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Object identification system

  • US 4,121,102 A
  • Filed: 07/27/1976
  • Issued: 10/17/1978
  • Est. Priority Date: 07/27/1976
  • Status: Expired due to Term
First Claim
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1. A system for remotely identifying an object including a transponder associated with the object to be identified and containing information identifying said object and an interrogator for determining the identification of said object, the improvement wherein:

  • said interrogator is operative to transmit an interrogator signal having a predetermined clock frequency and to detect signals from said transponder representative of said identifying information; and

    said transponder includes resonating means adapted to resonate at said clock frequency and to provide an output signal which at least initially increases in amplitude as pulses are repetitively received at said clock frequency, said resonating means being relatively non-responsive to pulses at frequencies other than said clock frequency, said transponder also including threshold means being responsive to a predetermined amplitude of said resonating means output signal attained only after a plurality of said repetitive pulses at said clock frequency are received by said resonating means to cause said transponder to transmit at said clock frequency in response to the receipt of said interrogator signal a sequence of transponder pulses representing in signal form said identifying information.

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