Issued Patents All Time
Showing 25 most recent of 39 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6645904 | Aminophosphonium compounds | Berthold Schiemenz, Thomas Wessel | 2003-11-11 |
| 6465643 | Aminophosphonium compounds | Berthold Schiemenz, Thomas Wessel | 2002-10-15 |
| 6407029 | Mixtures comprising tetrakis(pyrrolidino/piperdino)phosphonium salts | Berthold Schiemenz, Thomas Wessel, Andreas Beck, Walter Hahn | 2002-06-18 |
| 6362365 | Preparation of trifluorobenzoic acids | Andreas Maier | 2002-03-26 |
| 6348603 | Process for the preparation of isochroman-3-ones | Holger Geissler | 2002-02-19 |
| 6187952 | Two-step production of 3-chloro-4-fluoro-benzoyl chloride by chlorination | Thomas Wessel | 2001-02-13 |
| 6103659 | Catalyst comprising an amidophosphonium salt for halex reactions | Sergej Pasenok, Wolfgang Appel, Thomas Wessel, Thomas Schach, Hans H. Schubert | 2000-08-15 |
| 6075152 | Process for preparing isochroman-3-ones | Holger Geissler | 2000-06-13 |
| 6001831 | Process for producing quinazoline derivatives | Theodor Papenfuhs, Stefan Krause, Doris Neumann-Grimm | 1999-12-14 |
| 5973189 | Monoesters of carboxymethylene anthranilic acids and process for preparing the same | Theodor Papenfuhs, Doris Neumann-Grimm, Stefan Krause | 1999-10-26 |
| 5965775 | Process for the preparation of 3,5-difluoroaniline | Stefan Krause | 1999-10-12 |
| 5945556 | Process for preparing N-carboxymethylene-4-chloro-anthranilic acid and its dialkyl esters | Theodor Papenfuhs, Stefan Krause, Doris Neumann-Grimm | 1999-08-31 |
| 5874608 | Process for the preparation of esters of aromatic carboxylic acid | Theodor Papenfuhs | 1999-02-23 |
| 5849959 | Derivatives of 2, 3, 6-trifluorophenols and a process for their preparation | Rainer Wingen | 1998-12-15 |
| 5773651 | Process for the preparation of fluorine-containing chemical compounds | Friedrich Seitz | 1998-06-30 |
| 5744628 | Process for the preparation of esters of aromatic carboxylic acids | Theodor Papenfuhs | 1998-04-28 |
| 5739388 | Process for the preparation of aromatic compounds by decarboxylation of aromatic carboxylic acids | Hans H. Schubert | 1998-04-14 |
| 5723658 | Process for the preparation of salts of substituted or unsubstituted phthalic acids | Theodor Papenfuhs | 1998-03-03 |
| 5663410 | Cis-4-(2,2,3,3-tetrafluoropropoxy)-cinnamonitrile and trans-4-(2,2,3,3-tetrafluoropropoxy)-cinnamonitrile and a process for their preparation | Matthias Beller | 1997-09-02 |
| 5565612 | Substituted 2-chloro-3,4,5-trifluorobenzenes and a process for their preparation | Thomas Schach | 1996-10-15 |
| 5525258 | Trifluorophenylene compounds, process for their preparation, and their use in liquid-crystalline mixtures | Rainer Wingen | 1996-06-11 |
| 5516932 | Halogenated cinnamic acids and esters thereof, processes for the preparation thereof and halogenated aryldiazonium salts | Matthias Beller, Hartmut Fischer, Laurent Weisse, Klaus Forstinger, Heinz Strutz | 1996-05-14 |
| 5488152 | Process for the preparation of 4-alkoxy-3,5,6-trifluoro-phthalic acids and 3-alkoxy-2,4,5-trifluorobenzoic acids | Theodor Papenfuhs | 1996-01-30 |
| 5481032 | Process for the preparation of halogenated benzoic acids | — | 1996-01-02 |
| 5478963 | 2,3-difluoro-6-nitrobenzonitrile and 2-chloro-5,6-difluorobenzonitrile-(2,3-difluoro-6-chlorobenzonitrile), process for their preparation and their use for the preparation of 2,3,6-trifluorobenzoic acid | Theodor Papenfuhs | 1995-12-26 |