Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4723474 | Pneumatic stepping actuator positioner | — | 1988-02-09 |
| 4700739 | Pneumatic well casing pressure regulating system | — | 1987-10-20 |
| 4630675 | Drilling choke pressure limiting control system | Lawrence E. Neipling | 1986-12-23 |