Method and apparatus for tracking mobile devices using tags
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 13, 2004
Grant Date -
May 16, 2002
app pub date -
Apr 24, 2001
filing date -
Sep 7, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A signpost (11, 241-256, 322, 612, 623, 626-628, 652, 661, 682, 686, 703) transmits low frequency signals to a beacon tag (12, 271-275, 301-316, 395-397, 616-618, 641-643, 653, 656-657, 662-664, 679, 708, 711), which in turns transmits high frequency signals containing a signpost code from a received signpost signal to a reader (13, 261, 319, 521-530). The signpost can be mounted on one mobile device and the beacon tag on another mobile device, in order to determine when those mobile devices are in close proximity. Further, a sensor (32) can be provided to detect the presence of a mobile device, and to cause the signpost to change the signpost code in its transmitted signals.
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