This disclosure relates generally to an improvement to the design of food storage vessels and containers that can also be used as cooking vessels usable in both microwave and conventional ovens.
Typical food storage containers are made from at least one of these materials: metal, glass/ceramic, thermoplastic (e.g. polypropylene (PP), polyethylene (PE)). Only glass can be used in both a microwave and conventional oven but suffers from brittleness and will shatter if dropped. Metal containers cannot be used in microwave ovens and thermoplastics cannot be used in a conventional oven. PP plastic resin is brittle in very cold temperatures, and is limited in the kinds of foods that can be cooked in a microwave without damaging the vessel from high localized heating.
Silicone is emerging as a material that is suitable for both conventional ovens, replacing metal bakeware, and for microwave ovens. It is dishwasher safe and is more resistant to staining than plastics and will not break when dropped. Silicone is also favored by users that are concerned about the health issues involved with thermoplastics and the monomers and additives like phthalates and BPA leaching into foodstuffs.
Silicone is already featured in some containers with watertight seals (replacing rubber and thermoplastic elastomers) and entire lids for glass and metal vessels and in a few cases is already being used for the vessels themselves.
In the market are numerous products employing vents and/or silicone in their construction. Some are storage containers with a system of rigid lid with snap locks on the edges. The lids sometimes have a vent mechanism built-in to the lid. Some of the vents are hinged and some are manually displaced along the edge of the lid to permit “burping” the container. Some allow air circulation around the inner basket and some include a built-in compartment for holding desiccant packets to control humidity. Some containers incorporate a proprietary filter to regulate exchange of CO2 and O2 between the atmosphere and interior of the vessel to extend storage time.
These conventional prior art container systems all suffer from defects. The excellent air-tightness of LDPE and silicone lids to storage containers poses a problem when they are used as cooking vessels. In such cases, steam builds up while cooking thus increasing the pressure under the lid, causing the lid to blow off the container resulting in the contents splattering throughout the oven. User can lift the lid off and set on the top of the vessel, but splattering can still occur if small steam explosions in the food displace the lid.
Being completely air-tight at all times can be a disadvantage for storage of some fruits and vegetables that benefit from air circulation, but perhaps not needing to be completely open and uncovered. Fermentation is another cooking mode that needs some kind of ventilation to relieve the pressure of gas given off during fermentation (pickles, cabbage) or when yeast-leavened breads are rising. Also, putting hot foods in a container can lock down a lid when a vacuum is created as the air space above the food contracts as it cools.
Many of the above-noted conventional products have vents with small channels and crevices that can trap food that may mold over time, contaminating food stored in them. The vents are typically not integral to the lid, rather they are additional components that must be assembled to the lid (or container).
What is desired is a food storage vessel that can be both air-tight for effective food storage (blocks moisture from leaving and oxygen and microbes from entering) when needed and allows venting during storage or cooking with venting to prevent splattering and displacement of the lid. It would also be advantageous to be able to use the vents for draining off liquids from solids in the container, like draining off marinades, pasta cooking water, or cooking grease.
Another useful feature would be the ability to stack and nest for compact storage and be able to be washed easily and dry quickly.
The following paragraphs will describe an improved storage and cooking container that solves the issues presented in the prior art. The improved storage and cooking container is described below in its various embodiments to fulfill the above-stated objectives.
As best shown in
The ribs 18, 20 on the bowl 12 and the ribs 28, 30 on the lid 14 are arranged to provide first and second configurations of the lid on the bowl. In the first or sealing configuration, as shown in
The first configuration provides more sealing between the lid 14 and the bowl 12 in comparison to the second configuration, although in both configurations, the lid 14 is sufficiently engaged with the bowl 12 to contain the contents of the bowl in the interior of the bowl. In the second configuration, with the lower rib 30 of the lid 14 seated in the groove 22 formed between the upper and lower ribs 18, 20 of the bowl 12, the lid 14 is held above the bowl and will engage across at least one circumferential line of contact (that is contact between the lower rib 30 in the groove 22) to seal the bowl 12 using the lid 14. Preferably, the lower rib 30 on the lid 14 has a smaller minor diameter di than the diameter (dbg) of the groove 22 on the bowl 12 resulting in an interference fit, but with less interference than would result with displacement of the lid up or down relative to the bowl. Thus, the positioning is stable in the vented position or second configuration until substantial force is applied upward on the lid to remove the lid, or downward (by stretching either the bowl and/or the lid) to seat the lid in the lower, sealing position or first configuration. On the bowl 12, the major diameter (Dbu) of upper rib 18 is preferably smaller than the major diameter (Dbl) of the lower rib 20. On the lid 14, the minor diameter (dlu) of upper rib 28 is preferably larger than the minor diameter (dll) of the lower rib 30. This is to provide a more secure fit when the lid is in the upper, vented position.
As a seal may not be desired in a venting mode or second configuration, the lid 14 has a lower rib 30 provided with a number of small vent notches 40, which may be equiangularly spaced around the lower rib 30. The notches 40 may be formed to allow steam to escape or air to circulate when in the venting mode or second configuration. The notches 40 may also be sized to facilitate draining liquids from the bowl 12 like a marinade or cooking grease.
In the first configuration as shown in
Preferably, the extension tabs 16 extend below the flange 28 of the lid 14. When the lid 14 is set on a flat surface, air can circulate freely around both top and bottom faces of the lid. When a set of lids of the same design are stacked, they may be aligned by the extension tabs 16 and are less likely to topple over.
In summary, the disclosure provides the following advantages and characteristics:
Embodiment 1. A storage and cooking vessel comprises a bowl and a lid. The bowl is configured for containing a volume of foodstuffs, and is further comprised of a pair of parallel circumferential ribs raised on the outer surface adjacent to the top edge of the bowl spaced apart by a fixed distance where the pair of ribs form a groove between the ribs. The lid is comprised of an elastomeric material. The lid has a downward extending flange with a pair of parallel circumferential ribs raised on the inner surface of the flange spaced apart by a fixed distance. The pair of ribs forms a groove between the ribs. The lid can take one of two configurations or aligned positions when mounted to the bowl. The first or upper position (vented) aligns the lower rib on the lid with the groove between the ribs on the outer surface of the bowl. The second or lower position (sealed) aligns the upper rib on the outer surface of the bowl with the groove between the ribs on the inside of the lid. When in either of the aligned position(s), the lid is supported on the top of the bowl, the respective ribs and grooves touch without a gap around the circumference so as to form a continuous seal feature to prevent leakage (interference fit). The ribs are configured so that when the lid is set on the top of the bowl, some force is required to expand the flange on the lid to fit the lower rib of the lid into the groove on the bowl and additional force is required to push the upper rib on the lid into the groove on the bowl.
Embodiment 2. This embodiment includes the features of embodiment 1 and further includes the feature that the lower rib on the lid is further comprised of at least one notch to permit fluid (liquid or gas) leakage between the interior of the bowl and outside when the lid is in the upper position. This is to allow cooking in a microwave or conventional oven to prevent the build-up of steam blowing the lid off.
Embodiment 3. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, at least one notch of lower rib on the lid is made wide enough to allow fluids to be drained through the notch with the lid in the upper position (to drain marinades, cooking grease, etc. without losing contents).
Embodiment 4. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the lower rib on the lid is further comprised of at least one breather valve to permit fluid (liquid or gas) leakage between the interior of the bowl and outside when the lid is in the upper position. (This is to allow cooking in a microwave or conventional oven to prevent the build-up of steam blowing the lid off, and also for venting for fermentation).
Embodiment 5. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the breather valve is further comprised of a thin membrane formed into the lower rib that makes contact along a line with the outer face of the bowl that will distend to open a gap between the lid and bowl when there is a pressure difference inside and outside the bowl.
Embodiment 6. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the lid is further comprised of a backup rib extending into the interior of the bowl and contacting the inner edge of the bowl to resist the edge of the bowl from collapsing inward (when squeezed, thereby breaking the seal).
Embodiment 7. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the bowl is made from a rigid material or an elastomer material.
Embodiment 8. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the bowl is further made with a diameter (or minimum opening for non-round bowls) greater than the depth of the bowl.
Embodiment 9. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the bowl is further made sloped or with stepped sides so that they can be compactly nested (with one on top of the other).
Embodiment 10. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the bowl is further comprised of capacity markings on the interior wall at the completely full volume with additional different fractional levels marked in conventional volume units (ml, oz.)
Embodiment 11. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the lid is further made from platinum catalyst type silicone rubber with Durometer Shore A 73+/−3 uncured, 78+/−3 cured.
Embodiment 12. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the bowl is further made from platinum catalyst type silicone rubber with a Durometer of Shore A 75+/−3 uncured, 80+/−3 cured.
Embodiment 13. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the ribs may be further comprised of at least one circumferential rib of smaller cross section extending from the surface of the rib that provides increased interference between the ribs on the bowl with the groove on the lid for better sealing.
Embodiment 14. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the flange is further comprised of at least one extension tab that extends below the flange (to facilitate removal of the lid and drying when washed and set on a counter).
Embodiment 15. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, there are at least three extension tabs to facilitate alignment during stacking.
Embodiment 16. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the interference between the upper rib on the lid and groove on the bowl is greater than the interference between the lower rib on the lid and the groove on the bowl (to make it easier to take on and off).
