| 9022144 |
Drill bit assembly having electrically isolated gap joint for measurement of reservoir properties |
Brian Clark, Reza Taherian, Derek W. Logan, Garry Holmen, Aaron W. Logan +1 more |
2015-05-05 |
| 8648733 |
Electromagnetic telemetry assembly with protected antenna |
Derek W. Logan, Garry Holmen |
2014-02-11 |
| 8634274 |
Spindle for mud pulse telemetry applications |
Paul L. Camwell, David A. Switzer, Laura C. Neels-Slingerland |
2014-01-21 |
| 8624464 |
Brush and brush housing arrangement to mitigate hydrodynamic brush lift in fluid-immersed electric motors |
Paul L. Camwell, Derek W. Logan, Timothy Neff |
2014-01-07 |
| 8308199 |
Electrical isolation connector for electromagnetic gap sub |
Paul L. Camwell, Derek W. Logan, David D. Whalen, Thomas H. Vermeeren |
2012-11-13 |
| 8270251 |
Acoustic isolator |
Douglas S. Drumheller, Paul L. Camwell, Derek W. Logan |
2012-09-18 |
| 8174929 |
Spindle for mud pulse telemetry applications |
Paul L. Camwell, David A. Switzer, Laura C. Neels-Slingerland |
2012-05-08 |
| 7900968 |
Electrical isolation connector for electromagnetic gap sub |
Paul L. Camwell, Derek W. Logan, David D. Whalen, Thomas H. Vermeeren |
2011-03-08 |
| 7839719 |
Fluid erosion protection washer for rotating shaft in MWD tool |
Trang Le, Derek W. Logan, Timothy Neff, Wendall Siemens, Dave Switzer |
2010-11-23 |
| 7821178 |
Brush and brush housing arrangement to mitigate hydrodynamic brush lift in fluid-immersed electric motors |
Paul L. Camwell, Derek W. Logan, Timothy Neff |
2010-10-26 |
| 7532540 |
Fluid erosion protection washer for rotating shaft in MWD tool |
Trang Le, Derek W. Logan, Timothy Neff, Wendall Siemens, Dave Switzer |
2009-05-12 |
| 6956791 |
Apparatus for receiving downhole acoustic signals |
Paul L. Camwell, Wendall Siemens, Derek W. Logan |
2005-10-18 |
| 6902414 |
Harsh environment rotatable connector |
Derek W. Logan, David A. Switzer |
2005-06-07 |
| 6572152 |
Subassembly electrical isolation connector for drill rod |
Paul L. Camwell, Michael T. Sutherland |
2003-06-03 |
| 6367323 |
Dynamic pressure device for oil drill systems |
Paul L. Camwell, Michael T. Sutherland, Derek W. Logan, Randall S. Liscombe |
2002-04-09 |
| 6158532 |
Subassembly electrical isolation connector for drill rod |
Derek W. Logan, Paul L. Camwell |
2000-12-12 |
| 6050353 |
Subassembly electrical isolation connector for drill rod |
Derek W. Logan, Paul L. Camwell |
2000-04-18 |
