US4835352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Package material for microwave cooking
Assignee: Toppan Inc
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Filing: 1987-11-02
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Granted: 1989-05-30
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Expires: 2007-11-02
Abstract
Abstract The present application is directed to a package material for microwave cooking which is obtained by integrally laminating a microwave heating element, which generates heat when irradiated with microwave, to a base material to form a sheet; and providing, on the sheet, many slits in the form of broken lines, in parallel, and in alternation between the adjacent ones.
Inventors
- 👤 Hiroaki Sasaki
- 👤 Minoru Toyoda
- 👤 Jun Sada
- 👤 Sueo Takahashi
- 👤 Shigeru Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; B65D81/3461; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/3452; B65D2581/3463; B65D2581/3466; B65D2581/3471; B65D2581/3472; B65D2581/3486; B65D2581/3494; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A package material for packages which are adapted to tightly and conformably wrap about a food for microwave irradiation, said package material comprising, at least one heating element integrally laminated to a base material to form a sheet, said at least one heating element being composed of a metallic layer which is formed by the vacuum vapor deposition of a metal and which generates heat on the absorption of microwave, and a heat-resistant plastic film layer with which said metallic layer is covered; and providing, on said sheet, many slits in the form of broken lines, in parallel, and in alternation between adjacent slits.
Claim 2
Dependent Claim
104 words
A package material for packages which are adapted to tightly and conformably wrap about a food for microwave irradiation, said package material comprising, at least one heating element integrally laminated to a base material to form a sheet, said at least one heating element being composed of a metallic layer which is formed by the vacuum vapor deposition of a metal and which generates heat on the absorption of microwave, and a heat-resistant plastic film layer with which said metallic layer is covered; and providing, on said sheet, many slits in the form of broken lines, in parallel, and in alternation between adjacent slits.
Claim 3
Dependent Claim
24 words
A package material for microwave cooking according to claim 1 wherein two heating elements are laminated to the opposite surfaces of said base material.
Claim 4
Dependent Claim
23 words
A package material for microwave cooking according to claim 1 wherein two heating elements are laminated to one surface of said base material.
Claim 5
Dependent Claim
21 words
A package material for microwave cooking according to claim 1 wherein said base material is paper and said metal is aluminum.
References Cited (Backward Citations)
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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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |