US PATENT SUBCLASS 324 / 353
.~.~.~.~ With fluid movement or pressure 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}
348  DF  .~.~ For detecting naturally occurring fields, currents, or potentials {2}
351  DF  .~.~.~ Within a borehole {2}
353.~.~.~.~ With fluid movement or pressure variation

DEFINITION

Classification: 324/353

With fluid movement or pressure variation:

(under subclass 351) Subject matter including means for causing the movement of the fluid or variations in the pressure of the fluid existing within the borehole or the formations surrounding the borehole.