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Plastic resistance elements and methods for making same

  • US 3,351,882 A
  • Filed: 10/09/1964
  • Issued: 11/07/1967
  • Est. Priority Date: 10/09/1964
  • Status: Expired due to Term
First Claim
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1. AN ELECTRICAL ELEMENT COMPRISING OF NORMAL SOLID FIRM THERMOPLASTIC POLYMER MATERIAL CAPABLE OF BEING CROSS-LINKED AND THEREBY TO RESIST SOFTENING THEREOF AT INCREASED TEMPERATURES, SAID ELEMENT ALSO EMBODYING PARTICLES LENDING LIMITED CONDUCTIVE PROPERTIES THERETO, SAID PARTICLES HAVING A SUFFICIENTLY SMALLER TEMPERATURE COEFFICIENT OF EXPANSION THAN SAID POLYMER TEMPERATURE WHEREBY SAID PROPERTIES ARE ABRUPTLY DIMINISHED UPON REACHING A PREDETERMINED TEMPERATURE, AND ELECTRICAL CIRCUIT TERMINALS FOR SAID ELEMENT IN THE FORM OF "MESHED" CONDUCTIVE MATERIAL OF SUBSTANTIAL AREA EMBEDDED IN SAID POLYMER MATERIAL, SAID TERMINALS EXTENDING ALONG APPROXIMATELY "EQUAL POTENTIAL SURFACES" TRANSVERSELY OF THE PATHS OF CURRENT FLOW BETWEEN THE TERMINALS THROUGH THE ELEMENT, SAID POLYMER MATERIAL, AT LEAST AT THE REGION OF SAID TERMINALS, BEING CROSS-LINKED WITH THE TERMINALS IN SITU.

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