David Roisen

📍 Dawson, MN: #1 of 5 inventorsTop 20%

🗺 Minnesota: #23,881 of 52,454 inventorsTop 50%

Overall (All Time): #2,352,653 of 4,157,543Top 60%

Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
4509273	Combine grain dryer and drying attachment	—	1985-04-09
4465316	Collapsible structure for use with a recreational vehicle	—	1984-08-14