US PATENT SUBCLASS 324 / 346
.~.~ 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}
345  DF  .~ By magnetic means {1}
346.~.~ Within a borehole

DEFINITION

Classification: 324/346

Within a borehole:

(under subclass 345) Subject matter adapted for use within a drill hole in the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

303, for magnetic resonance measuring using well logging systems.

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

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

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