Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9473847 | Acoustic apparatus | Koji Okazaki, Hirofumi Onitsuka | 2016-10-18 |
| 9407983 | Microphone device | Kunihiro Kumagai, Shuichi Esaki, Hirofumi Onitsuka, Kiyohiko Goto, Yoshiaki Tsutsui | 2016-08-02 |
| 9224380 | Audio device, and methods for designing and making the audio devices | Hirofumi Onitsuka | 2015-12-29 |
| 8820471 | Speaker | Koji Okazaki, Ryo Hadano | 2014-09-02 |
| 8731224 | Acoustic structure including helmholtz resonator | Hirofumi Onitsuka | 2014-05-20 |
| 8678130 | Audio apparatus | Hirofumi Onitsuka, Akira Miki | 2014-03-25 |