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...http://www.google.fr/patents/US20100067420?utm_source=gb-gplus-shareBrevet US20100067420 - LPRF DEVICE WAKE UP USING WIRELESS TAG
