×

Library check out/check in system

  • US 5,288,980 A
  • Filed: 06/25/1992
  • Issued: 02/22/1994
  • Est. Priority Date: 06/25/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. A self check out/check in system which includes a terminal for independently withdrawing or returning articles having duplicate article identifying indicia on opposing planar surfaces thereof, and alterable security indicia disposed on the article for indicating the circulation status of the article, the system comprising:

  • first and second readers disposed at spaced opposed locations on opposite sides of the article, said first and second readers being operative to substantially simultaneously read both article identifying indicia and for generating first and second article identifying signals in response thereto;

    processing circuitry in electrical communication with said first and second readers, said processing circuitry including comparator circuitry for receiving said first and second article identifying signals and for generating a third signal when said first and second article identifying signals are substantially identical; and

    security indicia control circuitry for altering the security indicia in response to said third signal.

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