Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6948917 | Valving system for a downhole hydraulically actuated pump | — | 2005-09-27 |
| 4925374 | Down hole hydraulically actuated pump | — | 1990-05-15 |
| 4350082 | Pump piston having ring lubrication means | — | 1982-09-21 |
| 4293287 | Reversing valve assembly for a fluid operated well pump | — | 1981-10-06 |