US4623565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated microwave cookware
Assignee: EIDP Inc
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Filing: 1985-05-30
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Granted: 1986-11-18
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Expires: 2005-05-30
Abstract
Abstract An article of microwave cookware with a thermoset polyester substrate coated with an epoxy primer and a silicone resin topcoat which has two silicone resins with different methyl:phenyl ratios, one higher and the other lower to optimize both hardness and non-stick characteristics of the coating.
Inventors
- 👤 Jozef T. Huybrechts
- 👤 Lawrence W. McKeen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:04
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; A47J36/027; A47J36/04; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1372; Y10T428/25; Y10T428/251; Y10T428/29; Y10T428/2911; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31652; Y10T428/31663; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
An article of cookware comprising a substrate of thermoset polyester coated with a multilayer coating, wherein the coating consisting essentially of a primer layer consisting essentially of epoxy resin, crosslinker resin, curing catalyst, and up to an effective amount of pigmentation, and a topcoat layer consisting essentially of two silicone resins, curing catalyst, and pigmentation, the first of said silicone resins having a methyl:phenyl molar ratio in the range of 1:1 to 1:1.25, and the second of said silicone resins having such a ratio in the range of 1:1.75 to 1:2.25, and the proportions by weight of said first and second resins being in the range of 67-88% second resin, balance first resin.
Claim 2
Dependent Claim
113 words
An article of cookware comprising a substrate of thermoset polyester coated with a multilayer coating, wherein the coating consisting essentially of a primer layer consisting essentially of epoxy resin, crosslinker resin, curing catalyst, and up to an effective amount of pigmentation, and a topcoat layer consisting essentially of two silicone resins, curing catalyst, and pigmentation, the first of said silicone resins having a methyl:phenyl molar ratio in the range of 1:1 to 1:1.25, and the second of said silicone resins having such a ratio in the range of 1:1.75 to 1:2.25, and the proportions by weight of said first and second resins being in the range of 67-88% second resin, balance first resin.
Claim 3
Dependent Claim
13 words
The article of claim 1 wherein the polyester substrate is reinforced with fiberglass.
Claim 4
Dependent Claim
13 words
The article of claim 1 which is adapted for use in microwave ovens.
Claim 5
Dependent Claim
17 words
The article of claim 1 wherein the crosslinker resin in the primer layer is a benzoguanamine formaldehyde.
Claim 6
Dependent Claim
12 words
The article of claim 1 wherein the topcoat contains pigment-coated mica flake.
Claim 7
Dependent Claim
48 words
The article of claim 1 wherein said ratio of first resin is in the range of 1:1.05 to 1:1.2, said ratio of said second resin is in the range of 1:1.85 to 1:2.0, and said proportions are in the range of 75 to 85% of said second resin.
Claim 8
Dependent Claim
105 words
The article of claim 1 adapted for use in microwave ovens wherein the polyester resin is reinforced with fiberglass and the primer layer contains epoxy resin, benzoguanamine-formaldehyde resin crosslinker, docecylbenzene sulfonic acid catalyst and pigmentation, and the topcoat layer contains two silicone resins in proportion by weight of about 15 to 25% of a first resin which has a methyl to phenyl molar ratio in the range of 1:1.05 to 1:1.2 and 85 to 75% of a second resin having such a ratio in the range of 1:1.85 to 1:2.0, said topcoat layer also containing butyl titanate and zinc octoate catalysts and pigment-coated mica flake.
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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |