US PATENT SUBCLASS 340 / 855.4
.~ Pulse or digital signal transmission

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}
855.4.~ Pulse or digital signal transmission {1}
855.5  DF  .~.~> Digital signal processing in subsurface transmitter {1}

DEFINITION

Classification: 340/855.4

Pulse or digital signal transmission:

(under subclass 853.1) Subject matter wherein the information is transmitted in the form of an abrupt variation in an electrical signal or a pattern thereof.