Issued Patents All Time
Showing 1–24 of 24 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5380862 | Preparation of isomer-free 2,5-dichloro-pyridine | Stefan Sendelbach, Wolfgang Weiss, Hans W. Kleffner, Albrecht Laufer | 1995-01-10 |
| 5169990 | Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene | Emmerich Pastorek, Wolfgang Weiss, Hans W. Kleffner | 1992-12-08 |
| 5149886 | Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene | Emmerich Pastorek, Wolfgang Weiss, Hans W. Kleffner | 1992-09-22 |
| 5082944 | Production of pyridine-3-sulfonic acid | Rolf Losch, Wolfgang Weiss, Hans W. Kleffner | 1992-01-21 |
| 5066806 | Novel separation process | Emmerich Pastorek, Wolfgang Weiss, Hans W. Kleffner | 1991-11-19 |
| 4942239 | Process for the production of 2-hydroxypyridine | Michael Gerhard Hassler, Hans W. Kleffner, Wolfgang Weiss | 1990-07-17 |
| 4925942 | Preparation of quinuclidine-3-methanol | Josef Gotz, Wolfgang Weiss, Bernd Rapp, Hans W. Kleffner | 1990-05-15 |
| 4865620 | Hair dye composition | Wolfgang Weiss, Hans W. Kleffner | 1989-09-12 |
| 4785110 | Process for the production of 2-amino-3-nitro-6-(4-fluorobenzylamino)-pyridine | Jurgen Engel, Peter Emig, Gerhard Scheffler, Hans Pohle | 1988-11-15 |
| 4719298 | Side chain chlorination process of heterocycles | Gunter Jeromin, Werner Fickert | 1988-01-12 |
| 4659846 | Preparation of 2,5-diloweralkyl-1.4:3,6-dianhydrosorbitols | Manfred Maurer, Werner Fickert | 1987-04-21 |
| 4582910 | Method for preparation of 4-halogenonaphthalic acid anhydrides | Emmerich Pastorek, Werner Fickert | 1986-04-15 |
| 4567272 | Pyrrole containing 2-aminonitropyridine derivatives | Werner Fickert | 1986-01-28 |
| 4564700 | Process for the preparation of fluorene-9-carboxylic acid | Emmerich Pastorek, Werner Fickert | 1986-01-14 |
| 4549024 | Oxidation of quinoline to quinolinic acid | Emmerich Pastorek, Werner Fickert | 1985-10-22 |
| 4546190 | Method for producing 3,5,6-trichloro-1H-pyridine-2-on | Werner Fickert | 1985-10-08 |
| 4529800 | Novel process for the preparation of 2-halo-3-nitro-6-alkoxy-pyridines | Werner Fickert | 1985-07-16 |
| 4510090 | Method for the production of phenanthrenequinone | Dietrich Tonnius, Wolfgang Weiss, Heinrich Miele, Emmerich Pastorek | 1985-04-09 |
| 4493935 | Preparation of 1H-pyrrol-2-acetic acid esters | Werner Fickert | 1985-01-15 |
| 4377699 | 5-Chloro-indole preparation | Manfred Maurer, Werner Fickert | 1983-03-22 |
| 4357277 | Novel process for the preparation of N,N'-bisacyl hydrazides | Fritz Lange, Werner Fickert | 1982-11-02 |
| 4332728 | Process for the preparation of bisacyl hydrazines | Fritz Lange, Werner Fickert | 1982-06-01 |
| 4256892 | Preparation of bis-2-pyridyl-disulfides | Manfred Maurer, Werner Fickert | 1981-03-17 |
| 4228083 | Process for the production of .beta.-(5-nitro-2-furyl)-acrolein | Emmerich Pastorek, Werner Fickert | 1980-10-14 |