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Electronic security system

  • US 5,999,095 A
  • Filed: 05/29/1998
  • Issued: 12/07/1999
  • Est. Priority Date: 05/19/1995
  • Status: Expired due to Term
First Claim
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1. An access control system including an electronic key and plural access control devices responsive thereto, at least one of said access control devices being a controller for applying an electrical signal to an electric door lock in response to a properly authorized key, the controller also including a switching circuit for switching a control signal of an associated alarm unit to switch same between armed and dis-armed states, the system including means for preventing false alarms due to lack of synchronization between states of the door lock and the alarm unit.

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