US PATENT SUBCLASS 324 / 366
.~.~.~.~ For well 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}
347  DF  .~ Using electrode arrays, circuits, structure, or supports {2}
354  DF  .~.~ Coupled to artificial current source {2}
357  DF  .~.~.~ Including separate pickup of generated fields or potentials {6}
366.~.~.~.~ For well logging {7}
367  DF  .~.~.~.~.~> Using a pad member
368  DF  .~.~.~.~.~> Cased borehole
369  DF  .~.~.~.~.~> While drilling
370  DF  .~.~.~.~.~> Using surface current electrodes
371  DF  .~.~.~.~.~> Using plural fields
372  DF  .~.~.~.~.~> Between spaced boreholes
373  DF  .~.~.~.~.~> Using current focussing means {2}

DEFINITION

Classification: 324/366

For well logging:

(under subclass 357) 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.

355, for borehole electrodes coupled to an artificial current source. SEE OR SEARCH CLASS

73, Measuring and Testing,

152.02+, for formation logging, per se, in a borehole or a drilling test wherein the measurement or the analysis is not made by purely electrical means or purely magnetic means.