| Patent | Date |
|---|
Enhanced waveform analysis for target modes of borehole waves
Grant 11,435,493 - Wang , et al. September 6, 2 | 2022-09-06 |
Downhole Ultrasound Image Correction in Oil Based Mud
App 20220276403 - Weng; Yu ; et al. | 2022-09-01 |
Method And Apparatus For Geophysical Formation Evaluation Measurements Behind Casing
App 20220268959 - WALKER; Kristoffer Thomas ; et al. | 2022-08-25 |
Downhole ultrasound image correction in oil based mud
Grant 11,415,720 - Weng , et al. August 16, 2 | 2022-08-16 |
Borehole dispersive wave processing with automatic dispersion matching for compressional and shear slowness
Grant 11,385,374 - Wang , et al. July 12, 2 | 2022-07-12 |
Robust Logging-while-drilling Sonic Transmitters With Improved Strength And Bandwidth
App 20220162938 - Chang; Chung ; et al. | 2022-05-26 |
Logging While Drilling Tool
App 20220106873 - Sun; Qingtao ; et al. | 2022-04-07 |
Acoustic receivers with cylindrical crystals
Grant 11,293,904 - Nguyen , et al. April 5, 2 | 2022-04-05 |
Hydrophone having no internal leads
Grant 11,280,926 - Chang , et al. March 22, 2 | 2022-03-22 |
Borehole imaging using amplitudes of refracted acoustic waves
Grant 11,243,326 - Ge , et al. February 8, 2 | 2022-02-08 |
High precision acoustic logging processing for compressional and shear slowness
Grant 11,209,565 - Wang , et al. December 28, 2 | 2021-12-28 |
Quadruple transmitter and methods to determine wave velocities of a downhole formation
Grant 11,143,777 - Jin , et al. October 12, 2 | 2021-10-12 |
Enhanced-resolution Rock Formation Body Wave Slowness Determination From Borehole Guided Waves
App 20210286099 - WANG; Ruijia ; et al. | 2021-09-16 |
Automatic slowness-frequency range determination for advanced borehole sonic data processing
Grant 11,112,519 - Wang , et al. September 7, 2 | 2021-09-07 |
Enhanced Waveform Analysis For Target Modes Of Borehole Waves
App 20210208299 - WANG; Ruijia ; et al. | 2021-07-08 |
Sonic Through Tubing Cement Evaluation
App 20210123731 - Chang; Chung ; et al. | 2021-04-29 |
Echo velocity measurements without using recessed ultrasonic transceiver
Grant 10,947,838 - Chang , et al. March 16, 2 | 2021-03-16 |
Acoustic Sensor Self-induced Interference Control
App 20210074904 - Chang; Chung ; et al. | 2021-03-11 |
Downhole Acoustic Measurement
App 20210048548 - Chang; Chung ; et al. | 2021-02-18 |
Quadruple Transmitter And Methods To Determine Wave Velocities Of A Downhole Formation
App 20210003732 - JIN; Jing ; et al. | 2021-01-07 |
Identifying and visually presenting formation slowness based on low-frequency dispersion asymptotes
Grant 10,775,525 - Wang , et al. Sept | 2020-09-15 |
Acoustic Receivers with Cylindrical Crystals
App 20200278326 - Nguyen; Minh Dang ; et al. | 2020-09-03 |
Quasi-static Stoneley slowness estimation
Grant 10,670,761 - Wang , et al. | 2020-06-02 |
Acoustic receivers with cylindrical crystals
Grant 10,663,435 - Nguyen , et al. | 2020-05-26 |
Real-time determination of mud slowness, formation type, and monopole slowness picks in downhole applications
Grant 10,663,612 - Wang , et al. | 2020-05-26 |
Downhole Tool Dynamic And Motion Measurement With Multiple Ultrasound Transducer
App 20200116005 - Li; Peng ; et al. | 2020-04-16 |
Downhole Ultrasound Image Correction in Oil Based Mud
App 20200116884 - Weng; Yu ; et al. | 2020-04-16 |
Mud Speed Measurements Without Using Recessed Ultrasonic Transceiver
App 20200116012 - Chang; Chung ; et al. | 2020-04-16 |
Downhole acoustic source localization
Grant 10,598,563 - Lu , et al. | 2020-03-24 |
Apparatus and techniques for acoustic logging tool modeling
Grant 10,488,538 - Li , et al. Nov | 2019-11-26 |
Ultrasonic transducer with improved backing element
Grant 10,481,288 - Chang , et al. Nov | 2019-11-19 |
Acoustic logging tool utilizing fundamental resonance
Grant 10,473,808 - Chang , et al. Nov | 2019-11-12 |
Quasi-static Stoneley Slowness Estimation
App 20190317238 - Wang; Ruijia ; et al. | 2019-10-17 |
Hydrophone Having No Internal Leads
App 20190302303 - Chang; Chung ; et al. | 2019-10-03 |
