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Remote sensor, device and method for activating selected remote sensor components

  • US 7,671,721 B2
  • Filed: 05/11/2004
  • Issued: 03/02/2010
  • Est. Priority Date: 05/12/2003
  • Status: Active Grant
First Claim
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1. A remote identifier that can be attached to products, which includesa microcircuit, in which there is a memory and a unit for processing a radio-frequency signal andan antenna connected to the microcircuit, for receiving both the signal and also electric power for the operating voltage of the microcircuit,an electrical component, whose electrical properties change due to the effect of infrared, or visible light, is electrically connected to the microcircuit of the remote identifier andthe microcircuit includes a system which calculates, when the remote identifier is active, the combined effect of a change in the radio-frequency signal and a signal associated with the electrical component by a correlation method, and, if a correlation is detected, the remote identifier is selected for two-way data transmission.

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