Charles J. Sperr, Jr.

📍 Scottsdale, AZ: #28 of 109 inventorsTop 30%

🗺 Arizona: #166 of 945 inventorsTop 20%

Overall (1989): #125,498 of 140,708Top 90%

Patents 1989

Issued Patents 1989

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4851162	Evaporative cooler	Douglas C. Sperr	1989-07-25