Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5668886 | Loudspeaker structure | Yoshio Sakamoto | 1997-09-16 |
| 5031720 | Speaker diaphragm | Masakatu Sakamoto, Shiro Iwakura, Yoshikazu Shirasaki, Ichiro Yoshida | 1991-07-16 |
| 4772513 | Method for forming a hard carbon thin film on article and applications thereof | Masakatsu Sakamoto, Shiro Iwakura, Kaoru Yamazaki, Yoichi Yaguchi, Hiroaki Toshima +1 more | 1988-09-20 |
| 4725345 | Method for forming a hard carbon thin film on article and applications thereof | Masakatsu Sakamoto, Shiro Iwakura, Kaoru Yamazaki, Yoichi Yaguchi, Hiroaki Toshima +1 more | 1988-02-16 |