Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4537383 | Valve | — | 1985-08-27 | $3,399,000 |
| 4453599 | Method and apparatus for controlling a well | — | 1984-06-12 | $8,755,000 |
| RE31313 | Method and system for well testing | Phillip S. Sizer | 1983-07-19 | |
| 4289201 | Well test apparatus | — | 1981-09-15 | $9,126,000 |
| 4289165 | Equalizing ball valve member | — | 1981-09-15 | $9,126,000 |
| 4280561 | Valve | — | 1981-07-28 | $48,613,000 |
| 4274485 | Method and system for well testing | — | 1981-06-23 | $14,841,000 |
| 4274486 | Apparatus for and method of operating a well | — | 1981-06-23 | $14,841,000 |
| 4266614 | Valve | — | 1981-05-12 | $18,786,000 |
| 4252195 | Well test systems and methods | — | 1981-02-24 | $6,387,000 |
| 4252188 | Actuator | — | 1981-02-24 | $6,387,000 |
| 4252143 | Actuator | — | 1981-02-24 | $6,387,000 |
| 4230185 | Rod operated rotary well valve | — | 1980-10-28 | $11,228,000 |
| 4216830 | Flapper valve | — | 1980-08-12 | $7,927,000 |