US PATENT SUBCLASS 324 / 338
.~.~.~ 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}
332  DF  .~ With radiant energy or nonconductive-type transmitter {2}
334  DF  .~.~ With separate pickup {4}
338.~.~.~ Within a borehole {1}
339  DF  .~.~.~.~> By induction logging {4}

DEFINITION

Classification: 324/338

Within a borehole:

(under subclass 334) 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.

346, for borehole investigation using magnetic means.

351+, 355 and 366+, for electrode arrangements used in a borehole.