US PATENT SUBCLASS 324 / 375
.~.~.~.~.~.~ Including plural current focussing arrays

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  DF  .~.~.~.~.~ Using current focussing means {2}
375.~.~.~.~.~.~ Including plural current focussing arrays

DEFINITION

Classification: 324/375

Including plural current focussing arrays:

(under subclass 373) Subject matter having more than one focussing electrode configuration on a single borehole tool.

(1) Note. The plural configurations may include different focussing electrode systems such as an elongated array combined with a pad member array, a single type system with means for switching between electrodes to form the plural configurations, or separate arrays of the same type vertically spaced along the borehole. This subclass does not include a plurality of similar pad member arrays horizontally spaced around the borehole.