US PATENT SUBCLASS 340 / 855.5
.~.~ Digital signal processing in subsurface transmitter

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  DF  .~ Pulse or digital signal transmission {1}
855.5.~.~ Digital signal processing in subsurface transmitter {1}
855.6  DF  .~.~.~> Having acoustic sensor

DEFINITION

Classification: 340/855.5

Digital signal processing in subsurface transmitter:

(under subclass 855.4) Subject matter wherein the subsurface signal processing includes a particularly described feature of digital signal handling.

(1) Note. Named or nominal inclusion of a digital device is not classified in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

870.19+, for pulse signal telemetering equipment other than in a subsurface device.

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion,

173+, for a digital or pulse code generator of general utility.

375, Pulse or Digital Communications, 295+, for a pulse transmitter of general utility.