Patents/Inventors

Jung-chung Chen

ShanghaiCN4 patents

3 Patents

US125778062026
Narrow-type Door-lock Driving Device
Shanghai Ming Wei Hardware Co., Ltd.
0 cites
US125599872026
Switching Device for Delayed Unlocking Function
SHANGHAI MING WEI HARDWARE CO., Ltd.
0 cites
US124803362025
Delayed Unlocking Push-down Type Emergency Door-locking Device
Shanghai Ming Wei Hardware Co., Ltd.
0 cites