Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6933371 | Bisazo dyestuffs based on hydroxynaphthalene carboxylic acid | Gunter Schroder, Sophia Ebert, Karl-Heinz Etzbach, Rudiger Sens | 2005-08-23 |
| 6903197 | Azoxy dyes and copper complexes thereof | Karl-Heinz Etzbach, Rudiger Sens, Claudia Krah | 2005-06-07 |
| 6846956 | Triarylmethane dyes | Hellmut Kast, Thomas Gessner | 2005-01-25 |
| 6743901 | Preparation of liquid formulations of basic azo dyes | Michael Schmitt, Roland Merger | 2004-06-01 |
| 6727351 | Azoxy dyes and their Cu complexes | Karl-Heinz Etzbach, Rudiger Sens, Claudia Krah | 2004-04-27 |
| 6673206 | Method of producing paper, paperboard and cardboard | Friedrich Linhart, Bernd Dirks, Bernhard Mohr, Dietrich Fehringer | 2004-01-06 |
| 6346609 | Cationic azo-dyes | Karl-Heinz Etzbach, Torsten Freund | 2002-02-12 |
| 6048968 | Cationic azo dyes based on aminobenzoic acid | Karl-Heinz Etzbach, Torsten Freund | 2000-04-11 |
| 6048969 | Cationic sulfonic acid dyes | Gunter Schroder, Udo Mayer | 2000-04-11 |
| 5098521 | Production of paper, board and cardboard from paper stocks containing foreign materials | Enrique Freudenberg, Friedrich Linhart, Heinrich Hartmann, Walter Denzinger, Michael Kroener +1 more | 1992-03-24 |