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Programmable vehicle anti-theft system

  • US 4,990,906 A
  • Filed: 11/29/1988
  • Issued: 02/05/1991
  • Est. Priority Date: 11/29/1988
  • Status: Expired due to Term
First Claim
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1. A programmable security system for a device having a lock operable by a key, comprising erasable memory means for storing a code associated with a valid key and for storing a key status code indicative of whether the previous attempt to operate the lock was initiated with a valid key or an invalid key, means for reading an input key code in response to a predetermined step in the operation of the lock by said key, means for comparing the input key code with the stored key code to permit operation of the device when the input key code matches the stored key code and the key status code indicates that the previous attempt to operate the lock was initiated with a valid key.

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