Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6503072 | Pressure articulated positive displacement, single expansion rotary engine | — | 2003-01-07 |
| 5039290 | Rotary expander | — | 1991-08-13 |
| 4425509 | Turboflapper nozzle systems | Joannes N. M. de Jong, Richard L. Earle | 1984-01-10 |
| 4283780 | Resonant acoustic transducer system for a well drilling string | — | 1981-08-11 |
| 4181468 | Geothermal energy pump monitor and telemetric system | William H. Kent | 1980-01-01 |