Patent US1987382A successfully refreshed from Google Patents.
Patent US5126520A successfully refreshed from Google Patents.
US5126520A
Expired / Lapsed
US
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Shielded cover for a microwave container
Assignee: G & S METAL PRODUCTS COMPANY Inc A CORP OF OH
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Filing: 1991-03-25
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Granted: 1992-06-30
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Expires: 2011-03-25
Abstract
Abstract A shielded cover for a microwave container having upper and lower layers and a diamond-shaped metallic ring therebetween. The ring surrounds an upwardly extending multi-step truncated pyramid formed out of the center section of the upper and lower layers of the cover. The top surface of the truncated pyramid includes a series of openings to vent steam produced within the container. Microwave radiation produced by the microwave oven is reflected by the metallic ring and therefore only penetrates the cover to enter or exit the container at the corners and the center section of the cover. Microwaves are concentrated at the center section of the container and retained within the container, heating the center of the food therein proportionally more than the outer portion of the food, resulting food having a uniform and consistent temperature throughout.
Inventors
- 👤 John R. Nottingham
- 👤 John W. Spirk
- 👤 Paul E. Brokaw
- 👤 Craig M. Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:52
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; A47J36/027; B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D81/3453; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/344; B65D2581/3441; B65D2581/3471; B65D2581/3472; B65D2581/3479; B65D2581/3486; B65D2581/3489; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A cover for a microwave food container, said cover being made from a plastic material which is substantially transparent to microwaves and having a rectangular configuration defined by rectilinear edge portions, a microwave impenetrable diamond shaped ring associated with said cover to render a portion of the cover substantially opaque to microwaves, said diamond shaped ring having four rectilinear sides angularly related to each other and each being angularly related to each of said rectilinear edge portions, said diamond shaped ring surrounding a middle section of the cover, said middle section being transparent to microwaves and being sized and shaped to allow substantial portions of the microwaves entering the container through said middle section.
Claim 2
Dependent Claim
114 words
A cover for a microwave food container, said cover being made from a plastic material which is substantially transparent to microwaves and having a rectangular configuration defined by rectilinear edge portions, a microwave impenetrable diamond shaped ring associated with said cover to render a portion of the cover substantially opaque to microwaves, said diamond shaped ring having four rectilinear sides angularly related to each other and each being angularly related to each of said rectilinear edge portions, said diamond shaped ring surrounding a middle section of the cover, said middle section being transparent to microwaves and being sized and shaped to allow substantial portions of the microwaves entering the container through said middle section.
Claim 3
Dependent Claim
24 words
A cover for a microwave food container according to claim 1, wherein said sides are angularly related to each other by 90 degree angles.
Claim 4
Dependent Claim
29 words
A cover for a microwave food container according to claim 2, wherein each of said sides is angularly related to each of said edge portions by 45 degree angles.
Claim 5
Dependent Claim
32 words
A cover for a microwave food container according to claim 3, wherein the cover includes a raised center portion which provides a plurality of openings to vent steam produced under said cover.
Claim 6
Dependent Claim
38 words
A cover for a microwave food container according to claim 4, wherein said raised center portion includes at least one step which leads to a substantially planar upper surface, said upper surface providing said openings to vent steam.
Claim 7
Dependent Claim
24 words
A cover for a microwave food container according to claim 5, wherein said raised center portion is defines an upwardly extending multi-step truncated pyramid.
Claim 8
Dependent Claim
25 words
A cover for a microwave food container according to claim 1, said cover further comprising a middle section defining an upwardly extending multi-step truncated pyramid.
Claim 9
Dependent Claim
33 words
A cover for a microwave food container according to claim 7, wherein said multi-step truncated pyramid provides an upwardly directed face defining a plurality of openings for venting steam produced under said cover.
Claim 10
Dependent Claim
67 words
A cover for a microwave food container according to claim 1, said cover further comprising a plurality of downwardly detachable supporting legs and a downwardly extending flange along the said rectilinear edge portions of said cover, each of said legs being provided with an upwardly opening groove which detachably engages a portion of said downwardly extending flange to support said cover above a food to be heated.
Claim 11
Dependent Claim
26 words
A cover for a microwave food container according to claim 9, wherein said cover further comprises a middle section defining an upwardly extending multi-step truncated pyramid.
Claim 12
Dependent Claim
33 words
A cover for a microwave food container according to claim 10, wherein said multi-step truncated pyramid provides an upwardly directed face defining a plurality of openings for venting steam produced under said cover.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |