Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5038695 | Icebreaker | — | 1991-08-13 |
| 4942837 | Ice breaker | Jens-Holger Hellmann, Richard Holscher, Hermann J. Janssen, Alfred Kleemann, Karl-Heinz Rupp +2 more | 1990-07-24 |
| 4800831 | Ice breaker | Jens-Holger Hellmann, Karl-Heinz Rupp | 1989-01-31 |
| 4732101 | Stern apron for ice breakers | — | 1988-03-22 |
| 4506617 | Ship | Heinrich Waas, Ayres Freitas, Jurgen M. Schultz | 1985-03-26 |