US PATENT SUBCLASS 340 / 855.6
.~.~.~ Having acoustic sensor

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  DF  .~.~ Digital signal processing in subsurface transmitter {1}
855.6.~.~.~ Having acoustic sensor

DEFINITION

Classification: 340/855.6

Having acoustic sensor:

(under subclass 855.5) Subject matter having a subsurface vibratory transducer connected to the digital signal processing apparatus or the electrical communications link.

SEE OR SEARCH THIS CLASS, SUBCLASS:

856.4, for this subject matter absent subsurface digital circuitry.