Patent US3280520A successfully refreshed from Google Patents.
US5206482A
Expired / Lapsed
US
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Self regulating laminar heating device and method of forming same
Assignee: Individual
•
Filing: 1992-01-23
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Granted: 1993-04-27
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Expires: 2012-01-23
Abstract
Abstract A positive temperature coefficient coating or layer is produced by applying to a substrate a composition containing a dispersion of conductive particles in a solution of a solvate or solvatable crystalline organic polymer. The coating or layer so formed can be incorporated into temperature self-regulating heating devices.
Inventors
- 👤 Jack H. Smuckler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:40
CPC Classifications
B; B60; B60R; B60R1/00; B60R1/02; B60R1/06; B60R1/0602; B60S; B60S1/00; B60S1/02; B60S1/023; B60S1/026; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/146; H05B3/84; H05B3/845
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A heated mirror assemble comprising: a. a reflective mirror; b. a temperature self-regulating positive temperature coefficient material in thermal communication with said mirror, said material formed by applying to a non-reflective side of the mirror a composition comprising a dispersion of electrically conductive particulate material in a solution of a crystalline polyurethane or crystalline polychloroprene polymer comprising at least 10% by weight of the polymer, which solution is stable at a temperature in the range of from about 60° F. to about 80° F.; and c. a plurality of electrodes disposed in contact with said positive temperature coefficient material spaced apart at a distance to permit current flow between the electrodes through the material at a temperature below its switching temperature.
Claim 2
Dependent Claim
121 words
A heated mirror assemble comprising: a. a reflective mirror; b. a temperature self-regulating positive temperature coefficient material in thermal communication with said mirror, said material formed by applying to a non-reflective side of the mirror a composition comprising a dispersion of electrically conductive particulate material in a solution of a crystalline polyurethane or crystalline polychloroprene polymer comprising at least 10% by weight of the polymer, which solution is stable at a temperature in the range of from about 60° F. to about 80° F.; and c. a plurality of electrodes disposed in contact with said positive temperature coefficient material spaced apart at a distance to permit current flow between the electrodes through the material at a temperature below its switching temperature.
Claim 3
Dependent Claim
27 words
The mirror assembly of claim 1 wherein the electrical heating element further comprises a laminar insulating sheet disposed between the positive temperature coefficient material and the mirror.
Claim 4
Dependent Claim
15 words
The mirror assembly of claim 1 wherein the electrically conductive particulate material comprises carbon black.
Claim 5
Dependent Claim
20 words
The mirror assembly of claim 1 further comprising a housing for attachment of the mirror assembly to a motor vehicle.
Claim 6
Dependent Claim
92 words
A temperature self-regulating laminar heating device comprising (i) a dried resistive coating disposed on a laminar insulating sheet, wherein the coating is formed by applying to the insulating sheet a composition comprising a dispersion of conductive particles in a solution of a crystalline polyurethane or crystalline polychloroprene polymer comprising at least 10% by weight of the polymer, which solution is stable at a temperature in the range of from about 60° F. to about 80° F.; and (ii) two or more spaced apart electrodes disposed in contact with the dried resistive coating.
Claim 7
Dependent Claim
92 words
A temperature self-regulating laminar heating device comprising (i) a dried resistive coating disposed on a laminar insulating sheet, wherein the coating is formed by applying to the insulating sheet a composition comprising a dispersion of conductive particles in a solution of a crystalline polyurethane or crystalline polychloroprene polymer comprising at least 10% by weight of the polymer, which solution is stable at a temperature in the range of from about 60° F. to about 80° F.; and (ii) two or more spaced apart electrodes disposed in contact with the dried resistive coating.
Claim 8
Dependent Claim
25 words
The laminar heating device of claim 5 wherein the crystalline polymer has a degree of crystallinity of at least 5% as determined by x-ray diffraction.
Claim 9
Dependent Claim
14 words
The laminar heating device of claim 5 wherein the conductive particles are carbon black.
Claim 10
Dependent Claim
19 words
The laminar heating device of claim 5 wherein the conductive particles are a blend of carbon black and graphite.
Claim 11
Dependent Claim
29 words
The resistive coating of claim 7 wherein the conductive particles comprise low structure carbon black particles having a DBP absorption of less than 100 cc/100 g of carbon black.
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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) | 1996-04-26 | 1996-10-26 | 1997-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-26 | 2000-10-26 | 2001-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-26 | 2004-10-26 | 2005-04-27 | $7700.00 | Window Closed / Lapsed |