Ko-Yu Chang

DHDoor & Window Hardware: 1 patents #6 of 13Top 50%

Overall (All Time): #1,905,249 of 4,157,543Top 50%

2 Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
10627186	Crossbow with Belleville springs	—	2020-04-21
10448754	Clamp	Wei-Hung Chang	2019-10-22