Method and apparatus for tracking and locating a moveable article
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United States of America Patent
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-
Nov 12, 2002
Grant Date -
Nov 15, 2001
app pub date -
Apr 3, 2001
filing date -
May 24, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Tracking of an article through geographic areas using electromagnetic signals, specifically radio frequency (RF) signals. The article contains a tag operating as a transmitter and receiver. Tag-readers in the defined geographic areas transmit RF signals and in response, the tag transmits RF signals received by the tag-reader. By knowing the areas in which the tag-readers are located, a system tracks the article by monitoring the tag-readers communicating with the tag.
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