US PATENT SUBCLASS 340 / 855.9
.~.~ Specified alternating current (A.C.) circuit feature

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}
855.8  DF  .~ Including specified power transmission feature or source (e.g., battery, etc.) {1}
855.9.~.~ Specified alternating current (A.C.) circuit feature

DEFINITION

Classification: 340/855.9

Specified alternating current (A.C.) circuit feature:

(under subclass 855.8) Subject matter wherein the feature providing for the energization of the subsurface station is described as having a feature varying as the frequency of an alternating current.