Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5683278 | Stern tube seal with a pressure control system to adjust to the changing draft of ocean-going ships | Gunter Pietsch, Holger Hillig, Ernst-Peter Von Bergen | 1997-11-04 |
| 5643026 | Safety device for seal systems for propeller shafts on ships | Gunter Pietsch, Holger Hillig, Ernst-Peter Von Bergen | 1997-07-01 |