Inventor

PAN YUH-GUO

US62 patents

⚠️ This page may combine multiple inventors who share the name “PAN YUH-GUO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

PAN YUH-GUO

CLAIROL INC

Direct dyes having a quaternary center with a long aliphatic chain

Quarternized monoalkylenediamine nitrobenzene compounds and their use as dyes for keratinaceous fibers

Direct dyes having a quaternary center with a long aliphatic chain

Quaternized monoalkylenediamine nitrobenzene compounds and their use as dyes for keratinaceous fibers

Hair dye compositions and methods utilizing 2-substituted-1-naphthol couplers

Processes for coloring and/or conditioning hair

Primary intermediates for oxidative coloration of hair

Primary intermediates for oxidative coloration of hair

Aminoan thraquinone dyes having a quaternary center with a long aliphatic chain

Nitrophenylenediamine dyes having a quaternary center with a long aliphatic chain

Direct dyes having a quaternary center with a long aliphatic chain

Storage stable 2-methyl-1-naphthol couplers

Storage stable 2-methyl-1-naphthol couplers

Hair dye coupler compounds

Coupler for use in oxidative hair dyeing

Coupler for use in oxidative hair dyeing

Method of producing DAI from DOPA, using one reaction vessel

Coupler for use in oxidative hair dyeing

Dye couplers

Organic synthesis

PROCTER & GAMBLE

Primary intermediates for oxidative coloration of hair

Hair coloring compositions for use in oxidative hair dyeing

Primary intermediates for oxidative coloration of hair

Couplers for use in oxidative hair dyeing

Primary intermediates for oxidative coloration of hair

Primary intermediates for oxidative coloration of hair

Primary intermediates for oxidative coloration of hair

Couplers for use in oxidative hair dyeing

Coupler for use in oxidative hair dyeing

Couplers for use in oxidative hair dyeing

Primary intermediates for oxidative coloration of hair

Primary intermediates for oxidative coloration of hair

Coupler for use in oxidative hair dyeing

Couplers for use in oxidative hair dyeing

Primary intermediates for oxidative coloration of hair

Primary intermediates for oxidative coloration of hair

Couplers for use in oxidative hair dyeing

BRISTOL MYERS SQUIBB CO

Oxidative hair dye compositions and methods containing 1-(4-aminophenyl)-2-pyrrolidinemethanols

Hair dyeing with N-(4-aminophenyl) prolineamide, couplers, and oxidizing agents

Primary intermediate for use in oxidative hair dyeing

Hair dyeing compositions containing 2-chloro- and 2,6-dichloro-4-aminophenol and phenylpyrazolones

Substituted p-aminophenol, process of preparation and use in dyeing hair

BIS-(2-4-diaminophenoxy) benzenes and their use as coupling components in oxidative hair coloring compositions and methods

Storage stable 2-methyl-1-naphthol couplers

Primary intermediate in oxidative hair dyeing

Coupler for use in oxidative hair dyeing

Synthesis of 1-acetoxy-2-methylnaphthalene

(unassigned)

Oxidative hair coloring composition and process for dyeing human keratinous fibers

Hair dye compositions containing 3-substituted-4-aminophenols and 2-substituted-1-naphthols

BRISTOL MYERS SQUIBB

Hair dye compositions containing 2,3 dialkyl-4-aminophenol and a 2-alkyl-1-naphthol