the piston  103  within the cylindrical receptacle  101 . The piston  103  may be made from a plastic that is preferably food safe. Ridges  11  I may optionally be present around the periphery of the piston  103  to provide alignment of the piston  103  within the generally cylindrical receptacle. The piston  103  may also have a peripheral groove, recess, or similar feature to allow for retention of an upper support surface  105 . The upper support surface  105  covers the piston to provide not only a removable cover for cleaning purposes, but also to form seals around the periphery of the covered piston that create a generally air and liquid tight seal between the exterior diameter of the piston and the interior diameter of the generally cylindrical receptacle. In  FIG. 1  and subsequent figures, a first peripheral wiper seal  107  and a second peripheral wiper seal  109  can be seen. The upper support surface  105  and the associated wiper seals  107  and  109  are mad from a soft durometer material such as a rubber thermoplastic elastomer, or a silicone composition to conform to and cover the piston  103  and to allow the wiper seals  107  and  109  to create a moveable or slideable seal with the wall of the cylindrical receptacle  101 . The upper support surface  105  also has an inner protrusion, ridge, wall or the like that engages with a peripheral channel or groove in the piston  103  for retention thereof. 
         [0067]    Also seen in  FIG. 1  is a generally cylindrical engaging member  113  having an exterior diameter that is less than the interior diameter of the generally cylindrical receptacle  101  and a coupling (see  FIG. 5, 503 ) with a diameter that is less than the external diameter of the generally cylindrical engaging member  113  and with the coupling  503  capable of engaging within the cylindrical recess of the lower surface of the piston  103  to allow for movement of the piston  103  in the generally cylindrical receptacle  101  in order to vary the volume of the formed food storage chamber. The cylindrical engaging member  113  may also have ridges  115  for alignment of the cylindrical engaging member  113  with the cylindrical receptacle  101  such that the piston  103  receives the cylindrical engaging member  113  and is properly aligned when in use. 
         [0068]    A lid  117  can also be seen that is removably securable to the first open end of the generally cylindrical receptacle. The lid  117  may have a plurality of latches such as the first latch  119 , the second latch  121  and the third latch  123 . The latches may have a pin or other feature that engages with a feature on the lid  117  such as a socket or receiver. In  FIG. 1 , a first retention socket  125  and a second retention socket  127  can be seen that hingeably connect the latch to the lid. 
         [0069]    A vent is located on the lid  117  to allow the release of air when the piston  103  travels upward to reduce the inner volume of the freshness preserving food container  100 . The vent  513  can be seen in  FIG. 5 . In  FIG. 1 , the vent  513  is covered by a lever cap  129  that has a seal to plug the vent once the inner volume of the freshness preserving food container  100  has been reduced by movement of the piston  103 . 
         [0070]      FIG. 2  is a perspective view of the freshness preserving food container  100  with the engaging member  113  removed. The engaging member  113  can be removed when the freshness preserving food container  100  is in use. A snug but easily removable fit between the coupling of the engaging member  113  and the underside of the piston  103  allows for ease of piston travel while maintaining the alignment necessary(for the piston  103  to reduce the inner volume of the freshness preserving food container  100  without becoming skewed or otherwise misaligned within the cylindrical receptacle  101 . 
         [0071]      FIG. 3  is a perspective view of the freshness preserving food container  100  with the engaging member  113  in place and coupled with the piston  103  to compress or otherwise reduce the food storage volume through inward travel of the piston into the cylindrical receptacle  101 . 
         [0072]      FIG. 4  is a perspective view of the freshness preserving food container  100  with the food storage volume compressed or otherwise reduced and the engaging member  113  removed. This position would be typical of a situation where the food product being stored has been mostly consumed or there is only a small amount of food left in the freshness preserving food container. 
         [0073]      FIG. 5  is an exploded view of the freshness preserving food container  100 . While the way in which the various components are assembled is evident by this figure and the accompanying figures, a further description of some of the aspects of the present invention that may not have been visible in previous figures is provided. The cylindrical receptacle  101  may have a peripheral flange  501  at the rust open end of the generally cylindrical receptacle  101 . The peripheral flange  501  is an outward flare that serves to receive and properly seat the lid  117 . The lid itself may have a recess or depression around the lower periphery of the lid  117  that may also contain an annular sealing ring  517 . The annular sealing ring is a soft durometer material that serves as a gasket. The peripheral flange  501  may also serve as a retention edge for the latches  119 ,  121  and  123  to grab or otherwise engage with. 
