Self regulating laminar heating device and method of forming same
OwnerJack H. Smucklerinventor
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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.
Claims9
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.degree. F. to about 80.degree. 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.
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.degree. F. to about 80.degree. F.;
- and (ii) two or more spaced apart electrodes disposed in contact with the dried resistive coating.
Dependencies are inferred from the claim text.