Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5031720 | Speaker diaphragm | Shuhei Ohta, Shiro Iwakura, Yoshikazu Shirasaki, Ichiro Yoshida | 1991-07-16 |
| 4987002 | Process for forming a crystalline diamond film | Youichi Yaguchi, Hiroaki Toshima, Toshiroh Kotaki | 1991-01-22 |