RD

Robert O. Duff

📍 Apple Valley, MN: #6 of 33 inventorsTop 20%
🗺 Minnesota: #807 of 5,562 inventorsTop 15%
Overall (2025): #91,838 of 469,880Top 20%
2
Patents 2025

Issued Patents 2025

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
12252912 Doorstop with replaceable parts 2025-03-18
12252927 Mounting bracket 2025-03-18