Method and apparatus for supplying commands to a tag
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 20, 2004
Grant Date -
Aug 21, 2003
app pub date -
Apr 24, 2001
filing date -
Sep 7, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus (10, 240, 300) includes a signpost (11, 241-256, 322, 612, 623, 626-628, 652, 661, 682, 686, 703) which transmits signpost signals (24) to a tag (12, 271-275, 301-316, 395-397, 616-618, 641-643, 653, 656-657, 662-664, 679, 708, 711), which in turn transmits beacon signals (72) to a reader (13, 261, 319, 521-530). One of the signpost and tag is mounted on an item to be tracked. A control system (14, 500) is responsive to the reader, and can cause the signpost to vary the signpost signal in a manner which varies at least one operational characteristic of the tag, such as a transmission rate, a transmission power, a tag identification code, a password, or an encryption code, or which shifts the tag between a normal operational mode and a low power operational mode in which its transmitter is disabled.
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