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

Robert B. Champ

IBM: 5 patents #18,733 of 70,183Top 30%
LILexmark International: 2 patents #792 of 1,615Top 50%
Boulder, CO: #993 of 5,018 inventorsTop 20%
Colorado: #6,668 of 40,980 inventorsTop 20%
Overall (All Time): #763,736 of 4,157,543Top 20%
7 Patents All Time

Issued Patents All Time

Showing 1–7 of 7 patents

Patent #TitleCo-InventorsDate
6004708 Electrophotographic photoconductor containing fluorenyl-azine derivatives as charge transport additives Mark Thomas Bellino, Weimei Luo 1999-12-21
5130217 Squarylium photoconductors with noncrystalline bisphenol a binders Donald A. Stremel 1992-07-14
4889784 Organic photoconductors with improved wear Meredith D. Shattuck, Donald A. Stremel 1989-12-26
4677045 Squarylium charge generating dye and electrophotographic photoconductor Robert L. Vollmer 1987-06-30
4490452 Xerographic photoconductors with cross-linked epoxy binder Yau T. Chen 1984-12-25
4362798 Hydrazone and pyrazoline or acetosol yellow containing charge transport layer, photoconductor and electrophotographic process using the same Howard W. Anderson 1982-12-07
4307167 Layered electrophotographic plate having tetramethyl benzidene based disazo dye Larry D. Bowden, Michael Thomas Moore 1981-12-22