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System for tracking possessions

  • US 6,570,504 B2
  • Filed: 09/17/2001
  • Issued: 05/27/2003
  • Est. Priority Date: 08/12/1998
  • Status: Expired due to Fees
First Claim
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1. A system for detecting the presence of at least one object, comprising:

  • at least one child unit attached to an object to be detected, the at least one child unit having a first communicating device for sending a locator signal and for receiving a control signal;

    a parent unit having a second communicating device for receiving the locator signal from the at least one child unit, a processor for determining whether the at least one child unit is within a preselected range based upon the signal received from the first communicating device of the child unit, an alarm triggered by the processor when the processor determines that the at least one child unit is beyond the preselected range, and controls for controlling at least one function of the parent unit; and

    a first global positioning device associated with the parent unit and a second global position device associated with the at least one child unit for providing relative global positions of the child unit and the parent unit to allow the processor to determine the distance between the parent unit and the at least one child unit.

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