Issued Patents All Time
Showing 1–25 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6891060 | Preparation of 3-acyloxy-2-methylbenzoic acids | Johannes Scherer, Friedrich Muller-Hauck | 2005-05-10 |
| 6620962 | Method for producing n-butyryl-4-amino-3-methyl-methyl benzoate and the novel compound n-(4-bromine-2-methylphenyl)-butanamide | Lars Rodefeld, Thomas Hopfner, Alexander Klausener | 2003-09-16 |
| 6610893 | Method for producing 4-hydroxy-3-nitrobiphenyl | Michael Dockner, Alexander Klausener | 2003-08-26 |
| 6465678 | Method for preparing methyl carbazate | Lars Rodefeld, Alexander Klausener, Robert Sollner | 2002-10-15 |
| 6204413 | Process for the preparation of salts of 1-substituted 2,4-diaminobenzenes | Lars Rodefeld, Alexander Klausener | 2001-03-20 |
| 6133480 | Preparation of N-phenyl-1-naphthylamine | Helmut Fiege, Wolfgang Eymann, Frank Arndt, Rudolf Wiemers, Alexander Klausener | 2000-10-17 |
| 6093852 | Process for preparing 4,6-diamino-resorcinol dihydrochloride | Helmut Fiege, Heinz U. Blank, Wolfgang Eymann | 2000-07-25 |
| 5847234 | Process for the preparation of 4-hydroxybiphenyl | Helmut Fiege, Gunter Rauchschwalbe | 1998-12-08 |
| 5847217 | Process for the preparation of 2-amino-5-alkyl-phenols | Guido Steffan | 1998-12-08 |
| 5629441 | 2-(arylimino-methyl)-3-dialkylaminoacrylonitriles, a process for their preparation and their use | Helmut Kraus, Helmut Fiege | 1997-05-13 |
| 5574188 | Process for the preparation of 4,6-diaminoresorcinol | Helmut Fiege, Heinz U. Blank, Uwe Heinz, Wolfgang Eymann | 1996-11-12 |
| 5248812 | Process for the isolation of 2-naphthylamine-1,5-disulphonic acid | Heinz U. Blank, Holger Heidenreich, Fritz Pohl, Paul Uhrhan | 1993-09-28 |
| 4973758 | Process for the preparation of 1,5-dihydroxynaphthalene and 1,5-diaminonaphthalene | Lothar Jakob, Heinz U. Blank, Dietmar Mayer, Roland Busse | 1990-11-27 |
| 4873026 | Process for the preparation of 1-aminonaphthalene-2,4,7-trisulphonic acid and 1-aminonaphthalene-7-sulphonic acid | Heinz U. Blank, Gerhard Marzolph, Willi Streicher | 1989-10-10 |
| 4859372 | Process for the sulphonation of aromatic compounds with sulphur trioxide | Heinz U. Blnak, Wilfried Kohler, Nikolaus Muller, Peter Schnegg | 1989-08-22 |
| 4836959 | Process for the preparation of 1-aminonaphthalene-2,4,7-trisulphonic acid and 1-aminonaphthalene-7-sulphonic acid | Willi Streicher, Gerhard Marzolph, Heinz U. Blank | 1989-06-06 |
| 4705652 | Tetra-alkali metal salts of chromotropic acid, a process for their isolation and their use | Erich Hammerschmidt, Heinz U. Blank, Dietmar Mayer | 1987-11-10 |
| 4609503 | Process for the preparation of 1-amino-8-naphthol-4,6-disulphonic acid (k-acid) | Heinz U. Blank, Willi Schossler | 1986-09-02 |
| 4540817 | Process for the preparation of 5-amino-2,4-dimethylacetanilide | Heinz U. Blank, Alfred Seyberlich, Ferdinand Hagedorn | 1985-09-10 |
| 4538007 | Process for the simultaneous recovery of 4-hydroxy-diphenyl and 4,4'-dihydroxydiphenyl | Eike Gabel, Heinz U. Blank | 1985-08-27 |
| 4534905 | Process for the preparation of nitronaphthalene-sulphonic acids | Heinz U. Blank, Gerhard Burmeister, Otto Lindner | 1985-08-13 |
| 4450297 | Preparation of o-nitrobenzaldehyde | Michael Preiss, Wolfgang Gau | 1984-05-22 |
| 4427601 | Process for preparing 1-amino-2-naphthol-4-sulphonic acid (amidol acid) | Erich Hammerschmidt, Heinz U. Blank, Otto Lindner | 1984-01-24 |
| 4426334 | Process for isolating H acid and K acid | Heinz U. Blank, Otto Lindner, Willi Schossler | 1984-01-17 |
| 4426333 | Process for the preparation of 1-benzoylamino-8-hydroxynaphthalene-4,6-disulphonic acid (benzoyl-K acid) | Erich Hammerschmidt, Bruno Kruger, Adolf Winkler | 1984-01-17 |