Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4955195 | Fluid control circuit and method of operating pressure responsive equipment | Joseph L. LeMoine | 1990-09-11 |
| 4655431 | Ram-type blowout preventer | Paul E. Helfer | 1987-04-07 |
| 4638972 | Valve apparatus | Paul E. Helfer | 1987-01-27 |
| 4589625 | Hydraulically operated valves | — | 1986-05-20 |
| 4582293 | Hydraulically operated valves | — | 1986-04-15 |
| 4580626 | Blowout preventers having shear rams | — | 1986-04-08 |
| 4574662 | Device for removing a cork or other resilient stopper from the neck of a bottle | — | 1986-03-11 |
| 4531580 | Rotating blowout preventers | — | 1985-07-30 |
| 4519571 | Fluid operated, axially reciprocating actuator | Roland M. Howard, Jr. | 1985-05-28 |
| 4519577 | Flow controlling apparatus | — | 1985-05-28 |
| 4508313 | Valves | — | 1985-04-02 |
| 4488703 | Valve apparatus | — | 1984-12-18 |
| 4347898 | Shear ram blowout preventer | — | 1982-09-07 |
| 4265424 | Blowout preventer and improved ram packer structure | — | 1981-05-05 |
| 4223700 | Flow line switch | — | 1980-09-23 |