Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6032742 | Blowout preventer control system | Dan Pesek, Charles P. Peterman | 2000-03-07 |
| 5409040 | Springless pilot operated sequence valve | — | 1995-04-25 |
| 4887643 | Pilot actuated spool valve | Ingo Olejak | 1989-12-19 |
| 4699355 | Fail-safe fluid piloted valve positioner with hydromechanical position lock | Ronald L. Loup | 1987-10-13 |
| 4565349 | Fail safe hydraulic piloted pressure reducing and regulating valve | — | 1986-01-21 |
| 4519636 | Seal for an underwater connector | Gustave S. Levey, Michael A. O'Neil | 1985-05-28 |
| 4453566 | Hydraulic subsea control system with disconnect | Herman O. Henderson, Jr., Joseph L. LeMoine | 1984-06-12 |
| 4385746 | Four-way plug valve | Herbert H. Hodgeman | 1983-05-31 |
| 4320777 | Actuator mechanism for lift-turn valves | James N. Strickland | 1982-03-23 |
| 4286625 | Four-way plug valve | Herbert H. Hodgeman | 1981-09-01 |