DL

David G. Leppard

CI Ciba-Geigy: 52 patents #19 of 2,867Top 1%
CC Ciba Specialty Chemicals: 22 patents #29 of 1,233Top 3%
CA Ciba-Geigy A.G.: 2 patents #1 of 21Top 5%
📍 Marly, CH: #1 of 75 inventorsTop 2%
Overall (All Time): #25,151 of 4,157,543Top 1%
76
Patents All Time

Issued Patents All Time

Showing 76–76 of 76 patents

Patent #TitleCo-InventorsDate
4229577 Yellow photographic color couplers containing 3-imino-1,3,4-thiadiazolyl-4 groups Graham Evans, Mario Fryberg, Thomas Stauner, Paul Tschopp 1980-10-21