Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5317876 | Sound wave operated energy corverter for producing different forms of movement | Katsumi Nakagawa, Koji Nishida | 1994-06-07 |
| 5299422 | Energy converter | Katsumi Nakagawa, Koji Nishida | 1994-04-05 |