Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7357145 | High-pressure, hemi-wedge cartridge valve | — | 2008-04-15 |
| 5507469 | Valve actuator system for initial torque reduction | — | 1996-04-16 |
| 5333834 | Valve driver | — | 1994-08-02 |
| 4962911 | Hemi-wedge valve | — | 1990-10-16 |
| 4681167 | Apparatus and method for automatically and periodically introducing a fluid into a producing oil well | — | 1987-07-21 |
| 4645007 | Tubing drain valve | — | 1987-02-24 |
| 4637471 | Tubing drain valve useful with heavy, sand-bearing oil | — | 1987-01-20 |
| 4565496 | Oil well pump system and method | — | 1986-01-21 |
| 4540348 | Oilwell pump system and method | — | 1985-09-10 |
| 4490095 | Oilwell pump system and method | — | 1984-12-25 |