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Secure locking system

  • US 3,134,254 A
  • Filed: 01/24/1961
  • Issued: 05/26/1964
  • Est. Priority Date: 01/24/1961
  • Status: Expired due to Term
First Claim
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1. IN A LOCKING CIRCUIT INCLUDING LOCKING APPARATUS AND A REMOVABLE KEY ASSEMBLY EMBODYING AT LEAST ONE COMPLETE ELECTRONIC CIRCUIT COMPONENT OF A SPECIFIC VALUE, LOCKING APPARATUS WHICH COMPRISES:

  • AN OPEN ELECTRONIC OSCILLATOR CIRCUIT, THE RESULTING FREQUENCY OF WHICH MAY BE DETERMINED BY THE AFOREMENTIONED SPECIFIC VALUED CIRCUIT COMPONENT OF THE KEY ASSEMBLY WHEN CONNECTED THEREIN TO CLOSE SAID OSCILLATOR CIRCUIT;

    CONTACT MEANS REMOVABLY ENGAGEABLE BY THE KEY ASSEMBLY FOR ELECTROCONDUCTIVELY CONNECTING THE SAID ELECTRONIC COMPONENT OF THE KEY ASSEMBLY INTO SAID OSCILLATOR CIRCUIT, A SPECIFIC OSCILLATOR FREQUENCY THEREBY RESULTING;

    FREQUENCY DISCRIMINATING MEANS RESPONSIVE ONLY TO SIGNALS OF SAID SPECIFIC RE-

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