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

Daniel John Janitor

Shell Oil Compny: 2 patents #1,477 of 4,423Top 35%
Houston, TX: #8,651 of 21,073 inventorsTop 45%
Texas: #52,441 of 125,132 inventorsTop 45%
Overall (All Time): #2,223,256 of 4,157,543Top 55%
2 Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
6191310 Diaminoalkane syntheses via selective amination of dihydric alcohols John Frederik Knifton 2001-02-20
6147261 Diaminoalkane syntheses via selective amination of hydroxyaldehydes John Frederik Knifton 2000-11-14