US PATENT SUBCLASS 33 / 306
.~.~ Fluid (e.g., drilling fluid, etc.) responsive

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
304  DF  .~ Borehole direction or inclination {6}
306.~.~ Fluid (e.g., drilling fluid, etc.) responsive {1}
307  DF  .~.~.~> Varied pressure or pressure pulses representative

DEFINITION

Classification: 33/306

(under subclass 304) Device wherein the borehole direction or inclination indicator reacts to or is controlled by the presence or motion of a fluid within the borehole.