US PATENT SUBCLASS 324 / 334
.~.~ With separate pickup

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.~.~ With separate pickup {4}
335  DF  .~.~.~> Employing multiple frequencies
336  DF  .~.~.~> To detect transient signals
337  DF  .~.~.~> To detect return wave signals
338  DF  .~.~.~> Within a borehole {1}

DEFINITION

Classification: 324/334

With separate pickup:

(under subclass 332) Subject matter having means distinct from the radiating means, for detecting the energy which has

been radiated.

(1) Note. The earth, for example, may act as a mutual inductance to convey a variable amount of energy from a transmitter coil to a receiver coil, in dependence upon the electrical characteristics of the formation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

329, for the detection of small objects using transmitter-receiver means.

330, for transmitter-receiver systems used in aerial surveys.

SEE OR SEARCH CLASS

455, Telecommunications, 39+, for particular transmitter-receiver systems used in communication.