Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6559340 | Process for preparing N-substituted hydroxylamines and salts thereof | Michael Dockner, Bernd-Michael Konig, Helmut Holzem | 2003-05-06 |
| 6441254 | Process for preparing trimethylol compounds and formic acid | Frank Dobert, Paul Wagner, Alexander Klausener, Rolf Feller | 2002-08-27 |
| 6271415 | S-(4-biphenyl)-thiosulphuric acids and their salts, method for producing the same and method for producing 4-mercaptobiphenyls | Friedrich-Wilhelm Ullrich, Helmut Fiege | 2001-08-07 |
| 6133480 | Preparation of N-phenyl-1-naphthylamine | Horst Behre, Helmut Fiege, Frank Arndt, Rudolf Wiemers, Alexander Klausener | 2000-10-17 |
| 6093852 | Process for preparing 4,6-diamino-resorcinol dihydrochloride | Horst Behre, Helmut Fiege, Heinz U. Blank | 2000-07-25 |
| 5672708 | Process for the preparation of N-arylaminoacrylic acid derivatives and the use of N-arylaminoacrylic acid derivatives thus prepared for the preparation of 4-quinolone-3-carboxylic acid derivatives | Gunter Rauchschwalbe, Bernhard Beitzke, Helmut Fiege | 1997-09-30 |
| 5659088 | Process for the preparation of 4-fluorothiophenol | Helmut Fiege, Ferdinand Hagedorn, Otto Neuner, Herbert Muller | 1997-08-19 |
| 5574188 | Process for the preparation of 4,6-diaminoresorcinol | Horst Behre, Helmut Fiege, Heinz U. Blank, Uwe Heinz | 1996-11-12 |