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Class Information
Number: 340/855.4
Name: Communications: electrical > Wellbore telemetering or control (e.g., subsurface tool guidance, data transfer, etc.) > Pulse or digital signal transmission
Description: Subject matter wherein the information is transmitted in the form of an abrupt variation in an electrical signal or a pattern thereof.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7570920 |
AM-FM hybrid signal communicated to RFID tags |
Aug. 4, 2009 |
| 7541690 |
Signal transmission method, signal transmission device, and liquid crystal projector |
Jun. 2, 2009 |
| 7525264 |
Shunt regulation apparatus, systems, and methods |
Apr. 28, 2009 |
| 7490428 |
High performance communication system |
Feb. 17, 2009 |
| 7468679 |
Method and apparatus for mud pulse telemetry |
Dec. 23, 2008 |
| 7439875 |
Battery conservation |
Oct. 21, 2008 |
| 7423550 |
Two sensor impedance estimation for uplink telemetry signals |
Sep. 9, 2008 |
| 7397388 |
Borehold telemetry system |
Jul. 8, 2008 |
| 7345594 |
Noise attenuation apparatus for borehole telemetry |
Mar. 18, 2008 |
| 7327634 |
Rotary pulser for transmitting information to the surface from a drill string down hole in a well |
Feb. 5, 2008 |
| 7280432 |
Oscillating shear valve for mud pulse telemetry |
Oct. 9, 2007 |
| 7250873 |
Downlink pulser for mud pulse telemetry |
Jul. 31, 2007 |
| 7230880 |
Rotational pulsation system and method for communicating |
Jun. 12, 2007 |
| 7200070 |
Downhole drilling network using burst modulation techniques |
Apr. 3, 2007 |
| 7145472 |
Method and apparatus for high speed data dumping and communication for a down hole tool |
Dec. 5, 2006 |
| 7081831 |
Time-domain signal cancellation in downhole telemetry systems |
Jul. 25, 2006 |
| 7068183 |
Drill string incorporating an acoustic telemetry system employing one or more low frequency acoustic attenuators and an associated method of transmitting data |
Jun. 27, 2006 |
| 7057524 |
Pressure pulse generator for MWD |
Jun. 6, 2006 |
| 7026952 |
Downhole telemetry system using discrete multi-tone modulation having repeated symbols |
Apr. 11, 2006 |
| 6998998 |
High speed hazardous area communication with safety barriers |
Feb. 14, 2006 |
| 6977867 |
Seismic data acquisition system |
Dec. 20, 2005 |
| 6975244 |
Oscillating shear valve for mud pulse telemetry and associated methods of use |
Dec. 13, 2005 |
| 6940420 |
Drill string telemetry system |
Sep. 6, 2005 |
| 6850463 |
Borehole logging apparatus for deep well drilling |
Feb. 1, 2005 |
| 6823219 |
Universal optical control and management platform |
Nov. 23, 2004 |
| 6819260 |
Synchronous CDMA telemetry system for use in a wellbore |
Nov. 16, 2004 |
| 6750783 |
Low frequency electromagnetic telemetry system employing high cardinality phase shift keying |
Jun. 15, 2004 |
| 6714138 |
Method and apparatus for transmitting information to the surface from a drill string down hole in a well |
Mar. 30, 2004 |
| 6657551 |
Downhole telemetry system having discrete multi-tone modulation and dynamic bandwidth allocation |
Dec. 2, 2003 |
| 6646546 |
Multiple-port gigabit ethernet distribution switch |
Nov. 11, 2003 |
| 6636159 |
Borehole logging apparatus for deep well drillings with a device for transmitting borehole measurement data |
Oct. 21, 2003 |
| 6608565 |
Downward communication in a borehole through drill string rotary modulation |
Aug. 19, 2003 |
| 6583729 |
High data rate acoustic telemetry system using multipulse block signaling with a minimum distance receiver |
Jun. 24, 2003 |
| 6434084 |
Adaptive acoustic channel equalizer & tuning method |
Aug. 13, 2002 |
| 6421298 |
Mud pulse telemetry |
Jul. 16, 2002 |
| 6396415 |
Method and system of communicating in a subterranean well |
May. 28, 2002 |
| 6320820 |
High data rate acoustic telemetry system |
Nov. 20, 2001 |
| 6288632 |
Apparatus and method for power line communication (PLC) |
Sep. 11, 2001 |
| 6252518 |
Communications systems in a well |
Jun. 26, 2001 |
| 5995020 |
Downhole power and communication system |
Nov. 30, 1999 |
| 5856790 |
Remote control for a plug-dropping head |
Jan. 5, 1999 |
| 5841666 |
Processor apparatus and method for a process measurement signal |
Nov. 24, 1998 |
| 5670931 |
Method and apparatus for transmitting data over a power cable utilizing a magnetically saturable core reactor |
Sep. 23, 1997 |
| 5661754 |
Receiver arrangement |
Aug. 26, 1997 |
| 5572182 |
Integrated power and signal transmission system |
Nov. 5, 1996 |
| 5515038 |
Data transmission system |
May. 7, 1996 |
| 5473321 |
Method and apparatus to train telemetry system for optimal communications with downhole equipment |
Dec. 5, 1995 |
| 5465270 |
Process and device for the digitized transmission of signals |
Nov. 7, 1995 |
| 5448227 |
Method of and apparatus for making near-bit measurements while drilling |
Sep. 5, 1995 |
| 5387907 |
High data rate wireline telemetry system |
Feb. 7, 1995 |
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