Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5325803 | Icebreaking ship | Peter Jans, Jens-Holger Hellmann | 1994-07-05 |
| 5231944 | Icebreaking ship | Peter Jans, Jens-Holger Hellmann | 1993-08-03 |
| 4942837 | Ice breaker | Jens-Holger Hellmann, Richard Holscher, Hermann J. Janssen, Alfred Kleemann, Joachim Schwarz +2 more | 1990-07-24 |
| 4800831 | Ice breaker | Jens-Holger Hellmann, Gunter Varges | 1989-01-31 |
| 4383632 | Recording and/or reproducing apparatus | Henricus M. Ruyten | 1983-05-17 |