07742745 is referenced by 28 patents and cites 129 patents.

A wireless transceiver includes: (a) a low power radio frequency (LPRF) communications component capable of powering down to conserve energy and capable of powering up in response to an electronic signal, the LPRF communications component including a transmitter and a first receiver; and (b) a second receiver that is configured to screen a radio frequency broadcast and provide, on the basis of specific data identified therein, the electronic signal to the LPRF communications component in order to power up the LPRF communications component. The second receiver is adapted to draw less current than the LPRF communications component while awaiting receipt of and listening for a radio frequency broadcast.

Title
LPRF device wake up using wireless tag
Application Number
12/475395
Publication Number
7742745 (B2)
Application Date
May 29, 2009
Publication Date
June 22, 2010
Inventor
Robert W Twitchell Jr
Cumming
GA, US
Agent
Jeremy C Doerre
Chad D Tillman
Tillman Wright PLLC
Assignee
Terahop Networks
GA, US
IPC
H04B 7/00
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