Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6814181 | Electrically conductive damper device for speaker | Yasuhisa Abe, Koji Matsumoto, Koji Takayama | 2004-11-09 |
| 6772855 | Damper for speaker and method of producing the same | Masatoshi Sato, Satoshi Hachiya | 2004-08-10 |