Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5836396 | Method of operating a downhole clutch assembly | — | 1998-11-17 |
| 5732777 | Well tubing suspension and rotator system | Allan D. Grimshaw | 1998-03-31 |
| 5642782 | Downhole clutch assembly | Allan D. Grimshaw | 1997-07-01 |