Issued Patents All Time
Showing 26–50 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5364972 | Preparation of nitrobenzophenones, and a color-stable modification of a benzophenone-azopyridone dye | Helmut Degen, Norbert Zimmerman, Ralf Brueckmann, Arno Lange, Helmut Reichelt | 1994-11-15 |
| 5330543 | Thiopheneazo dyes with a coupling component of the diaminopyridine series | Guenter Hansen, Hermann Loeffler, Helmut Reichelt, Helmut Degen, Arno Lange +1 more | 1994-07-19 |
| 5216139 | Thiopheneazo dye based on a coupling component of the thiazole series | Karl-Heinz Etzbach, Guenter Hansen, Helmut Reichelt | 1993-06-01 |
| 5204312 | Azo dyes for thermal transfer printing | Ruediger Sens, Karl-Heinz Etzbach | 1993-04-20 |
| 5200386 | Azo dyes for thermotransfer printing | Ruediger Sens, Helmut Reichelt, Sabine Gruettner, Karl-Heinz Etzbach | 1993-04-06 |
| 5158928 | Azo dyes for thermotransfer printing | Volker Bach, Karl-Heinz Etzbach, Sabine Gruettner, Helmut Reichelt, Ruediger Sens | 1992-10-27 |
| 5153356 | Aminobenzophenonesulfonic acids | Friedhelm Teich | 1992-10-06 |
| 5151506 | Phenoneazo dyes | Volker Bach, Guenter Hansen, Ruediger Sens | 1992-09-29 |
| 5147845 | Triazolopyridine dyes and thermal transfer of methine dyes | Ruediger Sens, Ernst Schefczik, Karl-Heinz Etzbach, Helmut Reichelt, Matthias Wiesenfeldt | 1992-09-15 |
| 5132412 | Thiazoleazo dyes having a diazo component from the isothiazole or thiadiazole series | Guenter Hansen, Helmut Reichelt, Ernst Schefczik | 1992-07-21 |
| 5112362 | Navy dye mixtures of azo disperse dyes for polyester | Erwin Hahn, Guenter Hansen, Helmut Reichelt, Gerhard Wagenblast | 1992-05-12 |
| 5101035 | Merocyanine-like thiazole dyes and thermal transfer thereof | Volker Bach, Karl-Heinz Etzbach, Ruediger Sens, Klaus Unterforsthuber, Rosemarie Rausch-Krebs | 1992-03-31 |
| 5093308 | Oxadiazolyl-benzene azo hydroxy-pyridone dyes for thermal transfer printing a yellow print | Ruediger Sens, Karl-Heinz Etzbach | 1992-03-03 |
| 5079365 | Triazolopyridine dyes and thermal transfer of methine dyes | Rudiger Sens, Ernst Schefczik, Karl-Heinz Etzbach, Helmut Reichelt, Matthias Wiesenfeldt | 1992-01-07 |
| 5066791 | Pyridoneazo dyes with an M-aminobenzoic ester as the diazo component | Guenter Hansen, Hermann Loeffler | 1991-11-19 |
| 5059684 | Azo dyes whose diazo and coupling components stem from the thiazole series | Karl-Heinz Etzbach, Matthias Wiesenfeldt, Guenter Hansen, Helmut Reichelt | 1991-10-22 |
| 5037798 | Transfer of AZO dyes | Karl-Heinz Etzbach, Helmut Reichelt, Ruediger Sens | 1991-08-06 |
| 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, Guenter Hansen, Ernst Schefczik, Helmut Hagen | 1991-02-19 |
| 4965346 | Heterocyclic azo dyes containing cyanothiophene derivatives as diazo components and diaminopyridines as coupling components | Johannes Dehnert, Hermann Loeffler | 1990-10-23 |
| 4960873 | 3-pyridylisothiazoleazo compounds useful as disperse dyes | Guenter Hansen, Helmut Reichelt, Ernst Schefczik | 1990-10-02 |
| 4939118 | Transfer of azo dyes having a pyridine coupling component | Karl-Heinz Etzbach, Hermann Loeffler, Helmut Reichelt, Ruediger Sens | 1990-07-03 |
| 4855412 | Diaminopyridine azo dyes having acyloxy radicals substituted on the diaminopyridine | Johannes Dehnert, Hermann Loeffler | 1989-08-08 |
| 4855413 | Heterocyclic azo dyes containing cyanothiophene derivatives as diazo components and diaminopyridines as coupling components | Johannes Dehnert, Hermann Loeffler | 1989-08-08 |
| 4652633 | Sulfo-containing halophenylazodiamino, cyano pyridine compounds | — | 1987-03-24 |
| 4650860 | Benzisothiazolazo, diaminopyridine dyes | Johannes Dehnert | 1987-03-17 |