US PATENT SUBCLASS 367 / 83
.~ Through well fluids

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

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

DEFINITION

Classification: 367/83

Through well fluids:

(under subclass 81) Subject matter wherein the medium is a liquid.