US PATENT SUBCLASS 340 / 855.7
.~ Modification of signal bandwidth, frequency, or circuit impedance at subsurface location


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}
855.7.~ Modification of signal bandwidth, frequency, or circuit impedance at subsurface location


DEFINITION

Classification: 340/855.7

Modification of signal bandwidth, frequency, or circuit impedance at subsurface location:

(under subclass 853.1) Subject matter wherein the information to be transmitted is modulated on a signal and either the signal or circuit frequency characteristics are subsequently modified to optimize transmission between the surface and subsurface communications equipment.

SEE OR SEARCH THIS CLASS, SUBCLASS:

853.7, for a signal-modifying repeater in a wellbore cable or other subsurface link.