Du Dai — 1 Patent in 2018

OEOtis Elevator: 1 patents #73 of 232Top 35%

Shanghai, CN: #760 of 2,595 inventorsTop 30%

Overall (2018): #431,293 of 503,207Top 90%

1 Patents 2018

Issued Patents 2018

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
9994428	Brake for use in passenger conveyor system	Alois Senger, Jian Cheng	2018-06-12