Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5251702 | Surface controlled subsurface safety valve | — | 1993-10-12 |
| 4691893 | Fail safe gate valves and actuators therefor | Neil H. Akkerman | 1987-09-08 |
| 4527631 | Subsurface safety valve | — | 1985-07-09 |
| 4467866 | Flow controlling apparatus | Neil H. Akkerman | 1984-08-28 |
| 4434847 | Flow controlling apparatus | Neil H. Akkerman | 1984-03-06 |
| 4398600 | Systems for landing wire line tools at selected levels within a well tubing string | — | 1983-08-16 |
| 4345651 | Apparatus and method for the mechanical sequential release of cementing plugs | Neil H. Akkerman | 1982-08-24 |
| 4225110 | Actuator for converting linear to rotary motion | Neil H. Akkerman, Stephen R. Foster | 1980-09-30 |