Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6822095 | Method for producing 4,6-dichloropyrimidine | Franz-Josef Mais, Alexander Klausener, Guido Steffan | 2004-11-23 |
| 6562970 | Method for producing 4-chloro-6-hydroxypyrimidine | Franz-Josef Mais, Alexander Klausener, Guido Steffan | 2003-05-13 |
| 6525198 | Method for producing 4,6-dichloropyrimidine with sulfur compounds and phosphorus compounds | Franz-Josef Mais, Alexander Klausener, Guido Steffan | 2003-02-25 |
| 6441170 | Method of producing 4,6-dichloropyrimidine with acid chlorides | Franz-Josef Mais, Alexander Klausener, Guido Steffan | 2002-08-27 |
| 6441171 | Method for the production of 4,6-dichloropyrimidine with the aid of phosgene | Franz-Josef Mais, Alexander Klausener, Guido Steffan | 2002-08-27 |
| 5677453 | Process for the preparation of 4,6-dichloropyrimidines | Volker Kass, Guido Steffan | 1997-10-14 |
| 5283338 | Process for the preparation of 2-chloropyridines | Hans Lindel, Guido Steffan | 1994-02-01 |
| 4673729 | Paper auxiliary from condensation product of aliphatic polyol-ether-amine and compound polyfunctional toward amino groups | Wolf-Dieter Schroer, Janos Muszik, Otto Benn | 1987-06-16 |
| 4384110 | Polyamines containing urea groups prepared from lactam or aminocarboxylic acid | Wilfried Lobach, Gunter Kolb, Wolfgang Lehmann, Friedhelm Muller, Janos Muszik | 1983-05-17 |
| 4348514 | Polyamines containing urea groups | Wilfried Lobach, Gunter Kolb, Wolfgang Lehmann, Friedhelm Muller, Janos Muszik | 1982-09-07 |
| 4294985 | Production of thiocarbohydrazide on a commercial scale | Karl H. Blocher | 1981-10-13 |
| 4250298 | Polyamines containing amide groups | Wolfgang Lehmann, Friedhelm Muller, Wilfried Lobach, Knut Hammerstrom | 1981-02-10 |
| 4250299 | Polyamines containing amide groups | Wolfgang Lehmann, Friedhelm Muller, Knut Hammerstrom, Wilfried Lobach | 1981-02-10 |