Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10511900 | Headphone | Daisuke Yoneyama, Koji Otsuka | 2019-12-17 |
| 10249287 | Noise-cancelling headphone | Koji Otsuka, Daisuke Yoneyama | 2019-04-02 |
| 10204615 | Noise-cancelling headphone | Koji Otsuka, Kozo Ando | 2019-02-12 |
| 9959858 | Noise-cancelling headphone | Koji Otsuka, Kozo Ando | 2018-05-01 |
| 9913020 | Noise-cancelling headphone | Koji Otsuka, Kozo Ando | 2018-03-06 |