Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6263073 | Method of improving the CAS tone signal detection of a telephone and the apparatus therefor | Bang-Hua Mao, Jia-Guo Han, Jiang Gao | 2001-07-17 |
| 6128372 | Extension device for telephone | Hong-Chang Tsai, Yong Pan, Yifeng Qian | 2000-10-03 |