Issued Patents All Time
Showing 1–25 of 26 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5626106 | Migrating combustion chamber engine | Jeffrey Erickson | 1997-05-06 |
| 5341774 | Self supercharged two stroked cycle and engine having migrating combustion chambers | — | 1994-08-30 |
| 5253619 | Hydraulically powered actuator with pneumatic spring and hydraulic latching | William E. Richeson | 1993-10-19 |
| 5248123 | Pilot operated hydraulic valve actuator | William E. Richeson | 1993-09-28 |
| 5221072 | Resilient hydraulic actuator | William E. Richeson | 1993-06-22 |
| 5203535 | Cam actuated valve assembly with hydraulic spring | William E. Richeson | 1993-04-20 |
| 5189996 | Two-stroke-cycle engine with variable valve timing | William E. Richeson | 1993-03-02 |
| 5152260 | Highly efficient pneumatically powered hydraulically latched actuator | William E. Richeson | 1992-10-06 |
| 5109812 | Pneumatic preloaded actuator | William E. Richeson | 1992-05-05 |
| 5083533 | Two-stroke-cycle engine with variable valve timing | William E. Richeson | 1992-01-28 |
| 5058538 | Hydraulically propelled phneumatically returned valve actuator | William E. Richeson | 1991-10-22 |
| 5029516 | Pneumatically powered valve actuator | William E. Richeson | 1991-07-09 |
| 5022359 | Actuator with energy recovery return | William E. Richeson | 1991-06-11 |
| 5003938 | Pneumatically powered valve actuator | William E. Richeson | 1991-04-02 |
| 4991548 | Compact valve actuator | William E. Richeson | 1991-02-12 |
| 4967702 | Fast acting valve | William E. Richeson | 1990-11-06 |
| 4942852 | Electro-pneumatic actuator | William E. Richeson | 1990-07-24 |
| 4915015 | Pneumatic actuator | William E. Richeson | 1990-04-10 |
| 4878464 | Pneumatic bistable electronic valve actuator | William E. Richeson | 1989-11-07 |
| 4875441 | Enhanced efficiency valve actuator | William E. Richeson | 1989-10-24 |
| 4872425 | Air powered valve actuator | William E. Richeson | 1989-10-10 |
| 4852528 | Pneumatic actuator with permanent magnet control valve latching | William E. Richeson | 1989-08-01 |
| 4437437 | Dual-expansion internal combustion cycle and engine | — | 1984-03-20 |
| 4353331 | Dual-expansion internal combustion engine utilizing an oscillating piston inside an oscillating piston | — | 1982-10-12 |
| 4330895 | Stabilizer for reducing motion of an object disposed in a fluid | Stephen Putman | 1982-05-25 |