Issued Patents All Time
Showing 26–42 of 42 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4960874 | Isothiazolylazo dyes having aminophenyl and aminonaphthyl components | Udo Bergmann, Johannes D. Dix, Guenter Hansen, Guenther Seybold | 1990-10-02 |
| 4960873 | 3-pyridylisothiazoleazo compounds useful as disperse dyes | Guenter Hansen, Gunther Lamm, Helmut Reichelt | 1990-10-02 |
| 4939012 | Naphtholactam dyes and optical recording medium containing these dyes | Matthias Dust, Peter Neumann, Heidi Benthack-Thoms, Helmut Barzynski, Klaus D. Schomann +2 more | 1990-07-03 |
| 4929720 | Isothiazoleazo hydroxypyridone dyes | Guenter Hansen, Helmut Reichelt | 1990-05-29 |
| 4908041 | Navy and black dye mixtures: thiophene azo disperse dye and red, yellow or orange disperse dye | Erwin Hahn, Guenter Hansen, Karl-Heinz Etzbach, Helmut Reichelt, Helmut Degen +2 more | 1990-03-13 |
| 4904777 | Mono azo dyes containing as diazo radical a thiophene radical which possesses an oxime group | Karl-Heinz Etzbach, Guenter Hansen, Helmut Reichelt | 1990-02-27 |
| 4876356 | Naphtholactam dyes and optical recording medium containing these days | Matthias Dust, Peter Neumann, Heidi Benthack-Thoms, Helmut Barzynski, Klaus D. Schomann +2 more | 1989-10-24 |
| 4837269 | 2-aminothiophene radical substituted by an electron withdrawing group | Karl-Heinz Etzbach, Guenter Hansen, Helmut Reichelt | 1989-06-06 |
| 4774324 | Isothiazolylazo dyes | Hermann Loeffler | 1988-09-27 |
| 4764600 | Isothiazolylazo dyes having aminophenyl and aminonaphthyl components | Udo Bergmann, Johannes P. Dix, Guenter Hansen, Guenther Seybold | 1988-08-16 |
| 4667051 | Preparation of cyano-substituted enol ethers | — | 1987-05-19 |
| 4619992 | 3-(.beta.-aminoethyl)-4-cyano-isothiazolylazo dyes | Udo Bergmann, Johannes P. Dix, Guenter Hansen | 1986-10-28 |
| 4611064 | Preparation of indole derivatives | — | 1986-09-09 |
| 4525591 | 2,4-Dioxotetrahydropyrimido-(1,2-a)-benzimidazole substituted isoindoline dyes and their use | Wolfgang Lotsch, Reinhard Kemper | 1985-06-25 |
| 4496480 | Isothiazolazo dyes having coupling components which are free from unsaturated aliphatic radicals | Udo Bergmann, Johannes P. Dix, Guenter Hansen | 1985-01-29 |
| 4352932 | Isoindoline colorants | Wolfgang Lotsch, Reinhard Kemper | 1982-10-05 |
| 4315855 | Monoazo disperse dyes containing a nitrophenyl group and a homophthalimide group | — | 1982-02-16 |