Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7783059 | Acoustic device | Yoshihide Koyama | 2010-08-24 |
| 7564983 | Audio playback device capable of independent operations in dual modes | Akira Ibuka, Yoshihide Koyama | 2009-07-21 |
| 7436738 | Play-back device | Yoshihide Koyama | 2008-10-14 |