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Electronic apparatus including a device for preventing loss or theft

  • US 6,956,480 B2
  • Filed: 02/20/2003
  • Issued: 10/18/2005
  • Est. Priority Date: 06/16/2000
  • Status: Expired due to Term
First Claim
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1. A communication unit including a device for preventing loss or theft of the unit, the device receiving and assessing an enabling signal comprising identity information from an external source, and controlling operation of the communication unit in dependence upon the assessment, the device measuring signal strength of the enabling signal and examining the identity information included in the enabling signal, triggering a first alarm if the enabling signal strength is below a first predetermined level and triggering a second alarm if the enabling signal strength is below a second predetermined level that is lower than the first predetermined level, with the alarms perceptibly indicating different alarm conditions, wherein the device determines whether the identity information correctly enables operation of the unit only if signal strength of the enabling signal is above the second predetermined level, and wherein the unit is not inoperable until the unit is enabled.

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