Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6886485 | Twin-rudder system for large ship | Yukio Tomita, Kenjiro Nabeshima, Takanori Wakabayashi | 2005-05-03 |
| 5520137 | Twin-hull boat with hydrofoils | Kensaku Takenaka, Yoshitada Hiramatsu, Masayuki Segawa, Hiromasa Sugimura, Ryohei Takeuchi +3 more | 1996-05-28 |
| 5408948 | Twin-hull boat with hydrofoils and control system | Isamu Takenaka, Katsuaki Fujiya, Tadao Takai, Yuki NAKAGAWA, Yasuo Nakai | 1995-04-25 |