Issued Patents All Time
Showing 26–50 of 54 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5354904 | Sulfonamides derived from 1-hydroxy-6-aminonaphthalene-3-sulfonic acid (J acid) | Ulrike Schloesser | 1994-10-11 |
| 5347022 | Preparation of DI- or triarylmethane dyes by oxidation | Thomas Gessner | 1994-09-13 |
| 5338639 | Electrostatic toner containing a keto compound as a charge stabilizer | Gunter-Rudolf Schroeder | 1994-08-16 |
| 5286854 | Basic azo dyes with a coupling component of the hydroxynaphthalenecarboxylic acid series | Erwin Hahn, Heidi Hengelsberg | 1994-02-15 |
| 5175260 | Disazo dyes with hydroxysulfonylnaphthalene coupling components | Gunter-Rudolf Schroeder | 1992-12-29 |
| 5144064 | Preparation of J-acid urea | Erwin Hahn, Friedrich-Wilhelm Raulfs, Ulrike Schloesser | 1992-09-01 |
| 5071987 | Quinoline-4-carboxylic acid derivatives | Friedrich-Wilhelm Raulfs | 1991-12-10 |
| 5053524 | 3-aminophenylpentane-1,5-diones | Friedrich-Wilhelm Raulfs, Andreas Oberlinner | 1991-10-01 |
| 5051504 | Doubled triphenylmethane dyes having bis acylpiperazine linkage | Erwin Hahn, Walter Breitschaft, Gunter-Rudolf Schroeder | 1991-09-24 |
| 5019165 | Recording fluid for the ink jet process | Horst Bruder | 1991-05-28 |
| 5015292 | Recording fluid for the ink jet process | Horst Bruder, Rainer Dyllick-Brenzinger, Steven J. Bares | 1991-05-14 |
| 4975118 | Recording fluid containing phenyl azo naphthalene dyes for the ink jet process | Rainer Dyllick-Brenzinger, Horst Bruder, Steven J. Bares | 1990-12-04 |
| 4966983 | Benzopyrans for use in recording systems | Andreas Guentner, Andreas Oberlinner | 1990-10-30 |
| 4962190 | Azo dyes containing polyethyleneimine with an aniline diazo component and a hydroxynaphthalene, aminopyridine or acetoacetic coupling component | Friedrich-Wilhelm Raulfs | 1990-10-09 |
| 4958021 | Benzopyran derivatives | Andreas Guentner, Andreas Oberlinner | 1990-09-18 |
| 4935059 | Basic rhodamine dyes | Andreas Oberlinner | 1990-06-19 |
| 4912006 | Electrostatic toner | Walter Breitschaft, Erwin Czech, Guenther Seybold, Horst Bruder, Rainer Dyllick-Brenzinger | 1990-03-27 |
| 4908447 | 2-,6-diphenylpyridine compounds useful as dye precursors | Friedrich-Wilhelm Raulfs | 1990-03-13 |
| 4904798 | (4-amino-2-hydroxyphenyl-1-oxoisoindolenines, preparation thereof and hydrolysis thereof to 2-(4-amino-2-hydroxybenzoyl)benzoic acids | Joachim Kranz, Bernd Landmann | 1990-02-27 |
| 4880769 | Transfer of catinic dyes in their deprotonated, electrically neutral form | Johannes P. Dix, Karl-Heinz Etzbach, Ruediger Sens | 1989-11-14 |
| 4841050 | Carbazole containing benzopyrans | Andreas Guentner, Andreas Oberlinner | 1989-06-20 |
| 4828718 | Catalytic degradation of oxidizable organic and inorganic compounds in waters | Wolfgang Habermann, Hubert Engelhardt, Wolfgang Geiger, Peter Hammes, Werner Simmler | 1989-05-09 |
| 4784668 | Novel heterocycle-containing trisazo dyes | Walter Breitschaft, Guenther Seybold | 1988-11-15 |
| 4717423 | Mixtures of dye precursors, and pressure-sensitive recording material containing these mixtures | Rainer Dyllick-Brenzinger, Andreas Oberlinner | 1988-01-05 |
| 4648993 | Cationic phthalocyanine dyes | Horst Colberg | 1987-03-10 |