Inventor
SEIDEL WINFRIED
DE6 patents
⚠️ This page may combine multiple inventors who share the name “SEIDEL WINFRIED”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SCHWARZKOPF GMBH HANS
5 patentsUS5230710AJul 27, 1993
Substituted 2,6-diaminotoluenes, processes for their preparation and coloring agents for keratinic fibers comprising these compounds
SCHWARZKOPF GMBH HANS19 citations79
US5067967ANov 26, 1991
Nitro-p-phenylenediamine derivatives, processes for their preparation and coloring agents containing these for use on keratin fibres
SCHWARZKOPF GMBH HANS8 citations71
US4575378AMar 11, 1986
Substituted 4-amino-3-nitrophenols, processes for their preparation and hair-coloring agents containing these compounds
SCHWARZKOPF GMBH HANS8 citations65
US5091581AFeb 25, 1992
Process for the selective preparation of n-substituted 1,4-diamino-2-nitrobenzenes
SCHWARZKOPF GMBH HANS3 citations59
US5163970ANov 17, 1992
Nitro-p-phenylenediamine derivatives, processes for their preparation and coloring agents containing these for use on keratin fibres
SCHWARZKOPF GMBH HANS0 citations50