Process for determining the resistivity of a formation...

Process for electromagnetic detection of conducting objects

Process for the production of a supply current of a solenoid for

Propagation anisotropic well logging system and method

Propagation based electromagnetic measurement of anisotropy...

Protective device for enlarging the effective diameter of a prob

Protective device permitting more specially the use of probe in

Pulse induction time domain metal detector

Pulse radar method and apparatus for detecting an object

Pulsed electromagnetic dipmeter method and apparatus employing c

Pulsed field system for detecting the presence of a target in a

Pulsed induction logging for determining conductivity and invade

Pulsed induction logging for determining invaded zone properties

Radial sounding electrical well logging instrument

Radio geophysical surveying method and apparatus

Radio mode selectivity block for a detector for detecting a...

Radio system for characterizing and outlining underground...

Re-configurable induction coil for metal detection

Receiver electronics proximate antenna

Receiver streamer system and method for marine...