Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025
WT

Willis E. Tupper — 6 Patents

DIDapco Industries: 3 patents #3 of 12Top 25%
DMDavco Manufacturing: 2 patents #2 of 4Top 50%
Pinckney, MI: #51 of 221 inventorsTop 25%
Michigan: #15,670 of 86,293 inventorsTop 20%
Overall (All Time): #879,362 of 4,157,543Top 25%
6 Patents All Time

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #TitleCo-InventorsDate
6820649 Ball fuel valve with concentrically oriented feed points 2004-11-23
5906224 Reserve fuel valve and method for making Donald Koengeter 1999-05-25
5307770 Priming pump valve Stephen D. Davis 1994-05-03
5256040 Priming pump valve Stephen D. Davis 1993-10-26
5115837 Ball fuel valve with reserve position 1992-05-26
5071325 Combination primer and mixture enrichment device Donald Koengeter 1991-12-10