Issued Patents 2018
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9963940 | Rotary drill bits comprising maraging steel and methods of forming such drill bits | Xiaomin Cheng, Eric C. Sullivan | 2018-05-08 |
| 9920614 | Apparatus and method for drilling wellbores based on mechanical specific energy determined from bit-based weight and torque sensors | Eric C. Sullivan, Lane E. Snell | 2018-03-20 |