RD

Robert O. Duff

📍 Apple Valley, MN: #15 of 55 inventorsTop 30%
🗺 Minnesota: #1,525 of 4,860 inventorsTop 35%
Overall (2003): #131,646 of 273,478Top 50%
1
Patents 2003

Issued Patents 2003

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
6557915 Portable doorstop with ergonomic advantages — 2003-05-06