Erwin Hahn
51Patents
9h-index
87Co-inventors
77Inventor score
Filing activity: Jul 17, 1978 → Jan 10, 1995
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5076808A | Dyeing of polyamide substrates with an organic N-nitroso-hydroxylamine as light stabilizer | Emerging Cross-Sectional Technologies | 56 | Expired |
| US5470502A | Fluorescent pigments | Chemistry; Metallurgy | 54 | Expired |
| US4286959A | Disperse dye formulations | Textiles; Paper | 15 | Expired |
| US5306815A | Azo dyes with a coupling component of the quinoline series | Chemistry; Metallurgy | 15 | Expired |
| US4846892A | Tetrachloroperylene-3,4,9,10-tetracarboxylic acid diimide pigment and its use | Chemistry; Metallurgy | 13 | Expired |
| US5410053A | Rhodamine derivatives | Physics | 13 | Expired |
| US5382476A | Recycling of cured aminoplast resins | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4670591A | Preparation of N-.alpha.-alkoxyethylformamides | Chemistry; Metallurgy | 10 | Expired |
| US4668775A | .alpha.-methine substituted thiophene monoazo dye | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4885396A | Process for the preparation of 2-hydroxy-4-(2'-hydroxyethoxy) benzophenones | Chemistry; Metallurgy | 7 | Expired |
| US4908041A | Navy and black dye mixtures: thiophene azo disperse dye and red, yellow or orange disperse dye | Emerging Cross-Sectional Technologies | 6 | Expired |
| US5560961A | Process of making metal-coated melamine/formaldehyde resin fibers | Textiles; Paper | 6 | Expired |
| US5154763A | Stabilized aqueous alkyldiketene emulsions | Textiles; Paper | 6 | Expired |
| US5131981A | Coloring paper | Textiles; Paper | 6 | Expired |
| US4751288A | Azo dyes containing 2-amino-3-cyano-5-formylthiophene derivatives as diazo components and substituted aniline compounds as coupling components | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5112362A | Navy dye mixtures of azo disperse dyes for polyester | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5286401A | Use of heterocyclic compounds as bleach activators or optical brighteners in washing and cleaning agents | Chemistry; Metallurgy | 5 | Expired |
| US4393005A | Cationic phthalocyanine dyes | Chemistry; Metallurgy | 5 | Expired |
| US4764599A | Disazo compounds containing an N,N-bis(2-amino-benzoyl)piperazine derivative as the diazo component | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5356938A | Recycling of cured aminoplast resins | Emerging Cross-Sectional Technologies | 4 | Expired |
| US5051504A | Doubled triphenylmethane dyes having bis acylpiperazine linkage | Chemistry; Metallurgy | 4 | Expired |
| US4694075A | Bisazo compounds containing anthranilic acid and thiazole moieties | Chemistry; Metallurgy | 4 | Expired |
| US5270456A | Azo dyes with A2-aminothiophene dye azo component and a coupling component and coupling component of the diphenylamine series | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4970321A | Preparation of cyclic N,N'-dimethylureas | Chemistry; Metallurgy | 3 | Expired |
| US5062861A | Novel navy and black disperse dye mixtures including amino-phenyl thiophene azo disperse dye and red, yellow or orange disperse dyes | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.