US PATENT SUBCLASS 367 / 84
.~.~ Rotary valve control

Current as of: June, 1999
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367 /   HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES

81  DF  WELLBORE TELEMETERING {2}
83  DF  .~ Through well fluids {2}
84.~.~ Rotary valve control

DEFINITION

Classification: 367/84

Rotary valve control:

(under subclass 83) Subject matter wherein the acoustic waves are generated by rotational movement of structure which

modulates the well fluid flow.