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Identification system

  • US 4,818,855 A
  • Filed: 01/07/1986
  • Issued: 04/04/1989
  • Est. Priority Date: 01/11/1985
  • Status: Expired due to Term
First Claim
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1. In a remotely powered portable member having circuitry for storing and transmitting coded information, the improvement comprising:

  • first coupling means for receiving a signal of a predetermined frequency transmitted via one of a magnetic field and an electric field;

    power means connected to said first coupling means for deriving operating power from the received signal for use by said circuitry;

    circuit means connecting said circuitry to said first coupling means, for utilizing said predetermined frequency as a clock signal for timing of said circuitry; and

    second coupling means connected to said circuitry for transmitting coded information stored by said circuitry via the other one of the magnetic field and the electric field.

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