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Anti-frost system for a windshield of a motor vehicle

  • US 4,902,874 A
  • Filed: 10/20/1988
  • Issued: 02/20/1990
  • Est. Priority Date: 10/28/1987
  • Status: Expired due to Term
First Claim
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1. A system for preventing frost from accumulating on a window of a motor vehicle comprising;

  • a heating element provided on the window;

    a manual switch;

    a temperature switch closing when the temperature of the window is lower than 0°

    C.;

    a humidity switch closing when the humidity of air outside of the window becomes slightly lower than 100% relative humidity; and

    an electric circuit connecting the heating element, manual switch, temperature switch and humidity switch to a battery in series.

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