RD

Robert O. Duff

📍 Apple Valley, MN: #97 of 500 inventorsTop 20%
🗺 Minnesota: #10,397 of 52,454 inventorsTop 20%
Overall (All Time): #678,285 of 4,157,543Top 20%
7
Patents All Time

Issued Patents All Time

Showing 1–7 of 7 patents

Patent #TitleCo-InventorsDate
12252912 Doorstop with replaceable parts 2025-03-18
12252927 Mounting bracket 2025-03-18
12084900 Doorstop with a rope 2024-09-10
9284765 Combination doorbumper/doorstopper 2016-03-15
8960739 Multi-functional doorstop tool Rosetta Duff 2015-02-24
7976080 Doorstop with releasably securable handle 2011-07-12
6557915 Portable doorstop with ergonomic advantages 2003-05-06