US4924048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tray for use in microwave ovens with heat sealed cover and inner lid
Assignee: Crown Packaging UK Ltd
•
Filing: 1989-04-11
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Granted: 1990-05-08
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Expires: 2009-04-11
Abstract
Abstract A tray-type food container for food which is to be heated or re-heated in the container comprises both a flat outer lid heat-sealed to a horizontal flange on the tray and a perforated inner lid of substantially rigid and preferably transparent material which is supported on a step in the wall of the tray and is shaped so as to extend above the level of the step and to provide finger holes whereby it may be grasped and removed after the outer lid has been removed. The inner lid may support the outer lid flush with the flange. The flange may have a peripheral groove to form a guide for a knife for removal of the outer lid. The flange may also carry heating instructions in a machine readable code. A vending machine comprising a microwave oven may be provided with means for selecting a container from a number of stacks and with means for reading the coded heating instructions and regulating the energy supply to the microwave oven accordingly.
Inventors
- 👤 Martin C. Bunce
- 👤 David W. Helps
- 👤 Leonard A. Jenkins
- 👤 Adrian C. Noke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:31
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D81/3453; B65D51/00; B65D51/18; B65D51/185; B65D2205/00; B65D2251/00; B65D2251/0003; B65D2251/0006; B65D2251/0031; B65D2251/0068; B65D2251/0081; Y; Y10; Y10S; Y10S229/00; Y10S229/902; Y10S229/903; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
A food container formed of a material suitable for use in microwave ovens comprising: an upstanding peripheral wall; a horizontal flange extending outwardly from said wall around its periphery; an outer lid heat-sealed to the horizontal flange around its periphery; a step formed in said peripheral wall; and an inner lid formed of a substantially rigid material supported by said step and comprising an upwardly extending peripheral wall and a substantially flat top portion perforated so as to permit venting when the outer lid has been removed and food is heated in the tray; said upwardly extending peripheral wall extending to a sufficient height above said step so that said top portion of the inner lid serves to support the outer lid; and said upwardly extending peripheral wall being shaped to provide indented portions which act as fingerholds whereby the inner lid may be grasped and removed after the outer lid has been removed.
Claim 2
Dependent Claim
154 words
A food container formed of a material suitable for use in microwave ovens comprising: an upstanding peripheral wall; a horizontal flange extending outwardly from said wall around its periphery; an outer lid heat-sealed to the horizontal flange around its periphery; a step formed in said peripheral wall; and an inner lid formed of a substantially rigid material supported by said step and comprising an upwardly extending peripheral wall and a substantially flat top portion perforated so as to permit venting when the outer lid has been removed and food is heated in the tray; said upwardly extending peripheral wall extending to a sufficient height above said step so that said top portion of the inner lid serves to support the outer lid; and said upwardly extending peripheral wall being shaped to provide indented portions which act as fingerholds whereby the inner lid may be grasped and removed after the outer lid has been removed.
Claim 3
Dependent Claim
41 words
A food container according to claim 1 wherein said upwardly extending peripheral wall of the inner lid extends above the level of the step to such an extent that said top portion supports the outer lid flush with the horizontal flange.
Claim 4
Dependent Claim
38 words
A food container according to claim 1, wherein the inner lid has a peripheral flange for seating on the step, and wherein the upwardly extending peripheral wall of the inner lid is inclined upwardly from the peripheral flange.
Claim 5
Dependent Claim
13 words
A food container according to claim 1, wherein the inner lid is transparent.
Claim 6
Dependent Claim
27 words
A food container according to claim 1, wherein the horizontal flange is extended to two opposite locations to form a pair of handles for carrying the container.
Claim 7
Dependent Claim
49 words
A food container according to claim 1 wherein the horizontal flange on the tray is formed with a groove extending around its upper surface to form a guide for a knife for removal of the portion of the outer lid which lies inside the area bounded by the groove.
Claim 8
Dependent Claim
21 words
A food container according to claim 1, wherein the tray is formed of a laminate of a metal and a polymer.
Claim 9
Dependent Claim
30 words
A food container according to claim 1 wherein the tray is formed of a laminate of different polymers chosen to provide the laminate with a high barrier to oxygen permeation.
References Cited (Backward Citations)
US2880859A
Cited
US3054679A
Cited
US3245338A
Cited
US3597238A
Cited
US3997677A
Cited
GB1530605A
Cited
US4210674A
Cited
US4327136A
Cited
US4590078A
Cited
US4592914A
Cited
US4574174A
Cited
US4661671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |