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Integrated circuits with persistent data storage

  • US 8,464,957 B2
  • Filed: 10/18/2011
  • Issued: 06/18/2013
  • Est. Priority Date: 05/31/2001
  • Status: Expired due to Term
First Claim
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1. A method for a radio frequency identification (RFID) tag comprising:

  • receiving a first code transmitted by an RFID reader, the first code generated by an XOR calculation;

    comparing a second code within the tag to the first code;

    andif the first code and second code match, transmitting by the tag a third code to the RFID reader.

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