Issued Patents All Time
Showing 26–50 of 91 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 | Ralf Pfirmann | 1995-12-26 |
| 5476976 | Process for preparing fluoronitrobenzenes | Thomas Schach | 1995-12-19 |
| 5473095 | Process for the preparation of chlorinated 4,5-difluorobenzoic acids, -benzoic acid derivatives and -benzaldehydes | Ralf Pfirmann, Georg Weichselbaumer | 1995-12-05 |
| 5468863 | Process for the preparation of substituted 2,3-difluoropyridines | Ralf Pfirmann | 1995-11-21 |
| 5466859 | Process for preparing fluorobenzonitriles | Thomas Schach, Ralf Pfirmann | 1995-11-14 |
| 5463148 | Process for the preparation of chlorofluoronitrobenzenes | Andreas Kanschik-Conradsen, Wilfried Pressler | 1995-10-31 |
| 5463135 | Fluorinated benzils and a process for their preparation | Andreas Kanschik-Conradsen | 1995-10-31 |
| 5451703 | Process for the preparation of biaryls | Thomas Schach, Joachim Hackenbruch | 1995-09-19 |
| 5430173 | Process for preparing alkyl 3-hydroxy-2, 4, 5-trifluorobenzoates and/or alkyl 3-alkoxy-2, 4, 5-trifluorobenzoates | Ralf Pfirmann | 1995-07-04 |
| 5384413 | Process for the preparation of tetrafluorophthalic acid and/or tetrafluorophthalic anhydride | Ralf Pfirmann | 1995-01-24 |
| 5304655 | N'-substituted N-amino-3,4,5,6-tetrafluorophthalimides, and processes for their preparation | Ralf Pfirmann | 1994-04-19 |
| 5294742 | Process for preparing 3,5-difluoroaniline | Thomas Schach | 1994-03-15 |
| 5292957 | Process for the preparation of N-alkylhalogenoanilines | Werner Brodt | 1994-03-08 |
| 5292967 | Process for producing 2,3-difluoro-6-nitrophenol | Joachim Hackenbruch, Ralf Pfirmann | 1994-03-08 |
| 5276203 | Process for the preparation of 1,2-bis-(2-nitrophenoxy)-ethane | Wilfried Pressler, Jochen Rapp | 1994-01-04 |
| 5274115 | N'-substituted N-amino-3,4,5,6-tetrafluorophthalimides | Ralf Pfirmann | 1993-12-28 |
| 5264633 | Process for the preparation of 1,4-bis(4-hydroxybenzoyl)benzene | Joachim Hackenbruch, Arnold Schneller | 1993-11-23 |
| 5250738 | Process for the preparation of 1,4-bis(4-hydroxybenzoyl)-benzene | Joachim Hackenbruch | 1993-10-05 |
| 5233083 | Process for the preparation of 2-amino-3-chlorobenzoic acid | Jochen Rapp | 1993-08-03 |
| 5227545 | Process for the preparation of 2,4-dichlorofluorobenzene | Georg Folz, Ralf Pfirmann | 1993-07-13 |
| 5227535 | Process for the preparation of 2-nitro-5-fluoro- or -5-chlorophenol | Ralf Pfirmann, Klaus Forstinger | 1993-07-13 |
| 5200556 | Process for the preparation of 3,4,6-trifluorophthalic acid and the anhydride thereof | Ralf Pfirmann | 1993-04-06 |
| 5191126 | Process for the preparation of difluorobenzaldehydes | Andreas Kanschik-Conradsen | 1993-03-02 |
| 5179230 | Process for the preparation of 2,3,4,5-tetrafluorobenzoic acid | Ralf Pfirmann | 1993-01-12 |
| 5151532 | Process for the production of high-purity tetrachloro-1,4-benzoquinone | Otto Arndt | 1992-09-29 |