Issued Patents 2019
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10427914 | Elevator synchronous door knife | Xiaobo ZHANG, XiaoXiao Dong, Chong Chen | 2019-10-01 |
| 10189680 | Landing-door door lock device | Yongtao Yang, Huanfeng Liu, Chong Chen, Hua Zhang, Junfeng Wu | 2019-01-29 |