Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5921336 | Walking substructure device | — | 1999-07-13 |
| 5570749 | Drilling fluid remediation system | — | 1996-11-05 |
| 4903443 | Derrick having upper and lower crown block positions | — | 1990-02-27 |
| 4875530 | Automatic drilling system | Tommy S. Frink, Dwayne V. Cochran, Will L. McNair | 1989-10-24 |
| 4836300 | Method of performing drilling operations from a derrick | — | 1989-06-06 |
| 4796863 | Dual cluster crown block | — | 1989-01-10 |
| 4757592 | Method of erecting a portable drilling rig | — | 1988-07-19 |
| 4744710 | Drilling derrick with external pipe storage | — | 1988-05-17 |
| 4676484 | Helicopter transportable traveling block | — | 1987-06-30 |
| 4630425 | Erection means for portable drilling system | — | 1986-12-23 |
| 4590720 | Telescoping derrick | — | 1986-05-27 |
| 4473977 | Erection means for portable drilling system | — | 1984-10-02 |