Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9641023 | Standby power supply circuit for 2-wire bus intercom system and apparatus thereof | Yangpeng Zhang, Mingyuan Liu, Huaping Li, Zhitian Ye | 2017-05-02 |
| 9203379 | Electronic inductance circuit for the power supply of a 2-wire bus intercom system and a device thereof | Yangpeng Zhang, Mingyuan Liu | 2015-12-01 |
| 9042533 | Dual-channel analog door entry system and a method thereof | Jinshu Chen, Xiaoping Zhou, Yangpeng Zhang | 2015-05-26 |