Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4963108 | Marine contra-rotating propeller drive system | Kazuyuki Araki | 1990-10-16 |
| 4786264 | Stern tube bearing system of contra-rotating propeller | Sadao Asanabe, Kunio Saki, Susumu Matsumoto, Susumu Taniguchi, Shozo Morohoshi | 1988-11-22 |