| 5346329 |
Floating barrier method and apparatus |
Richard J. Lazes |
1994-09-13 |
| 5317954 |
Pressure switch assembly |
— |
1994-06-07 |
| 5312204 |
Floating barrier apparatus |
— |
1994-05-17 |
| 5308191 |
Floating barrier method and apparatus |
— |
1994-05-03 |
| 5195844 |
Floating barrier method and apparatus |
— |
1993-03-23 |
| 5155310 |
Pressure switch assembly |
— |
1992-10-13 |
| 5022785 |
Floating barrier method and apparatus |
— |
1991-06-11 |
| 4852394 |
Anti-extrusion sealing means |
— |
1989-08-01 |
| 4838303 |
Buoyancy operable liquid level sensor for controlling an alarm pressure fluid supply responsive to changes of liquid level in a pressure vessel |
— |
1989-06-13 |
| 4831957 |
First trip indicator for sensing devices of production control and safety systems |
— |
1989-05-23 |
| 4790354 |
Manual relay valve |
— |
1988-12-13 |
| 4552222 |
Fusible-elements holder bracket device |
Ruel R. Gober |
1985-11-12 |
| 4479506 |
Conduit blowout preventer |
— |
1984-10-30 |
| 4470340 |
Locking mechanism for fluid operated actuator |
Neil H. Akkerman |
1984-09-11 |
| 4462301 |
Bourdon tube actuator |
— |
1984-07-31 |
| 4442756 |
Heat sensitive locking device |
— |
1984-04-17 |
| 4442757 |
Fluid pressure actuator having bias element immersed in non-corrosive environment |
— |
1984-04-17 |
| 4436105 |
Valve actuator having an adjustable collet lock |
— |
1984-03-13 |
| 4422503 |
Control line blow out preventer |
— |
1983-12-27 |
| 4413651 |
Diaphragm valve and method |
— |
1983-11-08 |
| 4372333 |
Valve actuating apparatus and method |
— |
1983-02-08 |
| 4279272 |
Flow line monitor pilot valve assembly |
Neil H. Akkerman, Stephen R. Foster |
1981-07-21 |
| 4263839 |
Heat sensitive locking device |
Neil H. Akkerman |
1981-04-28 |
| 4202368 |
Safety valve or blowout preventer for use in a fluid transmission conduit |
Neil H. Akkerman |
1980-05-13 |