RD

Richard L. Dufern

📍 Carpentersville, IL: #93 of 157 inventorsTop 60%
🗺 Illinois: #48,934 of 84,256 inventorsTop 60%
Overall (All Time): #3,864,425 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
5167209 Engine filter assembly George Riddiford 1992-12-01