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

Douglas E. Longman

Caterpillar: 2 patents #2,982 of 8,398Top 40%
Naperville, IL: #1,350 of 3,051 inventorsTop 45%
Illinois: #34,584 of 84,256 inventorsTop 45%
Overall (All Time): #2,275,047 of 4,157,543Top 55%
2 Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5697341 Fill metered hydraulically actuated fuel injection system and method of fuel injection Thomas G. Ausman, Frederick A. Camplin, Michael P. Harmon, Lianghe Zuo 1997-12-16
5181494 Hydraulically-actuated electronically-controlled unit injector having stroke-controlled piston and methods of operation Thomas G. Ausman, Alan R. Stockner 1993-01-26