Patent US5002826A successfully refreshed from Google Patents.
US5002826A
Expired / Lapsed
US
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Heaters for use in microwave ovens
Assignee: Graphic Packaging Corp
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Filing: 1988-09-01
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Granted: 1991-03-26
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Expires: 2008-09-01
Abstract
Abstract A microwave interactive coating composition and microwave reactive paper and paperboard heaters comprising the coating composition are disclosed. The coating compositions which comprise finely divided carbon, a finely divided microwave reactive metallic component, a powdered inert solid and a binder are capable of producing microwave reactive heaters comparable to those produced by vapor deposition of metals on a carrier film.
Inventors
- 👤 Kenneth A. Pollart
- 👤 Terrence P. Lafferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:38
CPC Classifications
B; B65; B65D; B65D81/00; B65D81/34; B65D81/3446; C; C09; C09D; C09D5/00; C09D5/38; H; H01; H01C; H01C7/00; H01C7/02; H01C7/027; 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; Y10T428/25; Y10T428/256; Y10T428/27; Y10T428/273; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
36 words
A microwave interactive heating element comprising a microwave transparent substrate coated with a microwave interactive coating composition comprising finely divided carbon, a finely divided microwave reactive metal, a finely divided inert solid, and a resinous binder.
Claim 2
Dependent Claim
36 words
A microwave interactive heating element comprising a microwave transparent substrate coated with a microwave interactive coating composition comprising finely divided carbon, a finely divided microwave reactive metal, a finely divided inert solid, and a resinous binder.
Claim 3
Dependent Claim
15 words
A microwave interactive structure as defined in claim 1 wherein the carbon is carbon black.
Claim 4
Dependent Claim
15 words
A microwave interactive structure as defined in claim 1 wherein the metal is aluminum flake.
Claim 5
Dependent Claim
16 words
A microwave interactive structure as defined in claim 1 wherein said substrate is paper or paperboard.
Claim 6
Dependent Claim
15 words
A microwave interactive structure as defined in claim 1 wherein said substrate is a nonwoven.
Claim 7
Dependent Claim
27 words
A microwave interactive structure as defined in claim 1 wherein said substrate is a heat stable polyester film laminated on a support structure of paper or paperboard.
Claim 8
Dependent Claim
25 words
A microwave interactive heating element as defined in claim 1 wherein said metal is selected from the group consisting of aluminum, tin, bronze and nickel.
Claim 9
Dependent Claim
17 words
A microwave interactive heating element as defined in claim 1 wherein the finely divided carbon is graphite.
Claim 10
Dependent Claim
33 words
A microwave interactive heating element as defined in claim 1 wherein the particulate inert solid is selected from the group consisting of alumina, alumina hydrate, silica, titanium oxides, aluminosilicates, clay, and calcium carbonate.
Claim 11
Dependent Claim
15 words
A microwave interactive structure as defined in claim 9 wherein said inert solid is clay.
Claim 12
Dependent Claim
34 words
A microwave interactive heating element as defined in claim 1 wherein the ratio of binder solids to other solid components of the coating composition is in the range of about 0.3 to about 1.
Claim 13
Dependent Claim
28 words
A microwave interactive heating element as defined in claim 1 wherein the relative proportions of aluminum to carbon by weight is within the range of 1:2 to 2:1.
Claim 14
Dependent Claim
39 words
A microwave interactive heating element as defined in claim 1 wherein the particulate inert solid content is in the range of from about 10 to about 35 percent by weight of the total weight of the solids in composition.
Claim 15
Dependent Claim
19 words
A microwave interactive heating element as defined in claim 1 wherein said binder is a water based latex emulsion.
Claim 16
Dependent Claim
17 words
A microwave interactive heating element as defined in claim 14 wherein said binder is an acrylic latex.
Claim 17
Dependent Claim
70 words
A microwave interactive heating element comprising paper or paperboard coated with from about 2 to about 20 pounds per 3000 square feet of a microwave interactive composition comprising from about 15 to about 30 weight percent carbon black, from about 15 to about 30 percent by weight aluminum flake, from about 10 to about 35 weight percent inert pigment and from about 30 to about 40 weight percent acrylic solids.
Claim 18
Dependent Claim
70 words
A microwave interactive heating element comprising paper or paperboard coated with from about 2 to about 20 pounds per 3000 square feet of a microwave interactive composition comprising from about 15 to about 30 weight percent carbon black, from about 15 to about 30 percent by weight aluminum flake, from about 10 to about 35 weight percent inert pigment and from about 30 to about 40 weight percent acrylic solids.
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) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |