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Method and device for electronic identification

  • US 5,557,085 A
  • Filed: 09/06/1994
  • Issued: 09/17/1996
  • Est. Priority Date: 01/20/1992
  • Status: Expired due to Term
First Claim
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1. An electronic identification device, comprising:

  • means for generating and transmitting an electromagnetic field;

    a plurality of transponder units, each of which including storing means for storing identification data, and transmitter means for transmitting a signal comprising said identification data when each of said transponder units has been exposed to said electromagnetic field;

    receiver means for receiving said signal and for decoding said identification data;

    at least one element made of a material, having at least one of a magnetic property and electric property being affected by an external magnetic field, being arranged within said transponder unit;

    means for generating said magnetic field being provided at an interrogation zone to affect elements located in said interrogation zone; and

    processing means being provided in said transponder unit for modifying said signal in dependence of the magnetic field affecting said at least one element.

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