US PATENT SUBCLASS 324 / 371
.~.~.~.~.~ Using plural fields

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}
366  DF  .~.~.~.~ For well logging {7}
371.~.~.~.~.~ Using plural fields

DEFINITION

Classification: 324/371

Using plural fields:

(under subclass 366) Subject matter having means for creating more than one field in the formations surrounding the borehole and pickup electrode means responsive to each of the fields.

(1) Note. The fields may be created simultaneously or at different times and may have the same or different frequencies.