78058338
Apr 13, 2001
Jan 28, 2003
electronic down hole drill string and well casing components used in oil, gas, or geothermal well exploration and production, namely a sub assembly comprising inductive couplers, power source, transducers, and electronic components for gathering, storing, and transceiving data; for amplifying and restoring a carrier signal, and for reporting down hole conditions via a down hole network
Electrical and Scientific Apparatus