Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8757298 | Method and apparatus for dual speed, dual torque drilling | — | 2014-06-24 |
| 7562725 | Downhole pilot bit and reamer with maximized mud motor dimensions | Herman J. Schellstede | 2009-07-21 |