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Apparatus and method for detecting the condition of an item

  • US 20020080045A1
  • Filed: 12/27/2001
  • Published: 06/27/2002
  • Est. Priority Date: 06/28/1999
  • Status: Active Grant
First Claim
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1. Apparatus for detecting a specific condition of an item, the apparatus comprising:

  • a structure for radiating radio frequency energy in response to the reception by said structure of radio frequency energy;

    said structure having a first configuration which, in use, is changed to a second configuration in response to said item attaining said specific condition;

    said change in configuration producing a detectable difference in radio frequency energy radiated from said structure.

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