Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10480285 | Energy saving downhole and subsea valve | Henning Hansen, Tarald Gudmestad | 2019-11-19 |
| 4643079 | Iron piston having selectively hardened ring groove | David E. Brann | 1987-02-17 |