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Automotive anti-theft device

  • US 4,672,225 A
  • Filed: 01/09/1986
  • Issued: 06/09/1987
  • Est. Priority Date: 01/09/1986
  • Status: Expired due to Term
First Claim
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1. An anti-theft device for a vehicle starter ignition system, comprising:

  • switch means coupled with said starter ignition system for interrupting the flow of electrical current through said starter ignition system;

    a resistive element having a resistive value unique to said device;

    means for removably mounting said resistive element on said vehicle to allow the vehicle'"'"'s operator to remove said resistive element from the vehicle in order to prevent theft of said vehicle; and

    a control circuit coupled between said switch means and said resistive element for sensing the value of said resistive element when the latter is mounted on said vehicle and for controlling said switch means in accordance with the sensed value of resistance, said control circuit including a comparator circuit for comparing the sensed value of said resistive element with two reference values.

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