Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5699758 | Method and apparatus for multiple cycle internal combustion engine operation | — | 1997-12-23 |
| 5647307 | Valving for dual compression/expansion engine and method of assembling the same | David E. Hackett | 1997-07-15 |
| 5623894 | Dual compression and dual expansion engine | — | 1997-04-29 |