Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9221530 | Ship propulsion system and ship equipped therewith | — | 2015-12-29 |
| 6431929 | Drive system | Wilhelm Schafer | 2002-08-13 |
| 6050865 | Ship drive with a drive engine and directly drive propeller shaft | Wilhelm Schafer | 2000-04-18 |