US PATENT SUBCLASS 33 / 307
.~.~.~ Varied pressure or pressure pulses representative

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  DF  .~.~ Fluid (e.g., drilling fluid, etc.) responsive {1}
307.~.~.~ Varied pressure or pressure pulses representative

DEFINITION

Classification: 33/307

(under subclass 306) Device wherein the inclination of the borehole is interpreted from pressure changes in the drilling fluid at the borehole outlet or from generated pressure surges in the drilling fluid.

SEE OR SEARCH CLASS

73, Measuring and Testing,

37+, for measuring and testing means utilizing fluid pressure.

367, Communications, Electrical: Acoustic Wave Systems and

Devices,

81+, for wellbore acoustic wave telemetering, per se.