Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880056 | Hydraulically activated firing head for well perforating guns | Gregg W. Stout | 1989-11-14 |
| 4817718 | Hydraulically activated firing head for well perforating guns | Gregg W. Stout | 1989-04-04 |