Issued Patents All Time
Showing 25 most recent of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6336942 | Processes of treating leather and skins employing polymer compositions | Peter Danisch, Walter Denzinger, Axel Kistenmacher, Michael Kneip, Hans-Joachim Muller +2 more | 2002-01-08 |
| 6080209 | Stable colorant compositions | Matthias Wiesenfeldt, Rudolf Paulus, Manfred Herrmann | 2000-06-27 |
| 5972050 | Dye mixtures containing polyazo dyes and CI Sulphur Black 1 dye | Matthias Wiesenfeldt, Rolf Streicher, Manfred Herrmann, Gunther Lamm | 1999-10-26 |
| 5750742 | Oligomeric triarylmethane dyes | Gunter Schroder, Udo Mayer, Ulf Baus | 1998-05-12 |
| 5534166 | Preparation of condensates of arenesulfonic acids and formaldehyde and use thereof | Ralf Brueckmann, Rolf Fikentscher, Manfred Herrmann, Norbert Zimmermann | 1996-07-09 |
| 5491043 | Electrostatic toners with polyamine charge stabilizers | Ulf Baus, Karin H. Beck, Friedrich-Wilhelm Raulfs | 1996-02-13 |
| 5411556 | Dyeing leather with a red azo dye | Gunther Lamm, Helmut Reichelt, Georg Zeidler | 1995-05-02 |
| 5393463 | Use of trialkanolamine polyethers as demulsifiers for oil-in-water emulsions | Rolf Fikentscher, Knut Oppenlaender, Wilfried Sager, Hans-Henning Vogel, Klaus Barthold +1 more | 1995-02-28 |
| 5389110 | Azo dyes and process of dyeing with azo dyes which contain an N-(hydroxysulfonylphenylalkyl)pyridone coupling component | Bernd Hupfeld, Gunther Lamm, Helmut Reichelt | 1995-02-14 |
| 5360454 | Tanning of leather and fur | Norbert Grief, Knut Oppenlaender, Hermann Birkhofer, Brigitte Wegner | 1994-11-01 |
| 5298635 | Tertiary amides useful as low-foam wetting agents in the textile industry | Eberhard Beckmann, Ralf Brueckmann, Peter Freyberg, Erich Kromm | 1994-03-29 |
| 5264560 | Preparation of quaternized azo dyes | Guenter Hansen, Helmut Reichelt, Clemens Grund | 1993-11-23 |
| 5234626 | Methods of demulsifying employing condensates as demulsifiers for oil-in water emulsions | Rolf Fikentscher, Knut Oppenlaender, Wilfried Sager, Hans-Henning Vogel, Guenther Elfers | 1993-08-10 |
| 5224963 | Quaternized condensation products for aftertreating dyed leather | Rolf Fikentscher, Ortwin Schaffer, Rolf Streicher | 1993-07-06 |
| 5186846 | Dye dispersants: aryl sulphonic acid-formaldehyde condensate or ligninsulfonate | Ralf Brueckmann, Willi Bury, Manfred Herrmann, Waldemar Dlugosch, Erich Kromm +4 more | 1993-02-16 |
| 5124438 | Chemically modified proteins and colorant formulations containing the same | Ralf Brueckmann, Manfred Herrmann, Herbert Leiter, Norbert Zimmermann | 1992-06-23 |
| 5073634 | Tetrachloroferrates of basic dyes | Guenter Hansen, Hellmut Kast | 1991-12-17 |
| 5015754 | Quaternized condensation products of trialkanolamines | Rolf Fikentscher, Ingrid Steenken-Richter | 1991-05-14 |
| 4997680 | Polymeric conditioner for pretreating nonmetallic surfaces for chemical metallization | Chung-Ji Tschang, Ekhard Winkler, Guenther Gotsmann, Klaus Glaser, Rolf Fikentscher | 1991-03-05 |
| 4976744 | Preparation of concentrated solutions of cationic dyes as mono-carboxylates in glycol ether | Guenter Hansen, Hellmut Kast | 1990-12-11 |
| 4940492 | Colorant mixtures containing isoquinoline derivatives, use thereof in printing inks, and novel isoquinoline derivatives | Heinrich Kowarsch | 1990-07-10 |
| 4940609 | Polymeric conditioner for pretreating nonmetallic surfaces for chemical metallization | Chung-Ji Tschang, Ekhard Winkler, Guenther Gotsmann, Klaus Glaser, Rolf Fikentscher | 1990-07-10 |
| 4912791 | Pretreatment of textile materials: alkaline scour or bleach with organo-phosphorus compound | Werner Streit, Wolfgang Schenk, Matthias Kummer, Alfred Oftring | 1990-04-03 |
| 4908437 | Thien-2-one compounds with an alkylidene or imino group in the 5-position of the ring | Guenter Hansen, Helmut Reichelt, Masahiro Hayashi | 1990-03-13 |
| 4880769 | Transfer of catinic dyes in their deprotonated, electrically neutral form | Karl-Heinz Etzbach, Udo Mayer, Ruediger Sens | 1989-11-14 |