John D. Cowan

📍 Columbus, OH: #41 of 180 inventorsTop 25%

🗺 Ohio: #715 of 3,574 inventorsTop 25%

Overall (1989): #96,025 of 140,708Top 70%

Patents 1989

Issued Patents 1989

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4852319	Combination void drain vent chain	—	1989-08-01