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Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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David A. Endrigo — 8 Patents

UNUnknown: 1 patents #29,356 of 83,584Top 40%
Poulsbo, WA: #18 of 134 inventorsTop 15%
Washington: #13,119 of 76,902 inventorsTop 20%
Overall (All Time): #600,572 of 4,157,543Top 15%
8 Patents All Time
David A. Endrigo has been granted 8 US patents while listed as an inventor at Unknown. The first was granted in 1996 and the most recent in May 2024. David A. Endrigo ranks #600,572 of 4,157,543 US inventors in our database (top 14.4%). Patent records list David A. Endrigo in Poulsbo, WA, US.

Patents per Year

Patents granted per year, 1996 to 2024Bar chart with a peak of 2 patents in 2022.peak 21996: 1 patents19962010: 1 patents20102011: 1 patents20112012: 1 patents20122014: 1 patents20142022: 2 patents20222024: 1 patents2024

Issued Patents All Time

Showing 1–8 of 8 patents

Patent #TitleCo-InventorsDate
11982216 Emissions reduction systems and methods 2024-05-14
11519318 Emissions reduction systems and methods 2022-12-06
11220948 Emissions reduction systems and methods 2022-01-11
8765084 High-efficiency catalytic converters for treating exhaust gases Todd K. Hansen 2014-07-01
8298504 High-efficiency catalytic converters for treating exhaust gases Todd K. Hansen 2012-10-30
8034310 High-efficiency catalytic converters for treating exhaust gases Todd K. Hansen 2011-10-11
7807120 High-efficiency catalytic converters for treating exhaust gases Todd K. Hansen 2010-10-05
5549085 Deflector insert for air filters 1996-08-27