US4629756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat reflective polymer blends
Assignee: EIDP Inc
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Filing: 1985-11-04
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Granted: 1986-12-16
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Expires: 2005-11-04
Abstract
Abstract A radiant heat reflective composition comprising a blend of a tetrafluoroethylene copolymer and copper flake.
Inventors
- 👤 Dewey L. Kerbow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:55
CPC Classifications
H; H10; H10W; H10W42/00; H10W42/20; A; A62; A62D; A62D5/00; C; C08; C08K; C08K3/00; C08K3/02; C08K3/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
A composition comprising (a) a thermoplastic tetrafluoroethylene copolymer of film-forming molecular weight and (b) 0.5 to 10 percent by weight, based on weight of copolymer and copper flake, of copper flake having a number average particle size of between 2 and 250 micrometers and an aspect ratio greater than 4:1.
Claim 2
Dependent Claim
50 words
A composition comprising (a) a thermoplastic tetrafluoroethylene copolymer of film-forming molecular weight and (b) 0.5 to 10 percent by weight, based on weight of copolymer and copper flake, of copper flake having a number average particle size of between 2 and 250 micrometers and an aspect ratio greater than 4:1.
Claim 3
Dependent Claim
22 words
The composition of claim 1 in which the average number particle size of the copper flake is between 4 and 50 microns.
Claim 4
Dependent Claim
17 words
The composition of claim 1 which the aspect ratio of the copper is between 20:1 and 40:1.
Claim 5
Dependent Claim
18 words
The composition of claim 3 in which the aspect ratio of the copper is between 20:1 and 40:1.
Claim 6
Dependent Claim
13 words
The composition of claim 1 wherein the tetrafluoroethylene copolymer contains units of ethylene.
Claim 7
Dependent Claim
16 words
The composition of claim 1 wherein the amount of b) present is between 1 and 6%.
Claim 8
Dependent Claim
14 words
A composition of claim 1 in the form of an extruded or molded article.
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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |