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Vehicle alarm system

  • US 5,850,173 A
  • Filed: 10/15/1996
  • Issued: 12/15/1998
  • Est. Priority Date: 10/21/1993
  • Status: Expired due to Term
First Claim
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1. A vehicle security system having a settable armed state and a settable disarmed state, said vehicle including an ignition having an on state and an off state and a switch that initiates passive arming of the vehicle security system, said security system comprising:

  • a first sensor adapted to detect said disarmed state;

    a second sensor adapted to detect the state of the vehicle'"'"'s ignition;

    a third sensor adapted to detect the state of the passive arming switch;

    an elapsed-time clock providing a first and a second signal at end of respective first and second predetermined time periods, said second time period being longer than said first time period;

    a first device connected to said clock and to said first and second sensors so as to respond to said system being disarmed and said ignition changing from an on to an off ignition state by starting said elapsed-time clock; and

    a second device responsive to said signal produced by said clock upon reaching the end of said second time period for setting said system in the armed state, and responsive to said third sensor and to said signal produced by said clock upon reaching the end of said first time period so as to respond to the actuation of said passive arming switch when said passive arming switch is actuated before the end of said first time period by setting said security system in the armed state.

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