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Vehicle anti-theft system

  • US 3,987,408 A
  • Filed: 01/30/1973
  • Issued: 10/19/1976
  • Est. Priority Date: 01/30/1973
  • Status: Expired due to Term
First Claim
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1. An anti-theft system for a vehicle having a passenger compartment and another compartment which is normally inaccessible to a person within the passenger compartment comprising a transmitter adapted for carrying by an authorized driver and having switch means thereon, said transmitter being operative responsive to the operation of said switch means for transmitting an access identification wireless carrier signal of predetermined frequency which is modulated by a tone of predetermined frequency for identifying an authorized operator;

  • and means mounted in said inaccessible vehicle compartment, said vehicle-mounted means including means for detecting said access identification wireless carrier signal of said predetermined frequency modulated by said tone of predetermined frequency for origination within said inaccessible compartment a control signal indicative of the operation of said transmitter by a person desiring to operate the vehicle, means connected to the vehicle ignition system and being normally operative for disabling the vehicle ignition system, and means connected to said detecting means, the electrical system of the vehicle and said disabling means for inhibiting the operation of said disabling means responsive to the ignition switch of the vehicle being turned on and the initial origination of said control signal to allow the ignition system to operate and to remain operated, even after said detecting means ceases to operate, until the ignition switch is turned off.

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