US4530440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container lid with temperature responsive vents
Assignee: Buxdel Pty Ltd
•
Filing: 1982-08-03
•
Granted: 1985-07-23
•
Expires: 2002-08-03
Abstract
Abstract A food storage and reheating receptacle (1) with a lid having heat openable apertures (4). Material of lid is such that cut outs on lid tend to bend or deflect from lid surface upon heating thereby causing ventilation of contents of receptacle.
Inventors
- 👤 Christopher Leong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:45
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; A47J36/022; B; B65; B65D; B65D81/00; B65D81/34; B65D81/343; B65D2205/00; Y; Y10; Y10S; Y10S229/00; Y10S229/902; Y10S229/903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
A disposable lid for use with a disposable food receptacle of the type useful for the storage and heating of food, the lid having at least one vent means which opens by deforming upon the application of heat, the lid being multi-layered with at least two of the layers having different co-efficients of thermal expansion.
Claim 2
Dependent Claim
55 words
A disposable lid for use with a disposable food receptacle of the type useful for the storage and heating of food, the lid having at least one vent means which opens by deforming upon the application of heat, the lid being multi-layered with at least two of the layers having different co-efficients of thermal expansion.
Claim 3
Dependent Claim
20 words
A disposable lid as in claim 1 wherein the lid is cardboard having an aluminium foil on one surface thereof.
Claim 4
Dependent Claim
52 words
A disposable lid as in claim 1 wherein the heat openable vent comprises a portion of the lid defined by a peripheral cut through the thickness of the lid except for a portion of the periphery such that the heat openable vent is still attached to the main body of the lid.
Claim 5
Dependent Claim
49 words
A disposable lid as in claim 3 wherein the heat openable vent has a shape defined by the peripheral cut through the thickness of the lid selected from a group comprising a U-shape, a V shape, a cross shape, a circular shape, a tongue shape and a rectangular shape.
Claim 6
Dependent Claim
15 words
A container including a disposable lid having heat openable vents as defined in claim 1.
Claim 7
Dependent Claim
61 words
A disposable lid for use with a disposable food receptacle of the type useful for the storage and heating of food, the lid having at least one heat openable vent formed by a cut through the lid, the lid comprising at least two layers having different expansion and contraction rates such that the application of heat causes the vent to open.
Claim 8
Dependent Claim
61 words
A disposable lid for use with a disposable food receptacle of the type useful for the storage and heating of food, the lid having at least one heat openable vent formed by a cut through the lid, the lid comprising at least two layers having different expansion and contraction rates such that the application of heat causes the vent to open.
Claim 9
Dependent Claim
67 words
A disposable lid for use with a disposable food receptacle of the type useful for the storage and heating of food, the lid including a plurality of flaps each formed by a cut through the lid, the lid comprising at least two layers having different thermal expansion and contraction rates such that upon the application of heat said flaps deflect and thereby form apertures in the lid.
Claim 10
Dependent Claim
67 words
A disposable lid for use with a disposable food receptacle of the type useful for the storage and heating of food, the lid including a plurality of flaps each formed by a cut through the lid, the lid comprising at least two layers having different thermal expansion and contraction rates such that upon the application of heat said flaps deflect and thereby form apertures in the lid.
Claim 11
Dependent Claim
84 words
A disposable lid for use with a disposable food receptacle of the type useful for the storage and heating of food, the lid having at least one vent means which opens by deforming upon the application of heat, the lid being made of cardboard and opening of the vent means being due to differences in the expansion or contraction of an upper and a lower surface of the cardboard upon the drying out of one surface which is moist, the other surface remaining unmoisturized.
Claim 12
Dependent Claim
84 words
A disposable lid for use with a disposable food receptacle of the type useful for the storage and heating of food, the lid having at least one vent means which opens by deforming upon the application of heat, the lid being made of cardboard and opening of the vent means being due to differences in the expansion or contraction of an upper and a lower surface of the cardboard upon the drying out of one surface which is moist, the other surface remaining unmoisturized.
References Cited (Backward Citations)
CA595306A
Cited
US2686608A
Cited
US3047235A
Cited
GB926198A
Cited
US3468471A
Cited
US3432087A
Cited
US3387765A
Cited
US3716180A
Cited
US4141487A
Cited
US4210674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |