Issued Patents All Time
Showing 51–75 of 76 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4477104 | Releasable latching apparatus | — | 1984-10-16 |
| 4475599 | Valve for subterranean wells | — | 1984-10-09 |
| 4470340 | Locking mechanism for fluid operated actuator | Kip B. Goans | 1984-09-11 |
| 4467866 | Flow controlling apparatus | Gonzalo Vazquez | 1984-08-28 |
| 4460048 | Pump through equalizing check valve for use in intermittent gas lift well | Everett H. Smith | 1984-07-17 |
| 4440223 | Well slip assemblies | — | 1984-04-03 |
| 4434847 | Flow controlling apparatus | Gonzalo Vazquez | 1984-03-06 |
| 4421174 | Cyclic annulus pressure controlled oil well flow valve and method | David M. McStravick | 1983-12-20 |
| 4407363 | Subsurface well apparatus | — | 1983-10-04 |
| 4396066 | Method and apparatus for effecting sealed connection to upstanding irregular end of tubing positioned in a well | Aubrey C. Mills | 1983-08-02 |
| 4393929 | Well packers and slip assemblies for use therewith | — | 1983-07-19 |
| 4374487 | Pilot with cantilevered spring | Bruce D. Christensen | 1983-02-22 |
| 4349175 | Valve actuator having a continuously charged accumulator | Stephen R. Foster | 1982-09-14 |
| 4345651 | Apparatus and method for the mechanical sequential release of cementing plugs | Gonzalo Vazquez | 1982-08-24 |
| 4325431 | Flow controlling apparatus | — | 1982-04-20 |
| 4325402 | Bimodal, non-venting pneumatic relay | Bruce D. Christensen | 1982-04-20 |
| 4297087 | Apparatus for pumping fluid from a well through a tubing string | — | 1981-10-27 |
| 4297088 | Pump assembly comprising gas spring means | — | 1981-10-27 |
| 4279272 | Flow line monitor pilot valve assembly | Stephen R. Foster, Kip B. Goans | 1981-07-21 |
| 4263839 | Heat sensitive locking device | Kip B. Goans | 1981-04-28 |
| 4248138 | Fail safe locking mechanism for fluid operated valve actuator | — | 1981-02-03 |
| 4225110 | Actuator for converting linear to rotary motion | Stephen R. Foster, Gonzalo Vazquez | 1980-09-30 |
| 4202368 | Safety valve or blowout preventer for use in a fluid transmission conduit | Kip B. Goans | 1980-05-13 |
| 4187870 | Valve actuator and pilot assembly therefor | — | 1980-02-12 |
| 4188011 | Spool valve and pilot interface assembly | — | 1980-02-12 |