DS

Douglas C. Sperr

📍 Scottsdale, AZ: #28 of 109 inventorsTop 30%
🗺 Arizona: #166 of 945 inventorsTop 20%
Overall (1989): #118,945 of 140,708Top 85%
1
Patents 1989

Issued Patents 1989

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4851162 Evaporative cooler Charles J. Sperr, Jr. 1989-07-25