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Electronic tether for portable objects

  • US 7,042,360 B2
  • Filed: 08/04/2004
  • Issued: 05/09/2006
  • Est. Priority Date: 06/09/2000
  • Status: Expired due to Term
First Claim
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1. An electronic tether comprising:

  • a monitoring module comprising an RFID tag adapted to receive a polling signal and to transmit a reflected signal in response to the polling signal, wherein the reflected signal comprises an identifier unique to the RFID tag; and

    an alert module consisting of;

    an RFID tag polling manager adapted to send the polling signal;

    a receiver adapted to receive the reflected signal from the RFID tag and wherein the alert module is adapted to;

    acquire the RFID tag identifier from the reflected signal;

    determine that a separation distance between the monitoring module and the alert module exceeds a preset separation distance based on the non-presence of the reflected signal from the RFID tag; and

    issue an alert when the separation distance exceeds the preset separation distance.

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