Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5117463 | Speaker system having directivity | Hideaki Morikawa, Yasuo Gan, Naobumi Kanemaki | 1992-05-26 |
| 4991687 | Speaker system having directivity | Hideaki Morikawa, Yasuo Gan, Naobumi Kanemaki | 1991-02-12 |
| 4461932 | Ribbon type speaker and method of assembling magnetic circuit thereof | — | 1984-07-24 |