Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6056509 | Contra-rotating bearing device for contra-rotating propeller | Mikihiko Nakayama, Shinichi Ohtani, Kazuhide Ohta, Keiichi Nitta, Satoshi Keirimbo +2 more | 2000-05-02 |