×

Electronic locking system

  • US 5,019,812 A
  • Filed: 02/27/1987
  • Issued: 05/28/1991
  • Est. Priority Date: 07/01/1985
  • Status: Expired due to Fees
First Claim
Patent Images

1. An electronic locking system comprising:

  • a conventional mechanical lock and a key for operating said lock, a code transmitter built into said key including means for transmitting coded signals in response to a code request signal when said key is used in said lock, a receiver for receiving coded signals transmitted by said code transmitter, and an electronic control unit connected to said receiver for controlling a select security function, said electronic control unit having means for transmitting code request signal to said code transmitter of said key, memory means for strong a select code signal and means for comparing a code signal received by said receiver with said stored code signal, said electronic control unit activating the select security function when said received coded signal stored therein and including seal means for preventing operation of said select security function unit said seal means has been disabled for permitting normal mechanical lock operations, disabling said seal means being effective to permit said electronic control unit to store a code signal permanently upon the first use of said key in said lock after said seal means has been disabled and when first receiving a coded signal from said receiver, said electronic control unit thereafter activating said security function only when the permanently stored code signal is received from a key used in said lock.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×