US PATENT SUBCLASS 340 / 853.4
.~.~ In horizontal or inclined drilling or passage

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}
853.3  DF  .~ Selective control of subsurface equipment {2}
853.4.~.~ In horizontal or inclined drilling or passage {1}
853.5  DF  .~.~.~> Control of drilling apparatus using magnetic field

DEFINITION

Classification: 340/853.4

In horizontal or inclined drilling or passage:

(under subclass 853.3) Subject matter wherein the opening in the earth is in other than a substantially vertical direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

856.1, for this subject matter absent selective control of subsurface equipment.