A wireless sensor system in which the sensor signal is hardly affected by disturbance and therefore has an increased reliability, which can be constructed light-weight and compact in structure inclusive of the electric power system and in which communication is possible at all times, and a wireless sensor...http://www.google.ca/patents/US7612665?utm_source=gb-gplus-sharePatent US7612665 - Wireless sensor system and bearing assembly having built-in wireless sensor
