Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5191697 | Loudspeaker damper and method of manufacturing the same | Yoshio Sakamoto | 1993-03-09 |
| 5125473 | Speaker damper configuration | Yoshio Sakamoto | 1992-06-30 |
| 4674592 | Diaphragm for use in electro-acoustic transducer | Shuichi Aoki, Katsuyoshi Kumagai, Minoru Ito | 1987-06-23 |