US PATENT SUBCLASS 340 / 854.6
.~.~ Electromagnetic energy (e.g., radio frequency, 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.~.~ Electromagnetic energy (e.g., radio frequency, etc.) {2}
854.7  DF  .~.~.~> Optical link (e.g., waveguide, etc.)
854.8  DF  .~.~.~> Near field coupling (e.g., inductive, capacitive, etc.)


DEFINITION

Classification: 340/854.6

Electromagnetic energy (e.g., radio frequency, etc.):

(under subclass 853.1) Subject matter wherein the signal is transmitted in the form of a presence or variation in an electromagnetic field.

(1) Note. The term electromagnetic field is intended to include an electrical or magnetic field, as well as electromagnetic radiation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

870.01+, for a radio sonde telemetering system, of general utility.

SEE OR SEARCH CLASS

367, Communications, Electrical: Acoustic Wave Systems and

Devices,

81+, for an electrical wellbore telemetering system in which the signal is transmitted in the form of an acoustic wave.