Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5010835 | Semi-submerged glass boat | Yasuhiro Harita | 1991-04-30 |
| 5002004 | Planing boat | Takeo Nojiri, Kazuaki Kurihara | 1991-03-26 |
| 4345533 | Semi-submerged ship | — | 1982-08-24 |
| 4309172 | Ship with improved stern structure | Hitoshi Narita, Hikaru Yagi | 1982-01-05 |