Magnetic head for conductivity imaging for use in boreholes

Magnetic sensing assembly for measuring time varying...

Magnetic susceptibility well-logging unit with single power supp

Measurement of in-phase and out-of-phase components of low frequ

Measurement of subterranean lithology using electromagnetic...

Measurement tool for obtaining tool face on a rotating drill...

Measurements of electrical properties through non...

Method and apparatus employing phase cycling for reducing...

Method and apparatus for a multi-component induction...

Method and apparatus for a multi-component induction...

Method and apparatus for a quadrupole transmitter for...

Method and apparatus for a quadrupole transmitter for...

Method and apparatus for accurately measuring properties of...

Method and apparatus for avoiding mutual coupling between receiv

Method and apparatus for azimuthal electromagnetic well...

Method and apparatus for balancing the electrical output of the

Method and apparatus for broadband measurement of dielectric pro

Method and apparatus for calibrating the output measurement of a

Method and apparatus for cancellation of borehole effects...

Method and apparatus for cancellation of borehole effects...