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Electric resistance heater

  • US 4,912,306 A
  • Filed: 03/13/1989
  • Issued: 03/27/1990
  • Est. Priority Date: 07/14/1987
  • Status: Expired due to Term
First Claim
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1. An electrical heating device comprising:

  • (a) a substrate having at least one electrically insulating surface;

    (b) a semi-conductor pattern comprising a semi-conductor ink deposited on said electrically insulating surface, said pattern including a pair of spaced-apart conductor contact portions and a heating portion extending between and electrically connected to said conductor contact portions; and

    ,(c) a pair of conductors, each of said conductors having a resistance less than that of said heating and conductor contact portions and being in direct electrical engagement with one of said conductor contact portions,said heating device being characterized in that each of said conductors comprises a conductive ink deposited in registration with said conductor contact portions after said semi-conductor ink has been deposited on said substrate to provide said semi-conductor pattern, and in that said conductive ink migrates into said conductor contact portions.

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