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Electrical device

  • US 6,111,234 A
  • Filed: 11/06/1992
  • Issued: 08/29/2000
  • Est. Priority Date: 05/07/1991
  • Status: Expired due to Term
First Claim
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1. An elongate heater which passes the VW-1 flame test and which comprises(1) a core which comprises a resistive heater element which comprises a conductive polymer composition which exhibits PTC behavior;

  • (2) a first insulating jacket which(a) surrounds the core, and(b) is composed of a first insulating material comprising an organic polymer; and

    (3) a second insulating jacket which surrounds and contacts the first insulating jacket;

    the components of the heater being such that (a) a heater which is substantially identical, except that it does not contain the second insulating jacket, fails the VW-1 flame test, and (b) a heater which is substantially identical, except that it does not contain the first insulating jacket, fails the VW-1 flame test.

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