US4943456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave reactive heater
Assignee: Graphic Packaging International LLC
•
Filing: 1989-08-30
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Granted: 1990-07-24
•
Expires: 2009-08-30
Abstract
Abstract Microwave responsive heaters and packages for food products and the like containing the heaters are disclosed in which the heaters consist of a microwave reactive coating composition on a heat stable substrate which is pattern bonded to a surface to be heated by microwave radiation.
Inventors
- 👤 Kenneth A. Pollart
- 👤 Terrence P. Lafferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:59
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/027; B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; C; C09; C09D; C09D5/00; C09D5/38; B65D2581/00; B65D2581/34; B65D2581/3437; B65D2581/3439; B65D2581/3447; B65D2581/3448; B65D2581/3463; B65D2581/3464; B65D2581/3471; B65D2581/3472; B65D2581/3479; B65D2581/3483; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/1307; Y10T428/31504; Y10T428/31551; Y10T428/31591; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31703; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
58 words
In an article having a microwave reactive heater comprising a heat stable substrate with a microwave interactive surface coating thereon comprising finely divided carbon, a finely divided microwave reactive metal, clay, and a dielectric organic solid binder, the improvement which comprises laminating with an adhesive the microwave heater surface to a surface of the article to be heated.
Claim 2
Dependent Claim
58 words
In an article having a microwave reactive heater comprising a heat stable substrate with a microwave interactive surface coating thereon comprising finely divided carbon, a finely divided microwave reactive metal, clay, and a dielectric organic solid binder, the improvement which comprises laminating with an adhesive the microwave heater surface to a surface of the article to be heated.
Claim 3
Dependent Claim
37 words
A heater as defined in claim 1 wherein the adhesive pattern extends over the entire heater surface and the adhesive covers from about 5 to about 50 percent of the area of the microwave interactive heater surface.
Claim 4
Dependent Claim
18 words
A heater as defined in claim 1 wherein the adhesive is in the form of a spot pattern.
Claim 5
Dependent Claim
18 words
A heater as defined in claim 1 wherein the adhesive is in the form of a grid pattern.
Claim 6
Dependent Claim
38 words
A heater as defined in claim 4 wherein the adhesive grid pattern extends over the entire surface of the heater and the adhesive covers from about 30 to about 50 percent of the area of the heater surface.
Claim 7
Dependent Claim
63 words
In a paper or paperboard container having a microwave reactive heater comprising a heat stable substrate with a microwave surface coating thereon comprising finely divided carbon, a finely divided microwave reactive metal, clay, and a dielectric organic solid binder, the improvement which comprises laminating the microwave heater surface to the paper or paperboard container with an adhesive in a partial area coverage pattern.
Claim 8
Dependent Claim
63 words
In a paper or paperboard container having a microwave reactive heater comprising a heat stable substrate with a microwave surface coating thereon comprising finely divided carbon, a finely divided microwave reactive metal, clay, and a dielectric organic solid binder, the improvement which comprises laminating the microwave heater surface to the paper or paperboard container with an adhesive in a partial area coverage pattern.
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) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |