US PATENT SUBCLASS 340 / 854.7
.~.~.~ Optical link (e.g., waveguide, 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  DF  .~ Using a specific transmission medium (e.g., conductive fluid, annular spacing, etc.) {4}
854.6  DF  .~.~ Electromagnetic energy (e.g., radio frequency, etc.) {2}
854.7.~.~.~ Optical link (e.g., waveguide, etc.)

DEFINITION

Classification: 340/854.7

Optical link (e.g. waveguide, etc.):

(under subclass 854.6) Subject matter wherein the signal is transmitted over a communications link which includes an element which transmits electromagnetic energy having a frequency in or near the visible range.

(1) Note. The term near is to indicate that a system with an element which optically modifies IR or UV radiation is included in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

870.28+, for telemetering equipment having an optical link other than in a subsurface device.

SEE OR SEARCH CLASS

385, Optical Waveguides, appropriate subclasses for an optical energy conducting element.