Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11991509 | Audio processing device and method | Akihide Shigihara, Toshimitsu Uchiyama, Wataru Murata, Kiyofumi Maruyama | 2024-05-21 |
| 10491990 | Throat and speaker system | Akihide Shigihara | 2019-11-26 |
| 7631724 | Sound-wave path-length correcting structure for speaker system | — | 2009-12-15 |