Issued Patents All Time
Showing 25 most recent of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5206375 | Thiophene derivatives | Ernst Schefczik, Karl-Heinz Etzbach | 1993-04-27 |
| 5145952 | Thiopheneazo dyes with a coupling component based on M-phenylenediamine | Karl-Heinz Etzbach, Guenter Hansen, Helmut Reichelt, Ernst Schefczik | 1992-09-08 |
| 5082973 | Process for the preparation of bis(4-chlorophenyl) sulfone | Michael Stumpp, Peter Neumann | 1992-01-21 |
| 5072034 | Preparation of 4-alkoxy-2-hydroxybenzophenone-5-sulfonic acids | Peter Neumann, Alexander Aumueller | 1991-12-10 |
| 5006659 | Preparation of 7-chloroquinoline-8-carboxylic acids | Helmut Hagen, Jacques Dupuis | 1991-04-09 |
| 4983773 | Preparation of bis-(4-chlorophenyl) sulfone | Michael Stumpp, Peter Neumann | 1991-01-08 |
| 4897469 | Aniline series azo reactive dyes ortho- or para-substituted by vinyl sulfonyl reactive groups | Ruediger Iden | 1990-01-30 |
| 4873372 | Isolation of 4,4'-dichlorodiphenyl sulfone | Gerhard Schaefer, Peter Neumann, Michael Stumpp | 1989-10-10 |
| 4843153 | Azo dyes containing thienothiophene radicals as radicals of the diazo component | Karl-Heinz Etzbach, Guenter Hansen, Helmut Reichelt | 1989-06-27 |
| 4785116 | Aminoisothiazole compounds | Karl-Heinz Etzbach | 1988-11-15 |
| 4677199 | Reactive dyes containing substituted 4-fluoropyridaz-6-one radicals | Dietmar Augart, Heinz-Wolfgang Krueger, Hartmut Lardon, Ortwin Schaffer, Guenther Seybold | 1987-06-30 |
| 4533612 | Electrophotographic recording materials containing special charge carrier-transporting compounds | Karl-Heinz Etzbach, Gerhard Hoffmann, Peter Neumann | 1985-08-06 |
| 4490541 | 5(3)-Aminopyrazolo-3,4(4,5)-dicarboximide azo dyestuff intermediates | Karl-Heinz Etzbach | 1984-12-25 |
| 4483795 | Substituted phenyl disazo dyes containing a 2-amino-substituted thiazole radical | Guenter Hansen, Guenther Seybold, Georg Zeidler | 1984-11-20 |
| 4481272 | Layered electrophotographic recording medium comprising heterocyclic nitrogen containing organic dye compounds | Albrecht Eckell, Albert Elzer, Franz Feichtmayr, Gerhard Hoffmann, Reinhold J. Leyrer +1 more | 1984-11-06 |
| 4466899 | Dyes for use in liquid crystal mixtures | Walter Ditter, Karl-Heinz Etzbach, Dieter Horn, Manfred Patsch | 1984-08-21 |
| 4465857 | Phenylhydrazones | Peter Neumann, Karl-Heinz Etzbach, Gerhard Hoffmann | 1984-08-14 |
| 4456672 | Electrophotographic recording materials containing triazole charge carrier-transporting compounds | Karl-Heinz Etzbach, Gerhard Hoffmann, Peter Neumann | 1984-06-26 |
| 4407810 | Thiazol-2-yl-oxamic acid derivatives, and therapeutic agents containing these compounds | Peter Neumann, Guenther Seybold, Dieter Lenke, Ludwig Friedrich | 1983-10-04 |
| 4372885 | Bisazo dyes containing a 2-amino-substituted thiazole radical | Guenter Hansen, Guenther Seybold, Georg Zeidler | 1983-02-08 |
| 4340537 | Monoazo dyes of the thiazole series having a heterocyclic substituent in the 4-position | Guenter Hansen, Guenther Seybold | 1982-07-20 |
| 4327019 | Acid azo dyes from a 3-amino-benzisothiazole-[2,1]-5-sulfonic acid diazo component | Guenter Hansen, Guenther Seybold, Georg Zeidler | 1982-04-27 |
| 4278606 | Preparation of 1-amino-2-phenoxy-4-hydroxyanthraquinone | Heinrich Hiller, Helmut Reinicke, Fritz Traub | 1981-07-14 |
| 4250090 | 2-Amino-5-arylazoarylazothiazole compounds | Guenter Hansen, Guenther Seybold, Georg Zeidler | 1981-02-10 |
| 4239894 | Thiazole derivatives | Guenther Seybold | 1980-12-16 |