US PATENT SUBCLASS 324 / 373
.~.~.~.~.~ Using current focussing means

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}
373.~.~.~.~.~ Using current focussing means {2}
374  DF  .~.~.~.~.~.~> Including a pad member
375  DF  .~.~.~.~.~.~> Including plural current focussing arrays

DEFINITION

Classification: 324/373

Using current focussing means:

(under subclass 366) Subject matter in which main survey current and auxiliary guard current electrodes are provided so as to confine or "focus" the survey current to a thin horizontal path into the formations.