US PATENT SUBCLASS 340 / 854.3
.~ Using a specific transmission medium (e.g., conductive fluid, annular spacing, etc.)

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.~ Using a specific transmission medium (e.g., conductive fluid, annular spacing, etc.) {4}
854.4  DF  .~.~> Drill string or tubing support signal conduction
854.5  DF  .~.~> Wellbore casing or ground
854.6  DF  .~.~> Electromagnetic energy (e.g., radio frequency, etc.) {2}
854.9  DF  .~.~> Cable or wire (e.g., conductor as support, etc.) {2}

DEFINITION

Classification: 340/854.3

Using a specific transmission medium (e.g., conductive fluid, annular spacing, etc.):

(under subclass 853.1) Subject matter including a particularly described feature of the structure or

composition of a material or medium through which the information or control signals are transmitted.

(1) Note. The material is usually an electrical conductor.

(2) Note. Named or nominal inclusion of a conductor is not considered particularly described as required for classification in this or its indented subclasses.

SEE OR SEARCH CLASS

174, Electricity: Conductors and Insulators,

37+, for an underground conductor.