Patent US4989748A successfully refreshed from Google Patents.
US4989748A
Expired / Lapsed
US
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Moisture recirculating cover for microwave oven dish
Assignee: Individual
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Filing: 1990-04-04
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Granted: 1991-02-05
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Expires: 2010-04-04
Abstract
Abstract The cone-shaped or dome-shaped sheet of waxed paper or freezer paper having a moisture retarding coating on at least the surface of the paper facing an underlying dish bearing food and positioned within a microwave oven, and being microwave transparent traps moisture condensing on the interior surface thereof for revaporization for return to the food being heated and/or cooked while preventing the dripping of condensed moisture directly onto the food within the underlying dish. Preferably the conical or dome-shaped cover is mechanically embossed to form vertically spaced annular concave cavities facing inwardly to trap the moisture running by gravity down the interior surface of the cover within the cavities for revaporization. Additionally, circumferentially spaced reinforcing ribs may be formed over the height of the cover to maintain the cover one or dome shaped configuration throughout the microwave oven heating process. An open mesh frame may be employed for supporting the cover overlying the dish bearing the food. Integral flaps cut out of the cover about three sides, with the exception of a horizontal hinge allow the flaps to open outwardly and curl upwardly under excessive moisture accumulation within the cover, and to close upon cooling of the cover at termination of the microwave oven operation. A unitary, folded under, reinforcing lip at the bottom of the conical or dome-shaped cover captures condensed moisture to facilitate revaporization and return of all moisture to the food being heated or cooked.
Inventors
- 👤 Guy H. Parr, Jr.
- 👤 Robert F. Prettyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:15
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/06; A47G; A47G19/00; A47G19/26; A47J36/02; A47J36/027
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
98 words
In a cover for a dish for heating or cooking food in a microwave oven, said cover being formed of microwave-transparent paper, the improvement wherein: said paper includes, at least on the surface thereof facing said dish, a moisture resistant material, said cover is configured to provide a downwardly and outwardly sloping interior surface from the top to bottom, for preventing dripping of condensed moisture onto the food within said underlying dish, and said cover further comprises: means for reinforcing said paper cover, and means for trapping otherwise uninhibited moisture condensing on the interior surface thereof for revaporization.
Claim 2
Dependent Claim
98 words
In a cover for a dish for heating or cooking food in a microwave oven, said cover being formed of microwave-transparent paper, the improvement wherein: said paper includes, at least on the surface thereof facing said dish, a moisture resistant material, said cover is configured to provide a downwardly and outwardly sloping interior surface from the top to bottom, for preventing dripping of condensed moisture onto the food within said underlying dish, and said cover further comprises: means for reinforcing said paper cover, and means for trapping otherwise uninhibited moisture condensing on the interior surface thereof for revaporization.
Claim 3
Dependent Claim
14 words
A cover as claimed in claim 1, wherein said paper is a waxed paper.
Claim 4
Dependent Claim
16 words
The cover as claimed in claim 2, wherein said paper is a one side wet paper.
Claim 5
Dependent Claim
16 words
The cover as claimed in claim 2, wherein said paper is a two side wet paper.
Claim 6
Dependent Claim
24 words
The cover as claimed in claim 1, wherein said paper comprises a freezer paper having a water impervious plastic coating on said interior surface.
Claim 7
Dependent Claim
17 words
The cover as claimed in claim 1, wherein said cover is in the shape of a cone.
Claim 8
Dependent Claim
12 words
The cover as claimed in claim 1, wherein said cover is dome-shaped.
Claim 9
Dependent Claim
81 words
The cover as claimed in claim 1, wherein said cover is partially cut along two sides and a bottom, forming a flap joined by an integral hinge extending horizontally, whereby the flap tends to open outwardly and curl upwardly upon accumulation of moisture vapor during cooking and/or heating of the food, and which flap within the interior of said cover automatically straightens out and dries upon termination of the operation of the microwave oven and heating and/or cooking of the food.
Claim 10
Dependent Claim
54 words
The cover as claimed in claim 1, wherein said means for trapping moisture condensing on the interior surface of the cover comprises irregularly applied liquid impervious coating on the surface of the paper facing the dish constituting a primary trap for the collection of moisture droplets at nodes formed by the irregular applied coating.
Claim 11
Dependent Claim
61 words
The cover as claimed in claim 1, wherein said means for trapping moisture condensing on the interior surface of the cover comprises concentric ring-form embossments of concave configuration, facing in the direction of the interior of the cover at vertically spaced positions over the height of the cover to form moisture collection cavities limiting downward movement of condensate under gravity influence.
Claim 12
Dependent Claim
57 words
The cover as claimed in claim 1, wherein said means for trapping moisture condensing on the interior surface of the cover comprises a lip integral with the cover at a bottom edge of the cover, and folded radially inwardly, functioning as a container for condensed moisture running off the interior surface of the cover under gravity influence.
Claim 13
Dependent Claim
26 words
The cover as claimed in claim 1, wherein said means for reinforcing said cover comprises circumferentially spaced upwardly extending ribs over the height of the cover.
Claim 14
Dependent Claim
36 words
The cover as claimed in claim 1, wherein said cover includes an integral tab extending outwardly of the cover at the top thereof for manual handling of the cover by lifting the cover via said tab.
Claim 15
Dependent Claim
43 words
The cover as claimed in claim 2, wherein said cover is formed of 27 lb. weight waxed paper, consisting of an 18 lb. base paper with 9 lb wax coating thereon, and wherein said waxed paper is of approximately 2.2 mill in thickness.
Claim 16
Dependent Claim
38 words
The cover as claimed in claim 6, further comprising an open mesh frame having a conical configuration matching that of said cover and fitted internally thereof for supporting said cone shaped cover on said dish overlying said food.
Claim 17
Dependent Claim
20 words
The cover as claimed in claim 11, further including a ring positioned within said lip for weighting said bottom edge.
Claim 18
Dependent Claim
62 words
The cover as claimed in claim 9, wherein said means for trapping moisture condensing on the interior surface of the cover further comprises concentric ring-formed embossments of concave configuration, facing in the direction of the interior of the cover at vertically spaced positions over the height of the cover to form moisture collection cavities limiting downward movement of condensate under gravity influence.
Claim 19
Dependent Claim
58 words
The cover as claimed in claim 17, wherein said means for trapping moisture condensing on the interior surface of the cover further comprises a lip integral with the cover at a bottom edge of the cover, and folded radially inwardly, functioning as a container for condensed moisture running off the interior surface of the cover under gravity influence.
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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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |