초록 ▼

A lid for a food storage container includes a lid body with a vacuum sense opening and a vent opening extending through the lid body, a releasable cover disposed over the vent opening, and a pressure-indicating protrusion. The cover impedes air flow into the container through the vent opening until

A lid for a food storage container includes a lid body with a vacuum sense opening and a vent opening extending through the lid body, a releasable cover disposed over the vent opening, and a pressure-indicating protrusion. The cover impedes air flow into the container through the vent opening until the cover is released. The pressure-indicating protrusion, which has a cavity in it, is in hydraulic communication with the container through the vacuum sense opening. The pressure-indicating protrusion contracts toward the vacuum sense opening in response to negative container pressure.

대표청구항 ▼

What is claimed is: 1. A lid for a food storage container, the lid comprising: a lid body defining a vacuum sense opening and a vent opening extending through the lid body; a releasable cover disposed over the vent opening to impede air flow into the container through the vent opening until the cov

What is claimed is: 1. A lid for a food storage container, the lid comprising: a lid body defining a vacuum sense opening and a vent opening extending through the lid body; a releasable cover disposed over the vent opening to impede air flow into the container through the vent opening until the cover is released, while enabling evacuation of the container through the vent opening before the cover is released, the cover defining an indicator opening; and a pressure-indicating protrusion in hydraulic communication with the container through the vacuum sense opening and defining a cavity therein, wherein the pressure-indicating protrusion contracts toward the vacuum sense opening in response to negative container pressure. 2. The lid of claim 1, wherein the pressure-indicating protrusion comprises a bellows that is sealed at one end by a pressure-indicating plug. 3. The lid of claim 1, wherein the pressure-indicating protrusion comprises a membrane. 4. The lid of claim 3, wherein the membrane is pleated. 5. The lid of claim 4, wherein the pressure-indicating protrusion further comprises a pressure-indicating plug at one end of the membrane. 6. The lid of claim 5, wherein the cover defines an indicator opening and wherein the pressure-indicating plug, under certain container pressure conditions, extends through the indicator opening. 7. The lid of claim 5, wherein the pressure-indicating plug is of a different color from the cover. 8. The lid of claim 3, wherein the membrane collapses toward the vacuum sense opening in response to negative container pressure. 9. The lid of claim 3, wherein the membrane folds toward the vacuum sense opening in response to negative container pressure. 10. The lid of claim 3, further comprising a resilient layer in contact with the membrane. 11. The lid of claim 10, wherein the resilient layer comprises a spring sheet. 12. The lid of claim 10, wherein the resilient layer comprises an elastomeric polymer. 13. The lid of claim 3, wherein the cover defines an indicator opening, and wherein the membrane, under certain container pressure conditions, extends through the indicator opening. 14. The lid of claim 3, wherein the membrane is formed of a plastic resin. 15. The lid of claim 14, wherein the plastic resin is selected to maintain dimensional stability of the membrane over a temperature range between-40째 C. and 100째 C. 16. The lid of claim 1, further comprising a one-way valve. 17. The lid of claim 16, wherein the one-way valve comprises a movable sealing tab. 18. The lid of claim 17, wherein the pressure-indicating protrusion is integrally connected with the sealing tab. 19. The lid of claim 1, wherein the cover is pivotably connected to the lid body by a hinge. 20. The lid of claim 1, wherein the pressure-indicating protrusion comprises a spring. 21. The lid of claim 1, wherein the pressure-indicating protrusion comprises a resilient material. 22. A lid for a food storage container, the lid comprising: a lid body defining a vent opening therethrough; a releasable cover disposed over the vent opening to impede air flow into the container through the vent opening until the cover is released, the releasable cover defining an evacuation opening and having a gripping surface for manually releasing the cover; a membrane that covers the vent opening until the cover is released; and a driving element connected to the membrane at one end and disposed within the evacuation opening at another end, the driving element being configured to lift the membrane from the vent opening when the cover is released. 23. The lid of claim 22, wherein the membrane comprises an elastomeric plastic. 24. The lid of claim 22, wherein the membrane is a one-way valve. 25. The lid of claim 22, wherein the driving element defines a rim. 26. The lid of claim 22, wherein the driving element is integrally connected to the membrane. 27. The lid of claim 22, wherein the cover defines a surface extending about the evacuation opening and adapted to receive a sealing lip of a vacuum pump. 28. The lid of claim 22, wherein the lid body comprises a plastic resin selected to maintain dimensional stability of the membrane over a temperature range of between-40째 C. and 100째 C. 29. A lid for a food storage container, the lid comprising: a lid body defining, spaced apart and extending parallel through the lid body, a vacuum sense opening, a ventilation channel, and a vent opening; a releasable cover disposed over the ventilation channel to impede air flow into the container through the ventilation channel until the cover is released, while enabling evacuation of the container through the vent opening before the cover is released, the cover defining an indicator opening; and a pressure-indicating protrusion in hydraulic communication with the container through the vacuum sense opening and defining a cavity therein, wherein the pressure-indicating protrusion contracts toward the vacuum sense opening in response to negative container pressure. 30. The lid of claim 29, wherein the pressure-indicating protrusion comprises a bellows that is sealed at one end by a pressure-indicating plug. 31. The lid of claim 29, wherein the pressure-indicating protrusion comprises a membrane. 32. The lid of claim 31, wherein the membrane is pleated. 33. The lid of claim 32, wherein the pressure-indicating protrusion further comprises a pressure-indicating plug at one end of the membrane. 34. The lid of claim 33, wherein the pressure-indicating plug, under certain container pressure conditions, extends through the indicator opening. 35. The lid of claim 33, wherein the pressure-indicating plug is of a different color from the cover. 36. The lid of claim 31, wherein the membrane collapses toward the vacuum sense opening in response to negative container pressure. 37. The lid of claim 31, wherein the membrane folds toward the vacuum sense opening in response to negative container pressure. 38. The lid of claim 31, wherein the membrane, under certain container pressure conditions, extends through the indicator opening.