Ernst Schefczik
51Patents
9h-index
45Co-inventors
78Inventor score
Filing activity: Jul 24, 1973 → Nov 10, 1997
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4939012A | Naphtholactam dyes and optical recording medium containing these dyes | Emerging Cross-Sectional Technologies | 31 | Expired |
| US5079365A | Triazolopyridine dyes and thermal transfer of methine dyes | Emerging Cross-Sectional Technologies | 27 | Expired |
| US4774324A | Isothiazolylazo dyes | Chemistry; Metallurgy | 15 | Expired |
| US5147845A | Triazolopyridine dyes and thermal transfer of methine dyes | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5283326A | Dyes containing thiophene radicals | Chemistry; Metallurgy | 13 | Expired |
| US4994564A | Azo dyes with a diazo component of the 3-amino thiophene series and a coupling component of the pyridine, pyridone or pyrazole series | Chemistry; Metallurgy | 13 | Expired |
| US6043369A | [1,3,4] Triazolo [1,5-A] pyridines | Chemistry; Metallurgy | 12 | Expired |
| US5538939A | Acylamino-substituted isoxazole or isothiazole derivatives, their preparation and their use | Chemistry; Metallurgy | 11 | Expired |
| US5580980A | N-aminopyridone dyes | Performing Operations; Transporting | 11 | Expired |
| US4619992A | 3-(.beta.-aminoethyl)-4-cyano-isothiazolylazo dyes | Chemistry; Metallurgy | 9 | Expired |
| US4315855A | Monoazo disperse dyes containing a nitrophenyl group and a homophthalimide group | Chemistry; Metallurgy | 8 | Expired |
| US3963747A | Basic arylmercaptonaphtholactam dyes | Chemistry; Metallurgy | 8 | Expired |
| US4764600A | Isothiazolylazo dyes having aminophenyl and aminonaphthyl components | Emerging Cross-Sectional Technologies | 7 | Expired |
| US5608041A | Azo dyestuffs containing a diazo component from the aniline series and coupling component from the triazolopyridine series | Emerging Cross-Sectional Technologies | 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 |
| US4837269A | 2-aminothiophene radical substituted by an electron withdrawing group | Chemistry; Metallurgy | 6 | Expired |
| US4952681A | Dyes containing 3,4-disubstituted-2-diaza-thiophene radicals | General | 6 | Revoked |
| US5206375A | Thiophene derivatives | Chemistry; Metallurgy | 5 | Expired |
| US4496480A | Isothiazolazo dyes having coupling components which are free from unsaturated aliphatic radicals | Chemistry; Metallurgy | 5 | Expired |
| US4876356A | Naphtholactam dyes and optical recording medium containing these days | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5101028A | (1,2,4)triazolo[2,3-a]pyridines | Chemistry; Metallurgy | 5 | Expired |
| US5654122A | N-aminopyridone dyes | Performing Operations; Transporting | 4 | Expired |
| US5352774A | Dyes containing thiophene radicals | Chemistry; Metallurgy | 4 | Expired |
| US4525591A | 2,4-Dioxotetrahydropyrimido-(1,2-a)-benzimidazole substituted isoindoline dyes and their use | Chemistry; Metallurgy | 4 | Expired |
| US4960873A | 3-pyridylisothiazoleazo compounds useful as disperse dyes | Emerging Cross-Sectional Technologies | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.