US PATENT SUBCLASS 340 / 853.3
.~ Selective control of subsurface equipment

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.~ Selective control of subsurface equipment {2}
853.4  DF  .~.~> In horizontal or inclined drilling or passage {1}
853.6  DF  .~.~> Control of drill bit or apparatus (e.g., steering, speed, etc.)

DEFINITION

Classification: 340/853.3

Selective control of subsurface equipment:

(under subclass 853.1) Subject matter having a communication link for controlling one or more devices in the underground equipment to obtain a plurality of results by transmission of a designated one of plural distinctive control signals over a smaller number of communication lines or channels than the

total number of possible distinct results and which controls the underground equipment in accordance with the signal content.

(1) Note. For further elaboration of selective communications, see the definition and notes of subclass 825 in this class.

(2) Note. Recitation of a detail of diverse art underground equipment is classified with such equipment.

(3) Note. Included in this and its indented subclasses are systems not limited to wellbore telemetering.

SEE OR SEARCH THIS CLASS, SUBCLASS:

825+, for selective control of remote equipment, other than a subsurface device.

SEE OR SEARCH CLASS 175, Boring or Penetrating the Earth,

24+, automatic control of drilling by other than an electrical communications system. Automatic control of drilling by other than an electrical communications system.

439, Electrical Connectors, appropriate subclasses for electrical connector structure, of general utility.