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Electronic tether for portable objects

  • US 7,064,669 B2
  • Filed: 04/27/2004
  • Issued: 06/20/2006
  • Est. Priority Date: 06/09/2000
  • Status: Expired due to Term
First Claim
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1. An electronic tether for an animal comprising:

  • an animal worn monitoring module comprising a portable transmitter adapted for transmitting a signal, wherein monitoring module further comprises a first clock and the audio signal comprising a first clock time T1 as measured by the first clock at the time of transmission of the signal; and

    an alert module comprising a receiver wirelessly connected to the portable transmitter and a second clock, wherein the receiver is adapted to receive the signal from the transmitter, wherein the first clock and the second clock are referenced to a common time T0 and wherein the alert module is adapted to;

    receive the signal from the monitoring module, wherein the signal is received at time T2;

    determine a signal propagation time indicative of the time for the signal to reach the alert module from the monitoring module, wherein the signal propagation time is equal to T2=T1;

    determine a separation distance between the animal worn monitoring module and the alert module based on the propagation time and a propagation speed of the signal, andissue an alert when the separation distance exceeds a predetermined threshold.

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