Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6198007 | Process for the preparation of 1-substituted 2,4-dinitrobenzenes | Lars Rodefeld, Alexander Klausener | 2001-03-06 |
| 5998628 | Non-explosive preparations of 1-hydroxybenzotriazole | Helmut Fiege | 1999-12-07 |
| 5872300 | Process for the preparation of 2-amino-6-chlorophenyl-alkylsulfanes, and 2-amino-6-chlorophenyl-isopropylsulfane | Wolfgang Kiel, Helmut Fiege | 1999-02-16 |
| 5756809 | "Process for the preparation of (2RS,3RS)-3-(2'-aminophenylthio)-2-hydroxy-3-(4""-methoxyphenyl)-propioni c acid methyl ester" | Helmut Fiege | 1998-05-26 |
| 5670694 | Process for the preparation of 2,4-dichloro-5-fluorobenzonitrile and 2,6-dichloro-3-fluorobenzonitrile | Helmut Fiege, Reinhard Lantzsch | 1997-09-23 |
| 5659088 | Process for the preparation of 4-fluorothiophenol | Helmut Fiege, Wolfgang Eymann, Otto Neuner, Herbert Muller | 1997-08-19 |
| 5650542 | Process for the preparation of 2-chloro-6-nitrophenyl alkyl sulphides and novel 2-chloro-6-nitrophenyl alkyl sulphides | Helmut Fiege | 1997-07-22 |
| 5591869 | Process for the preparation of methylene compounds and the novel compound 2-(2,4-Dichloro-5-fluorobenzyl)thiophene | Helmut Fiege | 1997-01-07 |
| 5502256 | Process for preparing 2,2'-dinitrodiphenyl disulphide | Helmut Fiege, Robert So/ llner, Rudolf Helm | 1996-03-26 |
| 5463068 | Process for desulphurizing organic mercapto and/or disulphide compounds | Helmut Fiege, Hans-Joachim Traenckner | 1995-10-31 |
| 5382686 | Process for preparing nitrodiphenyl (thio) ethers | Helmut Fiege | 1995-01-17 |
| 4540817 | Process for the preparation of 5-amino-2,4-dimethylacetanilide | Horst Behre, Heinz U. Blank, Alfred Seyberlich | 1985-09-10 |
| 4460788 | Process for preparation of anilines which are m-substituted by chlorine | Karlfried Wedemeyer, Werner Evertz | 1984-07-17 |
| 4429156 | Process for the preparation of m-halogen-substituted anilines | Karlfried Wedemeyer, Werner Evertz | 1984-01-31 |
| 4424360 | Process for the preparation of fused 1,2,3-triazoles | Werner Evertz | 1984-01-03 |
| 4316862 | Process for the preparation of sulphonic acid chlorides | Wolfgang Schenk, Heinz U. Blank, Werner Evertz | 1982-02-23 |