DC

Der-Feng Chang

UN Unknown: 1 patents #29,356 of 83,584Top 40%
📍 Guoxing Township, TW: #95 of 230 inventorsTop 45%
Overall (All Time): #2,293,031 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5295607 Trash tank 1994-03-22
5213228 Trash tank 1993-05-25