         [0074]    The coupling  503  of the engaging member  113  can be seen clearly. The coupling  503  in one embodiment is a reduced diameter portion of the engaging member  113  with a diameter sufficient to engage with the underside or a cylindrical recess of the lower surface of the piston  103 . The coupling  503  cylindrically mates with the piston  103  in order to allow a user to push the piston  103  upward, thus reducing the inner volume of the freshness preserving food container  100 . The coupling  503 , part of the engaging member  113 , transitions from the coupling  503  to the engaging member body with a step, edge or transition that allows the coupling  503  to only be inserted a given distance into the hollow underside cylindrical recess of the piston  503 . This step or transition ensures that the engaging member  113  is inserted far enough to uniformly push the piston  103 , but not so far that the removal of the engaging member  113  from the piston  103  is difficult. An insertion of the coupling from ¼ to ½ of the overall height of the piston  103  is an example of a preferred embodiment. The coupling flange  507  also eases the insertion and removal of the engaging member  113  with the piston  103 , as the coupling flange  507  is configured radially inward to ease the diameter of the coupling flange  507  when it is first inserted into the underside of the piston  103 . Coupling ridges  505  may also be seen around the periphery of the coupling  503  to facilitate alignment and removable coupling of the engaging member  113  with the piston  103 . In some embodiments of the present invention, a coupling flange  507  may be present. The coupling flange  507  provides structural rigidity to the engaging member  113  and also softens an otherwise sharp edge. 
         [0075]    As previously disclosed, the piston  103  may also contain a groove, recess, or slot to accommodate a feature on the upper support surface  105  that serves to retain the upper support surface  105  to the piston  103 . Such a groove or recess may be bounded by a first peripheral guide  509  and a second peripheral guide  511 . 
         [0076]    A vent  513  can also be seen centered in the lid  117 . In some embodiments of the present invention, the lid  117  is outwardly convex, with the vent  513  centered at the apex. This allows a stored food product to move upward while being compressed radially inward, removing air and preventing trapped air that could otherwise occur with a flat lid. 
         [0077]    Once the piston  103  has traveled upward to reduce the inner volume of the freshness preserving food container with the vent open (lever cap  127  open), the lever cap  127  is pushed downward onto the lid  117 . A sealing plug  515  is attached to the underside of the lever cap  129  such that it engages with and seals the vent  513 . 
         [0078]      FIGS. 6-9  depict further views of the freshness preserving food container  100 .  FIG. 6  is a top plan view of the freshness preserving food container  100 . The lever cap  129  can be seen in the closed position. The lever cup  129  is hingeably connected to the lid with pins that engage with retention sockets, similar to the way in which the latches are connected to the lid. 
         [0079]      FIG. 7  is a bottom plan view of the freshness preserving food container  100 . The engaging member  113  can be seen along with the underside of the piston  103 . The engaging member  113  is a cylindrical element with no top or bottom, which allows the underside of the piston to be visible. The latches  119 ,  121  and  123  can be seen in the closed (latched) position with a curved face engaging with the peripheral flange  501  (see  FIG. 5 ). 
         [0080]      FIG. 8  is a side plan view of the freshness preserving food container. The latches can be seen in the down (closed) position, resulting in an attached and sealed lid. 
         [0081]      FIG. 9  is a cross sectional view of the freshness preserving food container taken along line B-B of  FIG. 8 . The coupling  503  of the engaging member  113  can be clearly seen engaging with the piston  103 . The outwardly convex shape of the lid  117  is also evident, along with the lever cap  129  and sealing plug arrangement that engages with and plugs the vent  513  of the lid  117 . 
         [0082]      FIG. 10  is a perspective view of the piston  103  of the freshness preserving food container  100 . The first peripheral guide  509  and the second peripheral guide  511  can be seen forming a channel to receive the upper support surface  105 , and in particular a peripheral protrusion, flange, or relief feature of the upper support surface  105 . 
         [0083]      FIG. 11  is a top plan view of the piston  103  of the freshness preserving food container  100 . The surface is generally flat to receive the upper support surface  105 , but may, in some embodiments, be convex, concave, or the like. 
