Inventor
WENKE GOTTFRIED
US28 patents
⚠️ This page may combine multiple inventors who share the name “WENKE GOTTFRIED”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CLAIROL INC
19 patentsUS5100436AMar 31, 1992
Oxidative hair dyeing process with catalytic pretreatment
CLAIROL INC45 citations96
US5628799AMay 13, 1997
Hair dying methods and kits which contain a dopa species, reactive direct dye, and a ferricyanide oxidant
CLAIROL INC23 citations92
US5474578ADec 12, 1995
Erasable hair dyeing process
CLAIROL INC58 citations92
US5316551AMay 31, 1994
Oxidative hair dyeing process with catalytic pretreatment
CLAIROL INC28 citations92
US5273550ADec 28, 1993
Process and kit for dyeing hair
CLAIROL INC26 citations92
US5034014AJul 23, 1991
Hair dye composition and method
CLAIROL INC33 citations92
US5704949AJan 6, 1998
Process for the manufacture of a hair dye product containing 5,6-dihydroxyindole
CLAIROL INC30 citations91
US5279618AJan 18, 1994
Process and kit for dyeing hair
CLAIROL INC26 citations91
US5368610ANov 29, 1994
Use of metal salts and chelates together with chlorites as oxidants in hair coloring
CLAIROL INC29 citations89
US5686084ANov 11, 1997
Synthesis of quaternary melanin compounds and their use as hair dyes or for skin treatment
CLAIROL INC16 citations82
US5413612AMay 9, 1995
Composition and method for dyeing hair with indolic compounds in the presence of a chlorite oxidant
CLAIROL INC10 citations74
US5702712ADec 30, 1997
Melanoquaternary compounds and their use as hair dyes and for skin treatment
CLAIROL INC12 citations73
US5441542AAug 15, 1995
Process and kit for post-oxidative treatment of permanently dyed hair
CLAIROL INC18 citations73
US5279617AJan 18, 1994
Process and kit for dyeing hair
CLAIROL INC9 citations72
US5603734AFeb 18, 1997
Hair dyeing with persulfate oxidants and catechols
CLAIROL INC14 citations71
US5374288ADec 20, 1994
Oxidative hair dyeing method, composition, and kit utilizing hydroxyl substituted benzothiazines
CLAIROL INC9 citations71
US5486619AJan 23, 1996
Method of producing DAI from DOPA, using one reaction vessel
CLAIROL INC3 citations62
US5584889ADec 17, 1996
Oxidative hair dyeing process with dihydroxybenzenes and aminoethanethiols
CLAIROL INC5 citations60
US5435810AJul 25, 1995
Hair dyeing process with aminoalkylthio substituted dihydroxybenzene and oxidative agents
CLAIROL INC2 citations60
BRISTOL MYERS SQUIBB CO
7 patentsUS5961991AOct 5, 1999
Melanoquaternary compounds and their use as hair dyes and for skin treatment
BRISTOL MYERS SQUIBB CO10 citations73
US5827330AOct 27, 1998
Synthesis of quarternary melanin compounds and their use as hair dyes or for skin treatment
BRISTOL MYERS SQUIBB CO8 citations73
US5792220AAug 11, 1998
Dyeing hair with melanin procursors in the presence of iodate and peroxide
BRISTOL MYERS SQUIBB CO11 citations73
US6379399B1Apr 30, 2002
Oxidation hair dyeing systems and process for providing more equalized coloration on new and old growth hair
BRISTOL MYERS SQUIBB CO9 citations72
US5980586ANov 9, 1999
Oxidative hair dyeing process with dihydroxybenzenes and aminoethanethiols
BRISTOL MYERS SQUIBB CO8 citations71
US6313313B1Nov 6, 2001
Synthesis of melanoquaternary compounds and their use as hair dyes and for skin treatment
BRISTOL MYERS SQUIBB CO0 citations52
US6160127ADec 12, 2000
Process for the preparation of substituted indoles
BRISTOL MYERS SQUIBB CO0 citations52