Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D606049 | Earphone | Takeshi Matsuda, Kenji Hatano, Masaji Komuro | 2009-12-15 |
| D599785 | Earphone | Takeshi Matsuda, Kenji Hatano, Masaji Komuro | 2009-09-08 |
| D598010 | Pair of earphones | Takeshi Matsuda, Kenji Hatano, Masaji Komuro | 2009-08-11 |