Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kentaro Hara0
Date of Patent
May 29, 2007
Patent Application Number
09941732
Date Filed
August 30, 2001
Patent Citations Received
Patent Primary Examiner
Patent abstract
A stationary device 20 sends a portable-device finding signal to a portable device 10 from a plurality of stationary-device side antennae 24 and 25, which are located at different positions. Upon receipt of the portable-device finding signal from the stationary device 20, the portable device 10 sends a reception intensity data signal to the stationary device 20. The stationary device 20 determines the current position of the portable device 10 by using reception intensity data of the portable-device finding signals, which are received at the stationary-device side antennae, from the portable device 10.
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