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RFID tag with visual environmental condition monitor

  • US 7,209,042 B2
  • Filed: 12/20/2004
  • Issued: 04/24/2007
  • Est. Priority Date: 12/20/2004
  • Status: Active Grant
First Claim
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1. An RFID tag intended to be associated with a host product, the RFID tag comprising:

  • a) a data memory to receive data regarding the host product;

    b) a transponder to transmit data in the data memory to an external RF interrogator in response to interrogation; and

    c) a nonelectric visually readable environmental-condition exposure indicator, the visual indicator being capable of sensing exposure of the RFID tag to an environmental condition experienced by the host product and of providing a visual indication readable externally of the RFID tag of the sensed environmental condition.

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