Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6016880 | Rotating drilling head with spaced apart seals | Douglas D. Hall | 2000-01-25 |
| 4655431 | Ram-type blowout preventer | Marvin R. Jones | 1987-04-07 |
| 4638972 | Valve apparatus | Marvin R. Jones | 1987-01-27 |