Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9463856 | Ship of contrarotating propeller propulsion type | Daisuke Matsumoto, Shingen Takeda, Ryota Kuroiwa | 2016-10-11 |
| 4632403 | Stern tube seal device providing a seal about a rotatable shaft | Kenichiro Ishitani, Saburo Amiboshi, Eiichi Kawamura | 1986-12-30 |
| 4534569 | Stern tube seal device providing a seal about a rotatable shaft | Kenichiro Ishitani, Saburo Amiboshi, Eiichi Kawamura | 1985-08-13 |