Issued Patents All Time
Showing 1–25 of 45 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6464768 | Water-soluble stilbene dyes, their preparation and use | Heidemarie Menzel, Josef Geisenberger, Reinhard Pedrazzi | 2002-10-15 |
| 6432185 | Red acid dyes for injet printing and paper dyeing | Josef Geisenberger, Heidemarie Menzel, Reinhard Pedrazzi | 2002-08-13 |
| 6406527 | Water-soluble red acid dyes, their preparation and use | Josef Geisenberger, Heidemarie Menzel, Reinhard Pedrazzi | 2002-06-18 |
| 6359131 | Process for preparing dioxazine compounds | Gert Nagl, Peter Kempter | 2002-03-19 |
| 6274749 | High-temperature resistant sulfonated aromatic polyether ketone cation exchangers and sulfonated poly (phenylene sulfide) cation exchangers as catalysts at reaction temperature above 150.degree. C | Werner Sievers, Ulrich Daiminger, Harald Bönsel, Joachim Semel | 2001-08-14 |
| 5981766 | Process for the preparation of 4,4'-dimethyl-6,6'-dichlorothioindigo | Uwe Baeumler, Hans-Joachim Kurz, Hans-Peter Kreutzer | 1999-11-09 |
| 5961668 | 4-(2,4-diaminophenoxymethyl)-1,3-dioxolane secondary intermediates, processes for their production, and hair colorants | Mustafa Akram, Andreas Bittner, Astrid Kleen | 1999-10-05 |
| 5948910 | Water-soluble perylene dyestuffs, their preparation and their use | Dieter Baumgart, Dieter Schnaitmann, Klaus-Peter Kreutzer, Walter Zoller | 1999-09-07 |
| 5932727 | Process for the preparation of dioxazine compounds | Gert Nagl, Manfred Urban, Dieter Schnaitmann | 1999-08-03 |
| 5922086 | Hair colorants based on perimidine derivatives | Mustafa Akram, Herbert Deutz | 1999-07-13 |
| 5902884 | Process for preparing N-alkylcarbazoles | Klaus Delpy, Gert Nagl, Leonhard Unverdorben | 1999-05-11 |
| 5882360 | Water-soluble copper phthalocyanine dyestuffs, their preparation and their use | Dieter Baumgart, Walter Zoller, Klaus-Peter Kreutzer | 1999-03-16 |
| 5783710 | Benzothioxanthene dyes, their preparation and their use | Dieter Baumgart, Walter Zoller | 1998-07-21 |
| 5767292 | Processes for preparing 1-methoxy-2-propyl 3-(7-diethylamino-2-oxo-2H-chromen-3-yl)-3-oxopropionate | Peter Koch | 1998-06-16 |
| 5668260 | Tetrakisazo Compounds, the method of preparation thereof and the process of pyeing | Dieter Baumgart, Walter Zoller | 1997-09-16 |
| 5613985 | Hair coloring compositions which contain developers and perimidine couplers | Mustafa Akram | 1997-03-25 |
| 5597387 | Water-soluble polyazo dyestuffs | Dieter Baumgart, Walter Zoller | 1997-01-28 |
| 5510489 | Method of preparing 1-amino-2, 6-dimethylpiperidine | Wolfgang Rybczynski, Eckard Kujath, Manfred Schrod | 1996-04-23 |
| 5508467 | Process for the preparation of hydroxyalkylaminonitrobenzene derivatives | Klaus Delpy, Andreas Bittner | 1996-04-16 |
| 5383961 | Water-soluble sulphur dyes, their preparation and use | Gert Nagl, Willi Steckelberg, Josef Ritter, Wilhelm Mauelshagen | 1995-01-24 |
| 5374302 | Water-insoluble sulphur dyes, their preparation and use | Willi Steckelberg, Josef Ritter, Wilhelm Mauelshagen | 1994-12-20 |
| 5368637 | Water-insoluble sulphur dyes, their preparation and use | Willi Steckelberg, Josef Ritter, Wilhelm Mauelshagen | 1994-11-29 |
| 5347019 | Process for the preparation of 4-(2-aminophenylthio)naphthalic anhydride derivatives | Wassilis Koumbouris | 1994-09-13 |
| 5280128 | Process for the preparation of benzothioxanthene dyestuffs | Eberhard Grimm, Uwe Nickel, Manfred Schrod, Herbert Wille | 1994-01-18 |
| 5240466 | Dyeing leather with water-insoluble sulphur dyes | Hubert Kruse, Gert Nagl, Jan Mast, Lothar Schlosser | 1993-08-31 |