Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7308750 | Method of manufacturing a magnesium diaphragm | Hiroyuki Tomiyama, Masatoshi Sato, Yuichi Kasahara | 2007-12-18 |
| 7027609 | Diaphragm for speakers | Junichi Sato, Akira Otake | 2006-04-11 |