Issued Patents All Time
Showing 1–25 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10408050 | Acoustic receiver for use on a drill string | Douglas S. Drumheller | 2019-09-10 |
| 9458712 | Acoustic telemetry stacked-ring wave delay isolator system and method | David D. Whalen, Douglas S. Drumheller | 2016-10-04 |
| 8982667 | Acoustic telemetry stacked-ring wave delay isolator system and method | David D. Whalen, Douglas S. Drumheller | 2015-03-17 |
| 8922387 | Tapered thread EM gap sub self-aligning means and method | David D. Whalen | 2014-12-30 |
| 8823543 | Telemetry wave detection apparatus and method | James M. Neff, Douglas S. Drumheller | 2014-09-02 |
| 8634274 | Spindle for mud pulse telemetry applications | David A. Switzer, Anthony R. Dopf, Laura C. Neels-Slingerland | 2014-01-21 |
| 8624464 | Brush and brush housing arrangement to mitigate hydrodynamic brush lift in fluid-immersed electric motors | Anthony R. Dopf, Derek W. Logan, Timothy Neff | 2014-01-07 |
| 8437220 | Parallel-path acoustic telemetry isolation system and method | David D. Whalen, Douglas S. Drumheller | 2013-05-07 |
| 8393412 | System and method for accurate wellbore placement | John Godfrey McRory, David D. Whalen, James M. Neff | 2013-03-12 |
| 8308199 | Electrical isolation connector for electromagnetic gap sub | Derek W. Logan, David D. Whalen, Thomas H. Vermeeren, Anthony R. Dopf | 2012-11-13 |
| 8270251 | Acoustic isolator | Douglas S. Drumheller, Anthony R. Dopf, Derek W. Logan | 2012-09-18 |
| 8174929 | Spindle for mud pulse telemetry applications | David A. Switzer, Anthony R. Dopf, Laura C. Neels-Slingerland | 2012-05-08 |
| 8115651 | Drill string telemetry methods and apparatus | James M. Neff, Derek W. Logan | 2012-02-14 |
| 8022840 | Telemetry transmitter optimization using time domain reflectometry | James M. Neff | 2011-09-20 |
| 7928861 | Telemetry wave detection apparatus and method | James M. Neff, Douglas S. Drumheller | 2011-04-19 |
| 7900968 | Electrical isolation connector for electromagnetic gap sub | Derek W. Logan, David D. Whalen, Thomas H. Vermeeren, Anthony R. Dopf | 2011-03-08 |
| 7872945 | Dynamic efficiency optimization of piezoelectric actuator | Edwin I. Hildebrandt, Andrzej M. Sendyk | 2011-01-18 |
| 7821178 | Brush and brush housing arrangement to mitigate hydrodynamic brush lift in fluid-immersed electric motors | Anthony R. Dopf, Derek W. Logan, Timothy Neff | 2010-10-26 |
| 7817061 | Telemetry transmitter optimization using time domain reflectometry | James M. Neff | 2010-10-19 |
| 7768423 | Telemetry transmitter optimization via inferred measured depth | James M. Neff | 2010-08-03 |
| 7462957 | Multi-conductor plug and socket apparatus | Wendall Siemens, Derek W. Logan, Jili Liu | 2008-12-09 |
| 7252160 | Electromagnetic gap sub assembly | Tony Dopf, Derek W. Logan, Michael Nero, Clemens Horst, Robert E. Smallwood | 2007-08-07 |
| 6956791 | Apparatus for receiving downhole acoustic signals | Anthony R. Dopf, Wendall Siemens, Derek W. Logan | 2005-10-18 |
| 6816053 | Circuit to mitigate transformer shorted turn | Wendall Siemens | 2004-11-09 |
| 6572152 | Subassembly electrical isolation connector for drill rod | Anthony R. Dopf, Michael T. Sutherland | 2003-06-03 |