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Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Duane Campbell — 4 Patents

Microsoft: 4 patents #10,758 of 40,388Top 30%
Sammamish, WA: #1,035 of 2,558 inventorsTop 45%
Washington: #23,275 of 76,902 inventorsTop 35%
Overall (All Time): #1,080,739 of 4,157,543Top 30%
4 Patents All Time
Duane Campbell has been granted 4 US patents while listed as an inventor at Microsoft. The first was granted in 2009 and the most recent in March 2021. Duane Campbell ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list Duane Campbell in Sammamish, WA, US.

Patents per Year

Patents granted per year, 2009 to 2021Bar chart with a peak of 1 patents in 2009.peak 12009: 1 patents20092011: 1 patents20112019: 1 patents20192021: 1 patents2021

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
10936797 Collaborative document editing using state-based revision Nicholas Ryan, Danny Khen, Jenefer Monroe, Alexander Babanov, Kartik Nathan +4 more 2021-03-02 $181,927,000
10331775 Collaborative document editing using state-based revision Nicholas Ryan, Danny Khen, Jenefer Monroe, Alexander Babanov, Kartik Nathan +4 more 2019-06-25 $55,928,000
8032821 Multi-thread spreadsheet processing with dependency levels Jeffrey James Duzak, Andrew J. Becker, Matthew J. Androski 2011-10-04 $15,454,000
7533139 Method and system for multithread processing of spreadsheet chain calculations Bruce Cordell Jones, Chad Rothschiller, David F. Gainer, Jeffrey James Duzak, Matthew J. Androski 2009-05-12 $25,255,000