Inventor
LENOIR JOHN
16 patents
⚠️ This page may combine multiple inventors who share the name “LENOIR JOHN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CIBA GEIGY AG
15 patentsUS4118232AOct 3, 1978
Photographic material containing sulphonic acid group containing disazo dyestuffs
CIBA GEIGY AG42 citations90
US4051123ASep 27, 1977
Sulfonic-acid-group containing disazo dyestuffs
CIBA GEIGY AG29 citations80
US4254215AMar 3, 1981
Process for the prevention of darkening and the formation of a sediment in photographic developer solutions
CIBA GEIGY AG21 citations79
US4521591AJun 4, 1985
Oil-soluble disazo dyes and their use in color-photographic recording materials for the silver dye bleach process
CIBA GEIGY AG17 citations73
US4379819AApr 12, 1983
Color-photographic recording material for the silver dye bleach process
CIBA GEIGY AG12 citations73
US3961957AJun 8, 1976
Dye bleach preparation for the photographic silver dye bleach process
CIBA GEIGY AG9 citations68
US4456668AJun 26, 1984
Azo dyes containing phosphamic acid diester groups
CIBA GEIGY AG2 citations62
US3957860AMay 18, 1976
Process for the manufacture of nuclear-sulphonated compounds
CIBA GEIGY AG2 citations62
US4323682AApr 6, 1982
Quinoxalines and their use in photographic processes
CIBA GEIGY AG3 citations61
US4202698AMay 13, 1980
Quinoxalines and their use in photographic processes
CIBA GEIGY AG5 citations61
US4145217AMar 20, 1979
Quinoxalines and their use in photographic processes
CIBA GEIGY AG2 citations61
US3931142AJan 6, 1976
Heterocyclic containing disazo compounds
CIBA GEIGY AG4 citations57
US4575482AMar 11, 1986
Photographic silver dye bleach materials containing formyl-substituted azo compounds as image dyes
CIBA GEIGY AG1 citations51
US4409143AOct 11, 1983
Monoazo dyes containing phosphamic acid diester groups
CIBA GEIGY AG0 citations51
US4216320AAug 5, 1980
Quinoxaline bleach catalysts
CIBA GEIGY AG0 citations51