Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6751330 | Speaker system | Akira Nishikawa, Katsuhiko Tsumori, Hiroyuki Yoshii | 2004-06-15 |
| 6724909 | Speaker apparatus | Katsuhiko Tsumori, Akira Nishikawa, Hiroyuki Yoshii | 2004-04-20 |
| 6678384 | Speaker structure | Hiroyuki Yoshii | 2004-01-13 |