Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7300035 | Valve, actuator and control system therefor | Albert S. Davis, John M. Saldivar, David R. Mefford, Frank J. Arriens, Daryl Ard +3 more | 2007-11-27 |
| 5435520 | Backseat assembly for an expanding gate valve | — | 1995-07-25 |
| 4718679 | Lockdown ring assembly for wellhead seal | — | 1988-01-12 |
| 4213480 | Manual override for hydraulic gate valve actuators | Paul R. Orum | 1980-07-22 |