BA

by Geraldine J. Risgin, administratrix

📍 Ann Arbor, MI: #3,831 of 6,071 inventorsTop 65%
🗺 Michigan: #49,615 of 86,293 inventorsTop 60%
Overall (All Time): #4,033,009 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4443791 Self-compensating gas detection apparatus Ojars Risgin, deceased 1984-04-17