         [0084]      FIG. 12  is a side plan view of the piston  103  of the freshness preserving food container  100 . A slight variation in diameter between the first peripheral guide  509  and the second peripheral guide  511  can be seen, to provide, among other things, ease of insertion of the piston  103  and attached upper support surface  105  into the cylindrical receptacle  101 . 
         [0085]      FIG. 13  is a cross sectional view of the piston  103  of the freshness preserving food container  100  taken along line C-C of  FIG. 12 . The cross hatching denotes material, showing the hollow underside that receives the engaging member  113  when in use. 
         [0086]      FIG. 14  is a bottom plan view of the piston  103  of the freshness preserving food container  101  showing the hollow cylindrical underside that receives the engaging member  113  when in use. 
         [0087]      FIG. 15  is a perspective view of the upper support surface  105  and seals  107  and  109  of the freshness preserving food container. The upper support surface covers the piston  103  (not shown) and is made from a soft durometer material such as a silicone rubber, rubber or thermoplastic elastomer. or the like. The seals  107  and  109  protrude peripherally outward and may have a slight angle or curve to facilitate ease of entry of the piston  103  into the cylindrical receptacle  101 . This also makes the piston uni-directional, allowing for ease of entry and difficult removal. In this arrangement, the peripheral wiper seals  107  and  109  are angled or curved to follow the direction of entry of the piston  103  into the cylindrical receptacle  101 . The seals prevent migration of food, liquid or solid, from the freshness preserving food container  100  to the outside environment and also prevent the unwanted entry of air into the inner volume of the freshness preserving food container  100 . 
         [0088]      FIG. 16  is a top plan view of the upper support surface  105  and seals  107  and  109  of the freshness preserving food container  100 .  FIG. 17  is a side plan view of the upper support surface  105  and seals  107  and  109  of the freshness preserving food container  100 . A slight downward curve of the seals can be seen in  FIG. 17 . While not pronounced. the peripheral wiper seals  107  and  109  become thinner toward their outer edge. When the upper support surface  105  and associated peripheral wiper seals  107  and  109  are placed on the piston  103  (see  FIG. 1 ) and installed in the cylindrical receptacle  101 , they will take on a more pronounced downward angle or curve that in turn facilitates improved sealing. This downward curve or “mushrooming” is the result of the upper support surface and seal combination being of a greater diameter than the inner diameter(s) of the cylindrical receptacle  101 . 
         [0089]      FIG. 18  is a bottom plan view of the upper support surface  105  and seals  107  and  109  of the freshness preserving food container  100 . The underside or bottom surface is recessed, hollow or otherwise concave to accommodate placement on the piston  103 . 
         [0090]      FIG. 19  is a perspective view of the cylindrical receptacle  101  of the freshness preserving food container  100 . The peripheral flange  501  can be seen protruding outwardly from the cylinder itself. The cylindrical receptacle forms the walls of the freshness preserving food container  100  with the piston  103  serving as a bottom that can vary in displacement and result in varying inner volume of the freshness preserving food container. The lid  117  is secured by cooperative engagement with the peripheral flange  501 . 
         [0091]      FIG. 20  is a top plan view of the cylindrical receptacle  101  of the freshness preserving food container  100  showing the outwardly protruding peripheral flange  501 .  FIG. 21  is a side view of the cylindrical receptacle  101  of the freshness preserving food container  100 . The peripheral flange  501  can be seen as a generally square or rectangular protrusion, in some embodiments with a slight recess on the underside, as more clearly seen in  FIG. 22 , which is a cross-sectional view of the cylindrical receptacle  101  of the freshness preserving food container  100  taken along line D-D of  FIG. 21 . 
         [0092]    It should be noted that in some preferred embodiments of the present invention, the inner diameter of the cylindrical receptacle  101  is slightly wider at the bottom than at the top. This can be seen in  FIG. 22  where the wall thickness of the cylindrical receptacle  101  is somewhat reduced toward the bottom. Such a taper or gradual variation in diameter changes the draft angle of the wiper seals interaction with the cylindrical receptacle  101 . Thus, as the piston  103  (see  FIG. 1 ) is pushed upward by the engaging member  113 , the peripheral wiper seals  107  and  109  (again, see Figure I) become tighter and more secure, preventing the stored food product from migrating outside of the formed storage area, and also preventing the piston from becoming skewed or otherwise misaligned in the cylindrical receptacle  101 . 
