HL

Huanfeng Liu

OE Otis Elevator: 1 patents #966 of 1,840Top 55%
Overall (All Time): #2,839,738 of 4,157,543Top 70%
1
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
10189680 Landing-door door lock device Yongtao Yang, Chong Chen, Hua Zhang, QingXi Cai, Junfeng Wu 2019-01-29