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System for controlling access to subsystems

  • US 5,345,379 A
  • Filed: 06/17/1991
  • Issued: 09/06/1994
  • Est. Priority Date: 06/17/1991
  • Status: Expired due to Fees
First Claim
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1. A control system for limiting the operation of appliances at a first site to authorized users, the control system comprising:

  • A. a plurality of cards individually encoded with identifying information for a prospective operator of said appliances;

    B. a card reader at the first site for reading said identifying information encoded on said cards exposed thereto;

    C. a plurality of relays individually connected to said appliances and individually deployable in a first mode, wherein said relay is available for operation but not operative, and a second mode, wherein said relay operates to render its respective appliance operative;

    D. a control board for receiving authorizing information indicating those perspective operators authorized to use the appliances, for interpreting said identifying information read by said card reader relative to said authorizing information to determine whether or not the prospective operator identified by said identifying information is authorized to operate the appliances and, if so, to place one of said relays in the second mode;

    E. a computer, located at a second site remote from said first site, for receiving said authorizing information identifying prospective operators who are authorized to use said appliances and transmitting said authorizing information to said control board at the first site; and

    F. communication means linking the computer, the card reader, the control board, and the relays for supplying said authorizing information to the control board from the computer, for supplying said identifying information read by the card reader to the control board for determination of whether or not the prospective operator identified by said identifying information is authorized to operate the appliances and for placing one of said relays in the second mode upon the control board determining that said prospective operator is authorized to operate the appliances whereby said appliances are discriminately made available for operation only by authorized prospective operators.

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