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Radio frequency identification transponder with electronic circuit enabling/disabling capability

  • US 5,874,902 A
  • Filed: 07/29/1996
  • Issued: 02/23/1999
  • Est. Priority Date: 07/29/1996
  • Status: Expired due to Term
First Claim
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1. A radio frequency (RF) tag for connection to an external electrical circuit, the RF tag having an antenna for receiving an RF signal to be sent to the RF tag upon authorized transfer of possession of the external circuit, a radio frequency section for demodulating the RF signal to create a demodulated RF signal, and a memory, the tag further comprising:

  • a logic that puts data in the memory in response to the demodulated RF signal; and

    a circuit enabler/disabler that accesses the data in the memory, and enables the external electrical circuit to fully function only when the RF tag has received the RF signal to be sent to the RF tag upon authorized transfer of possession of the external circuit by perturbing a critical part of the external electrical circuit through a connection when the data in the memory satisfies certain conditions.

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