RH

Ralph P. Hill

📍 Tigard, OR: #430 of 696 inventorsTop 65%
🗺 Oregon: #17,068 of 28,073 inventorsTop 65%
Overall (All Time): #3,984,989 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4704876 Cryogenic refrigeration system — 1987-11-10