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Electronic combination lock utilizing a one-time use combination

  • US RE38,147 E1
  • Filed: 10/19/1999
  • Issued: 06/17/2003
  • Est. Priority Date: 10/20/1993
  • Status: Expired due to Term
First Claim
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1. An electronic combination lock comprising:

  • an input dial for inputting numbers of a combination into said lock;

    a display for displaying numbers;

    an electronic control means for receiving said numbers of said combinations and for comparing said numbers with numbers of an authorized combination;

    said electronic control means including;

    an encrypting combination generator responsive to an entered combination for encrypting predetermined data and for generating a combination derived from said predetermined data;

    a comparator for comparing said entered combination with said generated combination and responsive to a compare equal to generate a signal permitting said lock to open, said encrypting and generating means responsive to a last accepted combination, a parameter unique to said lock, a master combination, a variable value, said variable value changed in a predictable manner upon each opening of said lock to form a result and manipulation of said result, to generate said authorized combination.

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