Issued Patents 2019
Showing 1–3 of 3 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 |