Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D1077773 | Noise canceling headphone | Jianfeng Xiong | 2025-06-03 |
| D990450 | Noise-canceling headphones | Jianfeng Xiong | 2023-06-27 |
| 8601043 | Equalizer using infinitive impulse response filtering and associated method | Hung-Kun Chen, Zhi-Ren Chang | 2013-12-03 |
| 8532314 | Audio volume control circuit and method thereof | Yi-Lin Lee, Zhi-Ren Chang | 2013-09-10 |