Detection of multiple articles

  • US 5,726,630 A
  • Filed: 12/29/1995
  • Issued: 03/10/1998
  • Est. Priority Date: 11/18/1992
  • Status: Expired due to Term
First Claim
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1. An identification system comprising:

  • an interrogator; and

    a plurality of transponders;

    the interrogator comprising;

    transmitter means for transmitting an interrogation signal to a plurality of transponders,receiver means for receiving a respective plurality of response signals from the plurality of transponders, andmeans for identifying the plurality of transponders from the respective plurality of response signals,the interrogator being capable of disabling any of the plurality of transponders;

    each of the plurality of transponders comprising;

    receiving means, andtransmitting means,whereby, on receipt of the transmitted interrogation signal, the transponder transmits a response signal;

    wherein the interrogator transmits at least two intermittent interrogation signals, with an interval between successive interrogation signals which is less than a minimum period within which transponders which have been disabled reset themselves automatically.

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