US PATENT SUBCLASS 324 / 333
.~.~ 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}
333.~.~ Within a borehole

DEFINITION

Classification: 324/333

Within a borehole:

(under subclass 332) Subject matter in which the transmitter is adapted for use within a drill hole in the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

346, for borehole investigation using magnetic means.

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