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Tag interrogation with observable response signal

  • US 7,109,865 B2
  • Filed: 09/26/2002
  • Issued: 09/19/2006
  • Est. Priority Date: 09/26/2002
  • Status: Active Grant
First Claim
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1. A method of discriminating among similar items, the method comprising the steps of:

  • a. associating each of the items with a device responsive to an optical signal encoding information specific to the item, wherein each of the devices responds to a differently modulated optical signal; and

    b. exposing the items to a modulated optical signal encoding information corresponding to a selected one of the items, the exposure causing the device associated with the item, but not the devices associated with other items, to cause impartation of an observable signal.

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