QC

Qing Cheng

OE Otis Elevator: 1 patents #966 of 1,840Top 55%
Overall (All Time): #2,764,726 of 4,157,543Top 70%
1
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
11192756 Safety control device for handrail, conveyor system and safety control method for handrail Hai Cui, Yi Fang, Xingsong Xu, Xinxiang Jiang, Jiaying CHEN +3 more 2021-12-07