US PATENT SUBCLASS 324 / 335
.~.~.~ Employing multiple frequencies

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}
335.~.~.~ Employing multiple frequencies

DEFINITION

Classification: 324/335

Employing multiple frequencies:

(under subclass 334) Subject matter in which more than one frequency is employed for investigating the subsurface formation between the transmitter and pickup.

(1) Note. The plurality of frequencies may be produced by varying the frequency of the signal from a single source, or, by provision of a plurality of different frequency sources.