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Transaction system

  • US 4,845,347 A
  • Filed: 04/08/1986
  • Issued: 07/04/1989
  • Est. Priority Date: 04/10/1985
  • Status: Expired due to Term
First Claim
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1. A transmission system including a terminal;

  • a token having an on-board data processing capability;

    means for inductively coupling the token with the terminal to permit data communication therebetween and means associated with the terminal for transmitting a carrier signal and for detecting a variation in the power demand on the carrier signal which is indicative of the presence of an inductively coupled token.

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