US5213902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oven package
Assignee: CAMINE RESOURCES Inc
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Filing: 1991-02-19
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Granted: 1993-05-25
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Expires: 2011-02-19
Abstract
Abstract A laminate structure useful for incorporating into a package structure for the microwave cooking of foodstuffs for consumption comprises an outer layer polymeric material, an outer layer of microwave transparent material, a grid layer having an electroconductive surface surrounding transmissive apertures located between the outer layers, and a thin layer of electroconductive material of sufficient thickness so that a portion of incident microwave energy is converted to thermal energy also located between the outer layers. The structure is useful in providing controlled surface heating and microwave transmittance to achieve a more uniformly heated product employing
Inventors
- 👤 D. Gregory Beckett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:35
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/12; B32B3/00; B32B3/10; B32B15/043; B32B15/08; B32B15/20; B32B3/26; B32B3/266; B32B7/00; B32B7/04; B32B7/12; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B32B2311/00; B32B2311/24; B32B2439/00; B32B2439/70; B65D2581/00; B65D2581/34; B65D2581/3401; B65D2581/3402; B65D2581/3405; B65D2581/3406; B65D2581/3437; B65D2581/3439; B65D2581/344; B65D2581/3452; B65D2581/3454; B65D2581/3463; B65D2581/3466; B65D2581/3467; B65D2581/3471; B65D2581/3472; B65D2581/3477; B65D2581/3478; B65D2581/3486; B65D2581/3489; B65D2581/3494; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12361; Y10T428/12368
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
109 words
A laminate structure, useful for forming a food package for a microwave oven, which comprises: a polymeric film layer, a layer of material adhered to the polymeric film layer and defining a grid, the grid having an electroconductive surface surrounding transmissive apertures, a thin layer of electroconductive material of sufficient thickness that a portion of incident microwave energy is converted to thermal energy, said thin layer of electroconductive material overlaying said grid layer and being in abutting contact with and directly adhered to said electroconductive surface and to said polymeric film layer in said apertures, and a substrate layer of microwave transparent material adhered to the electroconductive material layer.
Claim 2
Dependent Claim
109 words
A laminate structure, useful for forming a food package for a microwave oven, which comprises: a polymeric film layer, a layer of material adhered to the polymeric film layer and defining a grid, the grid having an electroconductive surface surrounding transmissive apertures, a thin layer of electroconductive material of sufficient thickness that a portion of incident microwave energy is converted to thermal energy, said thin layer of electroconductive material overlaying said grid layer and being in abutting contact with and directly adhered to said electroconductive surface and to said polymeric film layer in said apertures, and a substrate layer of microwave transparent material adhered to the electroconductive material layer.
Claim 3
Dependent Claim
14 words
The structure of claim 1, wherein said microwave transparent material is paper or paperboard.
Claim 4
Dependent Claim
13 words
The structure of claim 1, wherein said microwave transparent material is polymeric material.
Claim 5
Dependent Claim
18 words
The structure of claim 1, wherein said layer of material defining the grid is formed of aluminum foil.
Claim 6
Dependent Claim
19 words
The structure of claim 4 wherein said aluminum foil has a thickness of about 1 to about 15 microns.
Claim 7
Dependent Claim
30 words
The structure of claim 5 wherein said thin layer of electroconductive material is formed of aluminum having a thickness corresponding to an optical density of about 0.1 to about 0.4.
Claim 8
Dependent Claim
19 words
The structure of claim 5 wherein said aluminum foil has a thickness of about 3 to about 10 microns.
Claim 9
Dependent Claim
16 words
The structure of claim 4 wherein said thin layer of electroconductive material is formed of aluminum.
Claim 10
Dependent Claim
23 words
The structure of claim 8 wherein said aluminum layer has a thickness corresponding to an optical density of about 0.08 to about 1.0.
Claim 11
Dependent Claim
14 words
The structure of claim 4 wherein said transmissive apertures each has a square outline.
Claim 12
Dependent Claim
18 words
The structure of claim 10 wherein said apertures have a width of about 0.125 to about 2 inches.
Claim 13
Dependent Claim
15 words
The structure of claim 11 wherein said width is about 0.375 to about 0.875 inch.
Claim 14
Dependent Claim
119 words
A laminate structure, useful for forming a food package for a microwave oven, which comprises: a polymeric film layer, a layer of material adhered to the polymeric film layer and defining a grid, the grid having an electroconductive surface surrounding transmissive apertures, said electroconductive surface of said grid having a layer of etchant-resistant material thereon, a thin layer of electroconductive material of sufficient thickness that a portion of incident microwave energy is converted to thermal energy, said thin layer of electroconductive material overlying said grid layer and being adhered to said etchant-resistant material on said electroconductive surface and to said polymeric film in said apertures, and a substrate layer of microwave transparent material adhered to the electroconductive material layer.
Claim 15
Dependent Claim
119 words
A laminate structure, useful for forming a food package for a microwave oven, which comprises: a polymeric film layer, a layer of material adhered to the polymeric film layer and defining a grid, the grid having an electroconductive surface surrounding transmissive apertures, said electroconductive surface of said grid having a layer of etchant-resistant material thereon, a thin layer of electroconductive material of sufficient thickness that a portion of incident microwave energy is converted to thermal energy, said thin layer of electroconductive material overlying said grid layer and being adhered to said etchant-resistant material on said electroconductive surface and to said polymeric film in said apertures, and a substrate layer of microwave transparent material adhered to the electroconductive material layer.
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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |