US PATENT SUBCLASS 340 / 855.3-- .~ Multiplexed signals

US PATENT SUBCLASS 340 / 855.3
.~ Multiplexed signals

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}
855.3		.~ Multiplexed signals

DEFINITION

Classification: 340/855.3

Multiplexed signals:

(under subclass 853.1) Subject matter wherein signals from different sources or to different receivers are transmitted over a single channel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

870.12+, for frequency division multiplex telemetering equipment other than in a subsurface device.

870.13+, for time division multiplex telemetering equipment other than in a subsurface device.

SEE OR SEARCH CLASS

370, Multiplex Communications, appropriate subclasses for a multiplex communications device not limited to wellbore telemetering.