         [0093]      FIG. 23  is a bottom plan view of the cylindrical receptacle  101  of the freshness preserving food container  100 . The cylindrical receptacle  101  may be made from any suitable material such as a plastic. In some embodiments of the present invention. the cylindrical material is clear or opaque and is made from such a suitable material such as a clear plastic or clear polymer such as a copolyester. 
         [0094]      FIG. 24  is a perspective view of the engaging member  113  of the freshness preserving food container  100 . The engaging member  113  having been previously described as having a coupling  503  to engage with the piston  103  while the freshness preserving food container is in use. The engaging member also may have ridges  115 , which may protrude outward and have a flush interior joining surface, or the interior surface may be recessed or otherwise follow the outer contour of the ridges  115 . There may also. in some embodiments of the present invention. be coupling ridges  505  to facilitate insertion and removal of the coupling  503  of the engaging member  113 . 
         [0095]      FIG. 25  is a bottom plan view of the engaging member  113  of the freshness preserving food container  100 . The engaging member  113  in one embodiment is a cylinder of varying diameter (to create the coupling  503 ) without a top or bottom surface. 
         [0096]      FIG. 26  is a side plan view of the engaging member of the freshness preserving food container that clearly shows the coupling  503  and the step or edge created at the transition of the engaging member  113  and the coupling  503 .  FIG. 27  is a cross-sectional view of the engaging member  113  of the freshness preserving food container  100  taken along line E-E of  FIG. 26 . The structure of the coupling  503  can be clearly seen.  FIG. 28  is a top plan view of the engaging member  113  of the freshness preserving food container  100 . The various transitions in diameter to create the coupling and peripheral flange, for example, can be clearly seen. 
         [0097]      FIG. 29  is a perspective view of the lid  117  of the freshness preserving food container  100 . The retention sockets for the latches (not shown) can be seen as well as the vent  513  that is shown by example as a circular hole at the center point of the lid  117 . The lid also, in this embodiment depicted, is convex with the vent  513  at the apex or peak of the convex lid.  FIG. 30  is a top plan view of the lid  117  of the freshness preserving food container  100 . A double set of retention sockets can be seen to the left of the drawing to accommodate the lever cap  129  as well as a latch (neither are shown in  FIG. 29 , see  FIG. 1 ).  FIG. 31  is a side plan view of the lid  117  of the freshness preserving food container  100 . The convex shape of the lid  117  can be seen in this view, with the vent  513  at the apex. 
         [0098]      FIG. 32  is a bottom plan view of the lid  117  of the freshness preserving food container  100 . A channel formed by two peripheral walls can be seen around the outer perimeter of the bottom view of the lid  117 . An annular sealing ring  517  (see  FIG. 46  and  FIG. 5 ) is retained in this channel and serves to seal the lid  117  to the cylindrical receptacle  101  to provide an air and liquid tight seal. 
         [0099]      FIGS. 33-36  depict various views of the latch that is mounted to retention sockets on the lid  117  to facilitate retention and sealing of the lid  117  to the cylindrical receptacle  101 .  FIG. 33  is a perspective view of the latch of the freshness preserving food container  100 . While a first latch  119 , a second latch  121  and a third latch  123  are depicted herein, other combinations, quantities and configurations of latches are considered within the spirit and broad scope of the present invention as described, depicted and envisioned herein. The latch has a curved surface to engage with and retain the peripheral flange  501  of the cylindrical receptacle  101 . The curved surface may also have a lip or edge to facilitate engagement with the peripheral flange  501 . A roller  3305  is connected to or formed with the latch and comprises a first pin  3301  and a second pin  3303  on opposing ends. These pins engage with, and are retained by, the retention sockets on the lid, such as the first retention socket  125  and the second retention socket  127  that can be seen in  FIG. 1 . 
         [0100]      FIG. 34  is a top plan view of a latch of the freshness preserving food container  100 .  FIG. 35  is a bottom plan view of a latch of the freshness preserving food container  100 .  FIG. 36  is a side view of a latch of the freshness preserving food container  100  that shows the lip or edge on the curved surface and the overall structure of the latch necessary for engagement with the cylindrical receptacle  101  by cooperative interaction with the peripheral flange  501 . 
