Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5038570 | Piston engine and cryo-cooler provided with such a piston engine | Johan Frederik Dijksman, Ronald Den Heyer, Adrianus H. Meesterburrie, Theodorus Franciscus Emilius Maria Overes | 1991-08-13 |
| 4920288 | Piston engine with dynamic groove bearing internal to piston and isolated from compression space | Ronald den Heijer, Godefridus Cornelis Goverde | 1990-04-24 |