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Enhanced identification system

  • US 6,661,336 B1
  • Filed: 10/12/1999
  • Issued: 12/09/2003
  • Est. Priority Date: 05/14/1997
  • Status: Expired due to Term
First Claim
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1. An identification system comprising:

  • a reader including a transmitter for transmitting a reader signal; and

    a plurality of transponders, each transponder including a receiver for receiving the reader signal and a transmitter for generating a transponder signal, whereby upon recognising a transponder signal from a said transponder the reader immediately issues a mute instruction, muting all other active transponders and passing control to the said transponder, without the need for a specifically timed acknowledgement to the said controlling transponder, the reader issues an acceptance instruction after the controlling transponder signal has been successfully received by the reader, the acceptance instruction being a modification of the reader signal, wherein the modification of the reader signal occurs immediately after successful identification of the controlling transponder signal, the modification of the reader signal always occurring for a period shorter than the length of the controlling transponder signal.

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