Patent US4859822A successfully refreshed from Google Patents.
US4859822A
Expired / Lapsed
US
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Microwaveable container
Assignee: Pactiv LLC
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Filing: 1988-05-19
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Granted: 1989-08-22
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Expires: 2008-05-19
Abstract
Abstract A container constituted of a microwave transparent material for the heating or cooking of foods or comestibles through the intermediary of microwaves at a high degree of efficiency and with an enhanced temperature uniformity. The container base is configured in a manner to produce generally wavilinear or undulating bottom wall and side wall configurations which will disperse the food or comestible within the container to an optimum extent so as to increase the heating and cooking efficiency thereof, and to provide a more uniform temperature distribution throughout the container contents, thereby enabling the rapid and even heating and/or cooking of the food by microwave energy. The container may include a closure lid, essentially consisting of a domed structure incorporating a vent or one-way release valve for steam generated within the container during microwave cooking, and which is mountable on the container base such as to provide an essentially sealed container structure during the microwave heating and/or cooking of the food in the container.
Inventors
- 👤 James J. Ragusa
- 👤 Gordon V. Sharps, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:10
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D81/3453; A; A47; A47J; A47J36/00; A47J36/02; A47J36/027; B65D2205/00; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/344; B65D2581/3441; Y; Y10; Y10S; Y10S220/00; Y10S220/13; Y10S229/00; Y10S229/902; Y10S229/903; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
A container constituted of a microwave-transparent material for the heating or cooking of foods, said container including a bottom wall having a contoured wavilinear peripheral configuration and a raised center portion; a peripheral upstanding side wall structure having an undulating contour; a curvilinear transition wall surface joining said bottom wall structure with the lower end of said side wall structure, the container bottom wall and side wall configurations enabling the distribution of the foods within said container so as to enhance the degree of uniformity in the heating or cooking of said foods in said container by microwave energy; and a radially outwardly projecting peripheral flange extending from the upper edge of said peripheral side wall structure so as to impart stability to said container during storage and enhance the strength of said container during handling and lifting thereof, said flange including a raised flange portion extending about the opening of said container adapted to sealingly engage a complementary flange structure on a cover for said container.
Claim 2
Dependent Claim
167 words
A container constituted of a microwave-transparent material for the heating or cooking of foods, said container including a bottom wall having a contoured wavilinear peripheral configuration and a raised center portion; a peripheral upstanding side wall structure having an undulating contour; a curvilinear transition wall surface joining said bottom wall structure with the lower end of said side wall structure, the container bottom wall and side wall configurations enabling the distribution of the foods within said container so as to enhance the degree of uniformity in the heating or cooking of said foods in said container by microwave energy; and a radially outwardly projecting peripheral flange extending from the upper edge of said peripheral side wall structure so as to impart stability to said container during storage and enhance the strength of said container during handling and lifting thereof, said flange including a raised flange portion extending about the opening of said container adapted to sealingly engage a complementary flange structure on a cover for said container.
Claim 3
Dependent Claim
21 words
A container as claimed in claim 1, wherein wavilinear peripheral configuration of said bottom wall is of a generally undulating shape.
Claim 4
Dependent Claim
21 words
A container as claimed in claim 1, wherein said undulating side wall structure essentially defines a cloverleaf contour in plan view.
Claim 5
Dependent Claim
16 words
A container as claimed in claim 1, wherein said peripheral flange has a generally rectangular configuration.
Claim 6
Dependent Claim
66 words
A container as claimed in claim 1, wherein said curvilinear transition wall surface comprises a rounded base connecting the circumference of said bottom wall with the lower end of said side wall structure so as to enhance the heating or cooking of the foods in said container while concurrently inhibiting the formation of hot spots adversely affecting the degree of uniformity of said heating or cooking
Claim 7
Dependent Claim
53 words
A container as claimed in claim 1, wherein said container cover comprises a domed lid member having a peripheral radially projecting flange; and recess means in said flange for sealingly engaging th raised flange portion on said container upon superposition of said lid member on said container to form a sealed container arrangement.
Claim 8
Dependent Claim
24 words
A container as claimed in claim 6, wherein said flange on said domed lid member is substantially coextensive with the flange on said container.
Claim 9
Dependent Claim
35 words
A container as claimed in claim 6, wherein said domed lid member includes venting means for the release of steam from the interior of said container arrangement during the heating or cooking of said comestibles.
Claim 10
Dependent Claim
24 words
A container as claimed in claim 8, wherein said venting means comprises a one-way valve arranged in the domed portion of said lid member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |