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Programmable object identification transponder system

  • US 5,144,314 A
  • Filed: 12/11/1991
  • Issued: 09/01/1992
  • Est. Priority Date: 10/23/1987
  • Status: Expired due to Term
First Claim
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1. A transponder comprising:

  • a means for demodulating a received signal to produce a data signal in which each data character is encoded as a pair of different signal levels;

    an instruction decoder for detecting an operation instruction in the data signal;

    a means for storing indicium of each signal level of the data signal, and having one mode of operation in which the indicia of each signal level is written into said means for storing in response to a signal from said instruction decoder, and having another mode of operation in which previously stored indicia are read from said means for storing;

    a modulator for modulating a carrier signal in response to he indicia read from said means for storing; and

    means for powering the transponder with energy from the received signal.

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