US PATENT SUBCLASS 340 / 854.5
.~.~ Wellbore casing or ground

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

853.1  DF  WELLBORE TELEMETERING OR CONTROL (E.G., SUBSURFACE TOOL GUIDANCE, DATA TRANSFER, ETC.) {14}
854.3  DF  .~ Using a specific transmission medium (e.g., conductive fluid, annular spacing, etc.) {4}
854.5.~.~ Wellbore casing or ground

DEFINITION

Classification: 340/854.5

Wellbore casing or ground:

(under subclass 854.3) Subject matter including conduction or passage of the signal through a well casing or the surrounding earth.