US PATENT SUBCLASS 324 / 351
.~.~.~ Within a borehole

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}
347  DF  .~ Using electrode arrays, circuits, structure, or supports {2}
348  DF  .~.~ For detecting naturally occurring fields, currents, or potentials {2}
351.~.~.~ Within a borehole {2}
352  DF  .~.~.~.~> Combined with artificial source measurement
353  DF  .~.~.~.~> With fluid movement or pressure variation

DEFINITION

Classification: 324/351

Within a borehole:

(under subclass 348) Subject matter adapted for use within a hole which has been drilled or is being drilled within the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

333, for measuring parameters of a radiant energy means positioned in the borehole.

338+, for borehole investigation with separate pickup of radiated energy.

346, for borehole investigation using magnetic means.

355, for borehole electrodes coupled to an artificial current source.

366+, for separate pickup electrodes.