John Chao Chang

OE Otis Elevator: 1 patents #966 of 1,840Top 55%

📍 Cheshire, CT: #346 of 532 inventorsTop 70%

🗺 Connecticut: #21,355 of 34,797 inventorsTop 65%

Overall (All Time): #3,848,422 of 4,157,543Top 95%

Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
5105916	Elevator door coupling device	Robert J. Steacy	1992-04-21