Issued Patents All Time
Showing 1–25 of 50 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5534166 | Preparation of condensates of arenesulfonic acids and formaldehyde and use thereof | Ralf Brueckmann, Johannes P. Dix, Manfred Herrmann, Norbert Zimmermann | 1996-07-09 |
| 5393463 | Use of trialkanolamine polyethers as demulsifiers for oil-in-water emulsions | Knut Oppenlaender, Johannes P. Dix, Wilfried Sager, Hans-Henning Vogel, Klaus Barthold +1 more | 1995-02-28 |
| 5322915 | Modified melamine-formaldehyde resins | Juergen Weiser, Wolfgang Reuther, Wolfgang Fath, Heinz Berbner, Hans D. Zettler +1 more | 1994-06-21 |
| 5234626 | Methods of demulsifying employing condensates as demulsifiers for oil-in water emulsions | Knut Oppenlaender, Johannes P. Dix, Wilfried Sager, Hans-Henning Vogel, Guenther Elfers | 1993-08-10 |
| 5224963 | Quaternized condensation products for aftertreating dyed leather | Johannes P. Dix, Ortwin Schaffer, Rolf Streicher | 1993-07-06 |
| 5155270 | Anionically polymerized N-vinylformamide and the preparation thereof | Michael Kroener | 1992-10-13 |
| 5126395 | Preparation of stable water-in-oil emulsions of hydrolyzed polymers of N-vinylamides | Lutz End, Walter Denzinger, Michael Kroener, Norbert Sendhoff, Enrique Freudenberg +2 more | 1992-06-30 |
| 5077427 | Preparation of alpha-formylamino nitriles | Michael Kroener | 1991-12-31 |
| 5077426 | Preparation of alpha-formylamino nitriles | Michael Kroener | 1991-12-31 |
| 5036699 | Apparatus for testing fuel additives and oil additives | Knut Oppenlaender, Roland Schwen | 1991-08-06 |
| 5025103 | Glycerol aminocarboxylates and preparation and use thereof | Alfred Oftring, Stefan Birnbach, Richard Baur, Alexander Kud, Ulrich Goeckel +1 more | 1991-06-18 |
| 5019296 | Serine-N,N-diacetic acid and derivatives as complexing agents and detergents containing same | Richard Baur, Felix Richter, Stefan Birnbach, Alfred Oftring, Ekhard Winkler | 1991-05-28 |
| 5017725 | Preparation of addition salts of cysteamine with acids | Andreas Hohmann, Wolfgang Reuther, Theo Proll | 1991-05-21 |
| 5015754 | Quaternized condensation products of trialkanolamines | Johannes P. Dix, Ingrid Steenken-Richter | 1991-05-14 |
| 4997680 | Polymeric conditioner for pretreating nonmetallic surfaces for chemical metallization | Chung-Ji Tschang, Johannes P. Dix, Ekhard Winkler, Guenther Gotsmann, Klaus Glaser | 1991-03-05 |
| 4978780 | Preparation of ether sulfonates and polyglycol ether sulfonates, and products prepared by this method | Norbert Greif, Knut Oppenlaender, