Issued Patents All Time
Showing 25 most recent of 62 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5352774 | Dyes containing thiophene radicals | Ernst Schefczik, Karl-Heinz Etzbach, Helmut Reichelt, Hermann Loeffler | 1994-10-04 |
| 5330543 | Thiopheneazo dyes with a coupling component of the diaminopyridine series | Gunther Lamm, Hermann Loeffler, Helmut Reichelt, Helmut Degen, Arno Lange +1 more | 1994-07-19 |
| 5283326 | Dyes containing thiophene radicals | Ernst Schefczik, Karl-Heinz Etzbach, Helmut Reichelt, Hermann Loeffler | 1994-02-01 |
| 5270456 | Azo dyes with A2-aminothiophene dye azo component and a coupling component and coupling component of the diphenylamine series | Erwin Hahn, Karl-Heinz Etzbach, Helmut Reichelt, Ernst Schefczik, Sabine Greuttner +1 more | 1993-12-14 |
| 5264560 | Preparation of quaternized azo dyes | Johannes P. Dix, Helmut Reichelt, Clemens Grund | 1993-11-23 |
| 5247071 | Preparation of acetalized azo dyes | Georg Zeidler | 1993-09-21 |
| 5216139 | Thiopheneazo dye based on a coupling component of the thiazole series | Karl-Heinz Etzbach, Gunther Lamm, Helmut Reichelt | 1993-06-01 |
| 5182372 | Aniline-based oil-soluble azo dyes | Bernd Derber, Helmut Reichelt, Christos Vamvakaris, Georg Zeidler | 1993-01-26 |
| 5175265 | Azo dyes with a diazo component of the 4-amino-7-nitrobenzisothiazole series and a coupling compound from the aminopyrazole or hydroxypyridone series | Helmut Hagen, Helmut Reichelt | 1992-12-29 |
| 5151506 | Phenoneazo dyes | Volker Bach, Gunther Lamm, Ruediger Sens | 1992-09-29 |
| 5145952 | Thiopheneazo dyes with a coupling component based on M-phenylenediamine | Heinz Eilingsfeld, Karl-Heinz Etzbach, Helmut Reichelt, Ernst Schefczik | 1992-09-08 |
| 5132412 | Thiazoleazo dyes having a diazo component from the isothiazole or thiadiazole series | Gunther Lamm, Helmut Reichelt, Ernst Schefczik | 1992-07-21 |
| 5112362 | Navy dye mixtures of azo disperse dyes for polyester | Erwin Hahn, Gunther Lamm, Helmut Reichelt, Gerhard Wagenblast | 1992-05-12 |
| 5104979 | Polyazo dyes with diazo components of the aminophenol and the amino diphenyl-sulfide, -sulfoxide or -sulfone series | Georg Zeidler, Ortwin Schaffer | 1992-04-14 |
| 5073634 | Tetrachloroferrates of basic dyes | Johannes P. Dix, Hellmut Kast | 1991-12-17 |
| 5066791 | Pyridoneazo dyes with an M-aminobenzoic ester as the diazo component | Gunther Lamm, Hermann Loeffler | 1991-11-19 |
| 5062861 | Novel navy and black disperse dye mixtures including amino-phenyl thiophene azo disperse dye and red, yellow or orange disperse dyes | Erwin Hahn, Karl-Heinz Etzbach, Helmut Reichelt, Ernst Schefczik, Helmut Degen +2 more | 1991-11-05 |
| 5059684 | Azo dyes whose diazo and coupling components stem from the thiazole series | Gunther Lamm, Karl-Heinz Etzbach, Matthias Wiesenfeldt, Helmut Reichelt | 1991-10-22 |
| 4994564 | Azo dyes with a diazo component of the 3-amino thiophene series and a coupling component of the pyridine, pyridone or pyrazole series | Karl-Heinz Etzbach, Helmut Reichelt, Ernst Schefczik, Helmut Hagen, Gunther Lamm | 1991-02-19 |
| 4976744 | Preparation of concentrated solutions of cationic dyes as mono-carboxylates in glycol ether | Johannes P. Dix, Hellmut Kast | 1990-12-11 |
| 4960873 | 3-pyridylisothiazoleazo compounds useful as disperse dyes | Gunther Lamm, Helmut Reichelt, Ernst Schefczik | 1990-10-02 |
| 4960874 | Isothiazolylazo dyes having aminophenyl and aminonaphthyl components | Udo Bergmann, Johannes D. Dix, Ernst Schefczik, Guenther Seybold | 1990-10-02 |
| 4948702 | Photosensitive recording element | Guenter Wallbillich, Peter Neumann | 1990-08-14 |
| 4929720 | Isothiazoleazo hydroxypyridone dyes | Ernst Schefczik, Helmut Reichelt | 1990-05-29 |
| 4908437 | Thien-2-one compounds with an alkylidene or imino group in the 5-position of the ring | Johannes P. Dix, Helmut Reichelt, Masahiro Hayashi | 1990-03-13 |