Patent ID: 7005986

Claim:
A remote temperature monitoring apparatus, comprising: a base-located energizing wave transmission/communication wave reception unit located at a base location, that transmits an energizing wave and that receives temperature-dependent communication wave emissions, and a remotely-located, energizing-wave-powered, temperature-dependent communication wave emission unit, located at a remote location from the base location, for monitoring temperature at the remote location and for transmitting a temperature-dependent communication wave emission, wherein said remotely-located, energizing-wave-powered, temperature-dependent communication wave emission unit includes a crystal material having a temperature-dependent communication wave emission characteristic, and wherein said crystal material is directly connected to an antenna, wherein said material having a temperature-dependent communication wave emission characteristic is powered by said energizing wave from said base-located energizing wave transmission/communication wave reception unit, and wherein said temperature-dependent communication wave emission is received by said base-located energizing wave transmission/communication wave reception unit which provides an alarm signal when the monitored temperature at the remote location is equal to or is beyond a predetermined alarm temperature.