Issued Patents All Time
Showing 26–50 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4908041 | Navy and black dye mixtures: thiophene azo disperse dye and red, yellow or orange disperse dye | Guenter Hansen, Karl-Heinz Etzbach, Helmut Reichelt, Ernst Schefczik, Helmut Degen +2 more | 1990-03-13 |
| 4885396 | Process for the preparation of 2-hydroxy-4-(2'-hydroxyethoxy) benzophenones | Peter Neumann | 1989-12-05 |
| 4861898 | Isoindoline metal complexes | Volker Radtke, Heinrich Kowarsch | 1989-08-29 |
| 4846892 | Tetrachloroperylene-3,4,9,10-tetracarboxylic acid diimide pigment and its use | Georg Henning, Peter Hauser, Manfred Patsch | 1989-07-11 |
| 4820809 | Heterocyclic azo dyes | Udo Bergmann, Guenter Hansen | 1989-04-11 |
| 4764599 | Disazo compounds containing an N,N-bis(2-amino-benzoyl)piperazine derivative as the diazo component | Horst Colberg | 1988-08-16 |
| 4751288 | Azo dyes containing 2-amino-3-cyano-5-formylthiophene derivatives as diazo components and substituted aniline compounds as coupling components | Udo Bergmann, Guenter Hansen, Helmut Reichelt | 1988-06-14 |
| 4751314 | Preparation of tetrachloro-3-iminoisoindolin-1-one | Heinrich Kowarsch | 1988-06-14 |
| 4723023 | Isoindoline dyes | Wolfgang Lotsch, Reinhard Kemper | 1988-02-02 |
| 4694075 | Bisazo compounds containing anthranilic acid and thiazole moieties | Horst Colberg | 1987-09-15 |
| 4670591 | Preparation of N-.alpha.-alkoxyethylformamides | Alfred Oftring, Rolf Fikentscher | 1987-06-02 |
| 4668775 | .alpha.-methine substituted thiophene monoazo dye | Udo Bergmann, Guenter Hansen | 1987-05-26 |
| 4654432 | Preparation of 2-(hydroxymethyl)-acrylonitrile and 2-(hydroxymethyl)-acrylates | Rolf Fikentscher, Alexander Kud, Alfred Oftring | 1987-03-31 |
| 4652669 | 2-(1-hydroxycarbalkoxymethyl)-acrylonitriles and 2-(1-hydroxycarbalkoxymethyl)-acrylates and their preparation | Rolf Fikentscher, Alexander Kud, Alfred Oftring | 1987-03-24 |
| 4629616 | Basic chromium aluminum sulfates and their preparation | Werner Ostertag, Henning Wienand, Dietrich Lach | 1986-12-16 |
| 4512929 | 1-Alkyl-2-isocyanatomethyl-isocyanatobenzenes and/or 1-alkyl-4-isocyanatomethyl-isocyanatobenzenes | Peter Neumann | 1985-04-23 |
| 4491544 | Dyes having a diazo component and an isoquinoline coupling component | Volker Radtke, Heinrich Kowarsch, Peter Hauser | 1985-01-01 |
| 4477381 | Triaminotriarylmethane colorants | Udo Mayer, Joachim Jesse | 1984-10-16 |
| 4393005 | Cationic phthalocyanine dyes | Manfred Patsch, Manfred Ruske | 1983-07-12 |
| 4377387 | Deliming hides | Dietrich Lach, Kurt Schneider, Rainer Strickler, Rolf Streicher | 1983-03-22 |
| 4332955 | Preparation of transparent pigmentary forms of 4,4',7,7'-tetrachlorothioindigo | Helmut Hoch, Heinrich Hiller | 1982-06-01 |
| 4322210 | Auxiliary, and process, for the soaking of hides | Dietrich Lach, Rolf Streicher | 1982-03-30 |
| 4298534 | Preparation of brilliant, transparent pigmentary bromo-isoviolanthrone of high tinctorial strength | Helmut Hoch, Heinrich Hiller | 1981-11-03 |
| 4286959 | Disperse dye formulations | Dieter Horn, Ewald Daubach, Herbert Uhrig, Richard Hoene, Herbert Naarmann | 1981-09-01 |
| 4213760 | Deliming of hides | Bernhard Magerkurth, Dietrich Lach, Lothar Wuertele | 1980-07-22 |