Embodiment 17. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the minor diameter of the lower rib on the lid is greater than the minor diameter of the upper rib (to facilitate easier removal and insertion and tighter seal in the sealed position).
Embodiment 18. This embodiment may include any one or more of the features discussed in the previous embodiments. Further, the lid is further comprised of a window (plastic, glass) where the silicone is overmolded to make a composite material lid (to provide a better view of contents).
Embodiment 19. A storage and cooking vessel comprises a bowl and a lid. The bowl is configured for containing a volume of foodstuffs and is further comprised of a pair of parallel circumferential ribs raised on the inner surface adjacent to the top edge of the bowl spaced apart by a fixed distance. The pair of ribs forms a groove between the ribs. The lid is comprised of an elastomeric material, and is further comprised of a downward extending flange with a pair of parallel circumferential ribs raised on the outer surface of the flange. The pair of ribs form a groove between the ribs spaced apart by a fixed distance. The lid can take one of two positions relative to the bowl. The first or upper position (vented) aligns the lower rib on the lid with the groove between the ribs on the inner surface of the bowl. The second or lower position (sealed) aligns the upper rib on the inner surface of the bowl with the groove between the ribs on the outside of the lid. When in either of the aligned position(s), the lid is supported on the top of the bowl, and the respective ribs and grooves touch without a gap around the circumference so as to form a continuous seal feature to prevent leakage (interference fit). The ribs are configured so that when the lid is set on the top of the bowl, some force is required to contract the flange on the lid to fit the lower rib on the lid into the groove on the bowl and additional force is required to push the upper rib on the lid into the groove on the bowl.
Embodiment 20. This embodiment may include any one or more of the features of embodiment 19. Further, the lid is further comprised of a backup rib extending to the exterior of the bowl and contacting the outer edge of the bowl to resist the edge of the bowl from spreading outward (when squeezed, thereby breaking the seal).
Embodiment 21. This embodiment may include any one or more of the features of embodiment 19 or a latter embodiment. Further, the lower rib on the lid is further comprised of at least one notch to permit fluid leakage between the interior of the bowl and outside when the lid is in the upper position. (This is to allow cooking in a microwave or conventional oven to prevent the build-up of steam blowing the lid off).
Embodiment 22. This embodiment may include any one or more of the features of embodiment 19 or a latter embodiment. Further, the bowl is further made from an elastomeric material.
Embodiment 23. This embodiment may include any one or more of the features of embodiments 19 or a latter embodiment. The bowl is further made with a diameter (or minimum opening for non-round bowls) greater than the depth of the bowl.
Embodiment 24. This embodiment may include any one or more of the features of embodiments 19 or a latter embodiment. Further, the lid is further made from platinum catalyst type silicone rubber with Durometer Shore A 73+/−3 uncured, 78+/−3 cured.
Embodiment 25. This embodiment may include any one or more of the features of embodiments 19 or a latter embodiment. Further, the bowl is further made from platinum catalyst type silicone rubber with a Durometer of Shore A 75+/−3 uncured, 80+/−3 cured.
Embodiment 26. This embodiment may include any one or more of the features of embodiments 19 or a latter embodiment. Further, the ribs may be further comprised of at least one smaller circumferential rib that provides increased interference between the ribs on the bowl with the groove on the lid for better sealing.
Embodiment 27. This embodiment may include any one or more of the features of embodiments 19 or a latter embodiment. Further, the lid of this section is further comprised of at least one extension tab (to facilitate removal of the lid)
Embodiment 28. This embodiment may include any one or more of the features of embodiments 19 or a latter embodiment. Further, the interference between the upper rib on the lid and groove on the bowl is greater than the interference between the lower rib on the lid and the groove on the bowl (to make it easier to take on and off).
Embodiment 29. This embodiment may include any one or more of the features of embodiments 19 or a latter embodiment. Further, the lid is further comprised of a window (plastic, glass) where the silicone is overmolded to make a composite material lid.
A couple of possible implementations of a food storage and cooking vessel with integral vents have been presented. They address the problems addressed in the early sections.
Further embodiments can be envisioned to one of ordinary skill in the art after reading this disclosure. In other embodiments, combinations or sub-combinations of the above disclosed invention can be advantageously made. The example arrangements of components are shown for purposes of illustration and it should be understood that combinations, additions, re-arrangements, and the like are contemplated in alternative embodiments of the present invention. Thus, while the invention has been described with respect to exemplary embodiments, one skilled in the art will recognize that numerous modifications are possible.
This application claims the benefit of U.S. provisional application Ser. No. 63/434,318, filed on Dec. 21, 2022, the disclosure of which is incorporated by reference herein.
Number | Date | Country | |
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63434318 | Dec 2022 | US |