US PATENT SUBCLASS 324 / 355
.~.~.~ 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}
354  DF  .~.~ Coupled to artificial current source {2}
355.~.~.~ Within a borehole {1}
356  DF  .~.~.~.~> While drilling

DEFINITION

Classification: 324/355

Within a borehole:

(under subclass 354) Subject matter adapted for use within a drill hole in 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.

351+, for borehole electrode arrangements used in detecting naturally occurring fields and potentials.

366+, for borehole electrode arrangements with current emitting electrodes and separate potential pickup electrodes. SEE OR SEARCH CLASS

73, Measuring and Testing,

152.01+, for an apparatus or a process for borehole testing, per se, wherein the test is not made by purely electrical means or by purely magnetic measuring means.