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PTC circuit protector having parallel areas of effective resistance

  • US 7,119,655 B2
  • Filed: 11/29/2004
  • Issued: 10/10/2006
  • Est. Priority Date: 11/29/2004
  • Status: Expired due to Fees
First Claim
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1. A circuit protection device comprising:

  • a polymeric resistor element that undergoes changes to its electrical resistance in response to temperature, said resistor element having a first surface and a second surface;

    a first electrode in electrical contact with said first surface; and

    a second electrode in electrical contact with said second surface;

    said first electrode and said second electrode in electrical connection with each other by way of said polymeric resistor element;

    said polymeric resistor element has a first area of effective resistance and a second area of effective resistance, said first area of effective resistance is electrically in parallel with said second area of effective resistance;

    wherein said first and said second areas of effective resistance combine to comprise more than about half of said polymeric resistor element.

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