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Self regulating laminar heating device and method of forming same

  • US 5,206,482 A
  • Filed: 01/23/1992
  • Issued: 04/27/1993
  • Est. Priority Date: 11/08/1990
  • Status: Expired due to Fees
First Claim
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1. 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.

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