Acoustic Logging Data Processing Using Waveform Amplitude And Phase
App 20190293823 - SUN; BAICHUN ; et al. | 2019-09-26 |
Acoustic logging tool utilizing fundamental resonance
Grant 10,393,903 - Jin , et al. A | 2019-08-27 |
Real-Time Determination of Mud Slowness, Formation Type, and Monopole Slowness Picks in Downhole Applications
App 20190257971 - WANG; Ruijia ; et al. | 2019-08-22 |
Borehole Imaging Using Amplitudes of Refracted Acoustic Waves
App 20190204468 - GE; Yao ; et al. | 2019-07-04 |
Hydrophone having no internal leads
Grant 10,330,810 - Chang , et al. | 2019-06-25 |
Method of minimizing tool response for downhole logging operations
Grant 10,317,555 - Li , et al. | 2019-06-11 |
Bender bar transducer with at least three resonance modes
Grant 10,293,376 - Jin , et al. | 2019-05-21 |
Wide bandwidth borehole dipole source for acoustic logging
Grant 10,288,758 - Chang , et al. | 2019-05-14 |
Acoustic Imaging For Wellbore Investigation
App 20190101663 - Walters; Darren P. ; et al. | 2019-04-04 |
Borehole Dispersive Wave Processing With Automatic Dispersion Matching For Compressional And Shear Slowness
App 20190025452 - WANG; Ruijia ; et al. | 2019-01-24 |
Identifying And Visually Presenting Formation Slowness Based On Low-frequency Dispersion Asymptotes
App 20190025451 - WANG; Ruijia ; et al. | 2019-01-24 |
High Precision Acoustic Logging Processing For Compressional And Shear Slowness
App 20190018162 - WANG; Ruijia ; et al. | 2019-01-17 |
High Precision Acoustic Logging Processing For Compressional And Shear Slowness
App 20190018161 - WANG; Ruijia ; et al. | 2019-01-17 |
Acoustic Receivers with Cylindrical Crystals
App 20190011404 - Nguyen; Minh Dang ; et al. | 2019-01-10 |
Acoustic dipole piston transmitter
Grant 10,082,020 - Wisniewski , et al. September 25, 2 | 2018-09-25 |
Downhole Acoustic Source Localization
App 20180217021 - Lu; Yinghui ; et al. | 2018-08-02 |
Structural element for sonic tools and acoustic isolators
Grant 10,024,992 - Chang , et al. July 17, 2 | 2018-07-17 |
High-performance dipole acoustic transmitter
Grant 9,952,344 - Chang , et al. April 24, 2 | 2018-04-24 |
Wide bandwidth drill pipe structure for acoustic telemetry
Grant 9,926,781 - Xia , et al. March 27, 2 | 2018-03-27 |
Acoustic isolator for downhole tools
Grant 9,891,336 - Chang , et al. February 13, 2 | 2018-02-13 |
Downhole tool vibration device and method
Grant 9,869,141 - Chang January 16, 2 | 2018-01-16 |
Method of Minimizing Tool Response for Downhole Logging Operations
App 20170371058 - Li; Wei ; et al. | 2017-12-28 |
Ultrasonic Transducer With Improved Backing Element
App 20170299751 - Chang; Chung ; et al. | 2017-10-19 |
Acoustic Logging Tool Utilizing Fundamental Resonance
App 20170285205 - Jin; Jing ; et al. | 2017-10-05 |
Acoustic Logging Tool Utilizing Fundamental Resonance
App 20170276819 - Chang; Chung ; et al. | 2017-09-28 |
Asymmetric bender bar transducer
Grant 9,757,770 - Chang , et al. September 12, 2 | 2017-09-12 |
Hydrophone Having no Internal Leads
App 20170248724 - Chang; Chung ; et al. | 2017-08-31 |
Borehole Acoustic Logging Receiver Quality Control and Calibration
App 20170212274 - Sun; Baichun ; et al. | 2017-07-27 |
A High-Performance Dipole Acoustic Transmitter
App 20170168186 - Chang; Chung ; et al. | 2017-06-15 |
Variable stiffness downhole tool housing
Grant 9,631,476 - Chang , et al. April 25, 2 | 2017-04-25 |
Wide Bandwidth Drill Pipe Structure For Acoustic Telemetry
App 20160341032 - Xia; Hua ; et al. | 2016-11-24 |
Acoustic Dipole Piston Transmitter
App 20160326868 - WISNIEWSKI; Laurence T. ; et al. | 2016-11-10 |
Apparatus And Techniques For Acoustic Logging Tool Modeling
App 20160252637 - Li; Chen ; et al. | 2016-09-01 |
Structural Element For Sonic Tools And Acoustic Isolators
App 20160252639 - Chang; Chung ; et al. | 2016-09-01 |
Asymmetric Bender Bar Transducer
App 20160114354 - Chang; Chung ; et al. | 2016-04-28 |
Acoustic receiver assembly for downhole tools
Grant 9,322,947 - Chang , et al. April 26, 2 | 2016-04-26 |
