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, Hiroyuki Tomiyama | 2004-11-09 |
| 6744896 | Electret microphone | Haruhisa Tanabe, Keiji Watanabe | 2004-06-01 |