HL

Huanfeng Liu

OE Otis Elevator: 1 patents #100 of 260Top 40%
Overall (2019): #439,874 of 560,194Top 80%
1
Patents 2019

Issued Patents 2019

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