US PATENT SUBCLASS 340 / 854.8
.~.~.~ Near field coupling (e.g., inductive, capacitive, 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}
854.8.~.~.~ Near field coupling (e.g., inductive, capacitive, etc.)

DEFINITION

Classification: 340/854.8

Near field coupling (e.g., inductive, capacitive, etc.):

(under subclass 854.6) Subject matter wherein the electromagnetic energy has a variation other than the inverse square of distance.

(1) Note. The term near field is intended to include nonradiative coupling such as by an inductive or capacitive field.

SEE OR SEARCH CLASS

379, Telephonic Communications,

55.1, for a near field telephone device.

381, Electrical Audio Signal Processing Systems and Devices,

79, for a for a near field audio system.

455, Telecommunications, 41, for a modulated near field communication system.