Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5933508 | Horn speaker system | Katsuya Endo, Yoshiteru Kamatani | 1999-08-03 |
| 5757942 | Speaker unit with an improved acoustic equalizer | Yoshiteru Kamatani | 1998-05-26 |
| 4726443 | Diaphragm | Masana Ugaji, Shinichi Watanabe, Hiroyuki Sogawa, Masatsugu Maejima, Koichi Saruwatari | 1988-02-23 |
| 4471084 | Diaphragm for loudspeakers | Toshikatsu Kuwahata, Toshihiro Fukuhara, Yoshiaki Suzuki | 1984-09-11 |