Issued Patents All Time
Showing 126–141 of 141 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9528370 | Fluid pressure pulse generating apparatus with primary seal assembly, back up seal assembly and pressure compensation device and method of operating same | Justin C. Logan, David A. Switzer | 2016-12-27 |
| 9523246 | Centralizer for downhole probes | Justin C. Logan, Patrick R. Derkacz | 2016-12-20 |
| 9512716 | System and method for regulating an electromagnetic telemetry signal sent from downhole to surface | Jili Liu, David A. Switzer, Jinhua Wang | 2016-12-06 |
| 9500075 | Measurement while drilling fluid pressure pulse generator | Justin C. Logan | 2016-11-22 |
| 9494035 | Fluid pressure pulse generator and method of using same | David A. Switzer, Justin C. Logan, Jili Liu | 2016-11-15 |
| 9476297 | Telemetry systems with compensation for signal degradation and related methods | Jili Liu, David A. Switzer | 2016-10-25 |
| 9476296 | Fluid pressure pulse generating apparatus with primary seal assembly, back up seal assembly and pressure compensation device and method of operating same | Justin C. Logan, David A. Switzer | 2016-10-25 |
| 9464519 | Method and apparatus for detecting gamma radiation downhole | Jili Liu, David A. Switzer, Mojtaba Kazemi Miraki | 2016-10-11 |
| 9464521 | Fluid pressure pulse generating apparatus with pressure compensation device and pulser assembly housing | Justin C. Logan | 2016-10-11 |
| 9453410 | Mud hammer | Justin C. Logan | 2016-09-27 |
| 9435196 | Downhole electromagnetic and mud pulse telemetry apparatus | David A. Switzer, Jili Liu, Mingdong Xu | 2016-09-06 |
| 9422809 | Fluid pressure pulse generator and method of using same | David A. Switzer, Justin C. Logan, Jili Liu | 2016-08-23 |
| 9291049 | Downhole electromagnetic and mud pulse telemetry apparatus | David A. Switzer, Jili Liu, Mingdong Xu | 2016-03-22 |
| 9109403 | Drill bit assembly having electrically isolated gap joint for electromagnetic telemetry | Derek W. Logan, Garry Holmen, Tony Dopf, Rob Utter, Brian Clark +1 more | 2015-08-18 |
| 9022144 | Drill bit assembly having electrically isolated gap joint for measurement of reservoir properties | Brian Clark, Reza Taherian, Derek W. Logan, Garry Holmen, Anthony R. Dopf +1 more | 2015-05-05 |
| 9004196 | Drill bit assembly having aligned features | Kjell Haugvaldstad, Derek W. Logan, Garry Holmen, Tony Dopf, Rob Utter | 2015-04-14 |