Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4821246 | Electromagnetic vibrator for seismic and civil-engineering applications | Willem Antoon Van Kampen, Anne R. Ritsema | 1989-04-11 |
| 4287861 | Reciprocating internal-combustion engine | Kurt Lettner, Eugen Egger | 1981-09-08 |