Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5156207 | Hydraulically actuated downhole valve apparatus | David M. Haugen, Arnold G. Edwards | 1992-10-20 |
| 4372384 | Well completion method and apparatus | — | 1983-02-08 |
| 4185690 | Backsurge well cleaning tool | — | 1980-01-29 |