Rotational driveshaft coupler to facilitate a seal with static contacts
Grant 9,309,927 - Chang April 12, 2 | 2016-04-12 |
Acoustic Isolator For Downhole Tools
App 20160003960 - Chang; Chung ; et al. | 2016-01-07 |
Acoustic imaging
Grant 9,110,166 - Chang , et al. August 18, 2 | 2015-08-18 |
Axis Maintenance Apparatus, Systems, And Methods
App 20150167402 - Chang; Chung | 2015-06-18 |
Wide Bandwidth Borehole Dipole Source
App 20150143888 - Chang; Chung ; et al. | 2015-05-28 |
Acoustic Receiver Assembly For Downhole Tools
App 20150136516 - Chang; Chung ; et al. | 2015-05-21 |
Variable Stiffness Downhole Tool Housing
App 20150101800 - Chang; Chung ; et al. | 2015-04-16 |
Neural Network Signal Processing of Microseismic Events
App 20140334260 - Chang; Chung ; et al. | 2014-11-13 |
Cased borehole tool orientation measurement
Grant 8,794,317 - Chang , et al. August 5, 2 | 2014-08-05 |
System And Method For Determining Shear Wave Anisotropy In A Vertically Transversely Isotropic Formation
App 20140160890 - Fang; Xinding ; et al. | 2014-06-12 |
System And Method For Borehole Communication
App 20130146279 - CHANG; CHUNG ; et al. | 2013-06-13 |
Acoustic Imaging
App 20130142009 - Chang; Chung ; et al. | 2013-06-06 |
Rotational Driveshaft Coupler To Facilitate A Perfect Seal
App 20130068049 - Chang; Chung | 2013-03-21 |
Cased Borehole Tool Orientation Measurement
App 20120145384 - CHANG; CHUNG ; et al. | 2012-06-14 |
Cased borehole tool orientation measurement
Grant 8,141,635 - Chang , et al. March 27, 2 | 2012-03-27 |
Two way check shot and reverse VSP while drilling
Grant 8,009,510 - Chang August 30, 2 | 2011-08-30 |
Apparatus and method for steam disinfection of liquid dispensing machine
Grant 7,895,938 - Chang , et al. March 1, 2 | 2011-03-01 |
Two Way Check Shot And Reverse Vsp While Drilling
App 20100101861 - Chang; Chung | 2010-04-29 |
Cased Borehole Tool Orientation Measurement
App 20100089572 - Chang; Chung ; et al. | 2010-04-15 |
Vinyl addition polycyclic olefin polymers prepared with non-olefinic chain transfer agents and uses thereof
Grant 7,674,847 - Rhodes , et al. March 9, 2 | 2010-03-09 |
Downhole seismic source
Grant 7,617,908 - Chang , et al. November 17, 2 | 2009-11-17 |
Downhole acoustic source
Grant 7,578,359 - Coates , et al. August 25, 2 | 2009-08-25 |
Downhole Acoustic Source
App 20080149416 - Coates; Richard ; et al. | 2008-06-26 |
Downhole Seismic Source
App 20080110691 - Chang; Chung ; et al. | 2008-05-15 |
Acoustic logging tool sleeve
Grant 7,334,661 - Pabon , et al. February 26, 2 | 2008-02-26 |
Data logging
Grant 7,302,346 - Chang , et al. November 27, 2 | 2007-11-27 |
Data logging
App 20070143022 - Chang; Chung ; et al. | 2007-06-21 |
Apparatus and Method for Steam Disinfection of Liquid Dispensing Machine
App 20070084351 - Chang; Chung ; et al. | 2007-04-19 |
Acoustic logging tool sleeve
App 20050173185 - Pabon, Jahir ; et al. | 2005-08-11 |
Import/export and repartitioning of partitioned objects
Grant 6,820,095 - Yeung , et al. November 16, 2 | 2004-11-16 |
Acoustic source using a shaftless electrical hammer
Grant 6,782,970 - Chang August 31, 2 | 2004-08-31 |
Acoustic transducer with spiral-shaped piezoelectric shell
Grant 6,671,380 - Chang , et al. December 30, 2 | 2003-12-30 |
Acoustic source using a shaftless electrical hammer
App 20030205428 - Chang, Chung | 2003-11-06 |
Decoder for error correcting block codes
Grant 6,637,002 - Weng , et al. October 21, 2 | 2003-10-21 |
Acoustic Transducer with spiral-shaped piezoelectric shell
App 20020118849 - Chang, Chung ; et al. | 2002-08-29 |
Import/export and repartitioning of partitioned objects
Grant 6,240,428 - Yeung , et al. May 29, 2 | 2001-05-29 |
Overerase correction for flash memory which limits overerase and prevents erase verify errors
Grant 5,642,311 - Cleveland , et al. June 24, 1 | 1997-06-24 |
Geophysical prospecting method using pseudo-random pulse sequences
Grant 5,226,018 - Chang , et al. July 6, 1 | 1993-07-06 |
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