Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
June 10, 2008
Patent Application Number
11044104
Date Filed
January 27, 2005
Patent Citations Received
Patent Primary Examiner
Patent abstract
A device for monitoring distances having an interrogator and a transponder in wireless communication with the interrogator, the transponder having a signaling device that is activated based on the distance between the interrogator and transponders. The interrogator sends an encoded signal to the transponder and determines the distance to the transponder based on the delay of the transponder's response. The interrogator instructs the transponder to activate a signaling device when the distance exceeds a predetermined setting. The present invention is directed towards applications that require one-foot precision and accuracy.
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