US PATENT SUBCLASS 367 / 82
.~ Through drill string or casing

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

81  DF  WELLBORE TELEMETERING {2}
82.~ Through drill string or casing

DEFINITION

Classification: 367/82

Through drill string or casing:

(under subclass 81) Subject matter wherein the medium is, or is contained in, means connecting a drill bit in the passageway to driving apparatus on the earth's surface.