         [0101]    The lever cap  129  is hingeably connected to the lid  117  and serves to facilitate ease of sealing and removal of the vent plug with the vent  513  of the lid  117 .  FIG. 37  is a perspective view of the lever cap  129  of the freshness preserving food container  100 . Similar to the latches of the present invention, the lever cap  129  has a roller  3705  with a first pin  3701  at a first end of the roller  3705  and a second pin  3703  at a second end of the roller  3705 . The pins engage with retention sockets on the lid  117 , as seen and described in  FIG. 30 , for example, and as depicted in  FIGS. 1-5 . The lever cap  129  has a curve to contour with the convex surface of the lid  117 , and also a flare at the far end (non-roller end) to facilitate ease of use. 
         [0102]      FIG. 38  is a top plan view of the lever cap  129  of the freshness preserving food container  100  showing a curved and contoured end to lend both aesthetic value as well as functionality to the lever cap  129 .  FIG. 39  is an end view of the lever cap  129  of the freshness preserving food container  100 . A downward protruding sealing plug retainer can be seen, and is more clearly seen in  FIG. 41  as the sealing plug retainer  4101 .  FIG. 40  is a side plan view of the lever cap  129  of the freshness preserving food container  100  where the contour and the upwardly shaped end can be clearly seen.  FIG. 41  is a bottom plan view of the lever cap  129  of the freshness preserving food container  100 . The sealing plug retainer  4101 , a barbed or otherwise variably shaped protrusion to hold a soft durometer sealing plug  515  (see  FIG. 5  as well as  FIGS. 42-45 ). 
         [0103]      FIG. 42  is a perspective view of the sealing plug  515  of the freshness preserving food container  100 . The sealing plug  515  is configured to push on and attach to the sealing plug retainer  4101  (see  FIG. 41 ).  FIG. 43  is a side plan view of the sealing plug  515  of the freshness preserving food container  100 , showing ridges to facilitate retention and a taper to facilitate ease of placement in the vent  513 . 
         [0104]      FIG. 44  is a bottom plan view of the sealing plug  515  of the freshness preserving food container  100 .  FIG. 45  is a cross-sectional view of the sealing plug  515  of the freshness preserving food container  100  taken along line F-F of  FIG. 44 . The cavity or recess to accommodate placement on the sealing plug retainer  4101  of the lever cap  129  can be seen. 
         [0105]    To create a liquid and air tight seal of the lid  117  to the cylindrical receptacle  101 , an annular sealing ring  517  is placed in a channel that is formed on the underside of the lid. This channel is formed by two peripheral walls around the outer perimeter of the bottom view of the lid  117 , as evident by  FIG. 32 .  FIG. 46  is a perspective view of the annular sealing ring  517  of the freshness preserving food container  100 . The annular sealing ring may be a square or rectangular extrusion formed into a ring. Suitable soft durometer materials such as a rubber, silicone rubber, thermoplastic elastomer, or the like may be employed. Lastly,  Figure 47  is a plan view of the annular sealing ring  517  of the freshness preserving food container  100 . 
         [0106]    To use the freshness preserving food container  100 , a perishable food product such as guacamole is placed in the inner volume of the container with the piston  103  fully downward to create maximum inner volume of the container. The lid  117  is placed in position and latched down into place with the lever cap  129  open to allow venting. The engaging member  113  is placed within the underside of the freshness preserving food container  100  and inserted in the underside of the piston  103 . The engaging member  113  is then pushed into the cylindrical receptacle  101  such that the piston  103  travels further into the cylindrical receptacle  101 , reducing the inner volume of the freshness preserving food container  100 . The engaging member  113  continues to push the piston  103  forward until the food product reaches the top or apex of the lid  117 . Once the food product fully occupies the inner volume with no airspace, the lever cap  129  is pushed downward such that the sealing plug that is attached to the lever cap  129  engages with and is inserted into the vent  513 . The engaging member  113  can then be removed if desired, and the freshness preserving food container  100  stored in an appropriate location such as a refrigerator. When the food product is to be consumed, the lid  117  is removed. To store any remaining food product left in the container, the lid is again secured, and the air removal process is repeated to ready the container for further storage and later use. 
         [0107]    It is, therefore, apparent that there has been provided, in accordance with the various objects of the present invention, a freshness preserving food container. While the various objects of this invention have been described in conjunction with preferred embodiments thereof. it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of this specification, claims and the attached drawings.