Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33526 | Power tongs and control system | — | 1991-01-29 |
| 4718314 | Power chain wrench | Dennis J. Penisson | 1988-01-12 |
| 4712284 | Power tongs with hydraulic friction grip for speciality tubing | Dennis J. Penisson | 1987-12-15 |
| 4679469 | Power tongs controller with persisting torque | — | 1987-07-14 |
| 4579024 | Power tongs and control system | — | 1986-04-01 |
| 4552041 | Power tongs control system | — | 1985-11-12 |
| 4479538 | Casing scraper and method for making the same | — | 1984-10-30 |
| 4381584 | Dual string spider | — | 1983-05-03 |
| 4354706 | Dual string elevators | — | 1982-10-19 |