Alexander Chan
33Patents
11h-index
33Co-inventors
71Inventor score
Filing activity: Aug 26, 1988 → Oct 12, 2004
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6238653A | Liquid crystalline peroxide compositions and methods for coloring and/or bleaching hair | Human Necessities | 49 | Expired |
| US5651960A | Method and composition for removing semi-permanent color from human hair | Human Necessities | 46 | Expired |
| US7041142B2 | Two step hair coloring compositions delivering deeper, long-lasting color | Human Necessities | 38 | Expired |
| US6143286A | Method for improving the fade resistance of hair and related compositions | Human Necessities | 38 | Expired |
| US5474578A | Erasable hair dyeing process | Human Necessities | 25 | Expired |
| US6306182A | Polymeric dye compounds and compositions and methods for coloring hair | Human Necessities | 24 | Expired |
| US4968497A | Skin tanning composition and method | Human Necessities | 21 | Expired |
| US6596035B2 | One step method and compositions for simultaneously coloring and highlighting hair | Human Necessities | 20 | Expired |
| US5344463A | Hair dye compositions and methods utilizing 2-substituted-1-naphthol couplers | Human Necessities | 19 | Expired |
| US5135543A | Quaternized monoalkylenediamine nitrobenzene compounds and their use as dyes for keratinaceous fibers | Human Necessities | 17 | Expired |
| US5368610A | Use of metal salts and chelates together with chlorites as oxidants in hair coloring | Human Necessities | 14 | Expired |
| US6315989A | Water in oil microemulsion peroxide compositions for use in coloring hair and related methods | Human Necessities | 11 | Expired |
| US5169403A | Direct dyes having a quaternary center with a long aliphatic chain | Human Necessities | 11 | Expired |
| US5486629A | Direct dyes having a quaternary center with a long aliphatic chain | Chemistry; Metallurgy | 10 | Expired |
| US5256823A | Quarternized monoalkylenediamine nitrobenzene compounds and their use as dyes for keratinaceous fibers | Human Necessities | 10 | Expired |
| US5540738A | Oxidative hair coloring composition and process for dyeing human keratinous fibers | Human Necessities | 10 | Expired |
| US4975092A | Processes for coloring and/or conditioning hair | Human Necessities | 8 | Expired |
| US5314505A | Aminoan thraquinone dyes having a quaternary center with a long aliphatic chain | Human Necessities | 8 | Expired |
| US5049381A | Skin coloring compositions containing indoles and quaternary ammonium salts | Human Necessities | 6 | Expired |
| US5073173A | Dye couplers | Chemistry; Metallurgy | 6 | Expired |
| US5420362A | Synthesis of 2-methyl-1-naphthol | Chemistry; Metallurgy | 6 | Expired |
| US6743264B2 | Two step permanent coloring of hair | Human Necessities | 6 | Expired |
| US5183941A | Hair dye coupler compounds | Chemistry; Metallurgy | 5 | Expired |
| US5037640A | Skin coloring and sunscreening compositions containing indoles and M-nitro alkoxybenzenes | Human Necessities | 4 | Expired |
| US7066968B2 | Efficient two-step method of coloring and lightening hair with less damage | Human Necessities | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.