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Access control device featuring key ordering or key simultaneity

  • US 5,705,991 A
  • Filed: 06/07/1995
  • Issued: 01/06/1998
  • Est. Priority Date: 01/09/1992
  • Status: Expired due to Fees
First Claim
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1. In a method of operating a secure entry system, the system including an electronic lock and a plurality of electronic keys, the method including using each of the keys individually at different times to effect a plurality of openings of said lock, an improvement comprising establishing an order (KEY{1}, KEY{2}, . . . KEY{N}) by which the keys are to access the electronic lock, and denying lock access to any key KEY{J}, where 1<

  • J≦

    N, that is presented to the lock without each of keys KEY{1} through KEY{J-1} having been first presented thereto in said established order.

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