RB

Robert L. Birkeland

📍 Mound, MN: #125 of 212 inventorsTop 60%
🗺 Minnesota: #32,449 of 52,454 inventorsTop 65%
Overall (All Time): #3,902,189 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4922935 Dental hygiene device — 1990-05-08