US PATENT SUBCLASS 324 / 339
.~.~.~.~ By induction logging

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

323  DF  OF GEOPHYSICAL SURFACE OR SUBSURFACE IN SITU {7}
332  DF  .~ With radiant energy or nonconductive-type transmitter {2}
334  DF  .~.~ With separate pickup {4}
338  DF  .~.~.~ Within a borehole {1}
339.~.~.~.~ By induction logging {4}
340  DF  .~.~.~.~.~> To measure susceptibility
341  DF  .~.~.~.~.~> To measure dielectric constant
342  DF  .~.~.~.~.~> Using a toroidal coil
343  DF  .~.~.~.~.~> Using angularly spaced coils

DEFINITION

Classification: 324/339

By induction logging:

(under subclass 338) Subject matter in which eddy currents are induced in the formations surrounding the borehole by an alternating electromagnetic field from a transmitter coil and a secondary electromagnetic field set up by the eddy currents induces an electromotive force in the pickup or receiver coil.

SEE OR SEARCH THIS CLASS, SUBCLASS:

239+, for induced voltage-type sensors in magnetic testing.