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John Duffner — 2 Patents

Lexington Park, MD: #16 of 81 inventorsTop 20%
Maryland: #13,510 of 35,612 inventorsTop 40%
Overall (All Time): #1,709,992 of 4,157,543Top 45%
2 Patents All Time
John Duffner has been granted 2 US patents. The first was granted in 2021 and the most recent in December 2022. John Duffner ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list John Duffner in Lexington Park, MD, US.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
11536539 Selectable lug handgrip mount for a firearm — 2022-12-27
11054222 Selectable lug handgrip mount for a firearm — 2021-07-06

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