US PATENT SUBCLASS 324 / 364
.~.~.~.~.~ Using frequency variation

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}
347  DF  .~ Using electrode arrays, circuits, structure, or supports {2}
354  DF  .~.~ Coupled to artificial current source {2}
357  DF  .~.~.~ Including separate pickup of generated fields or potentials {6}
363  DF  .~.~.~.~ By varying the path of current flow {1}
364.~.~.~.~.~ Using frequency variation

DEFINITION

Classification: 324/364

Using frequency variation:

(under subclass 363) Subject matter in which the current flow paths are varied by changing the frequency of the current.