Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8953815 | Battery receiving mechanism for noise cancellation headphone | — | 2015-02-10 |
| 6120006 | Valve device | Seiji Yamaki, Kenichi Kawazoe | 2000-09-19 |
| D421791 | Double-seated control valve plug | Hideo Ohtani, Ryoji Okutsu | 2000-03-21 |