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Self limiting microwave heaters

  • US 5,410,135 A
  • Filed: 05/21/1993
  • Issued: 04/25/1995
  • Est. Priority Date: 09/01/1988
  • Status: Expired due to Fees
First Claim
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1. A self-limiting dispersion of a conductive material in a binder where said conductive material consists essentially of a carbon material having a structure selected to have a percolation threshold when dispersed in said binder at a concentration of from about 10 weight percent to about 45 weight percent in said binder, said binder comprising a thermoplastic material selected to go through a first order phase transition or a second order phase transition at a temperature from about 300°

  • F. to about 480°

    F. and said dispersion being near the percolation threshold so that its electrical conductivity drops at least about 1.5 orders of magnitude when above the binder phase transition temperature wherein said conductive material combined with said binder has a surface resistivity ranging from about 25 ohms per square to about 100,000 ohms per square at room temperature.

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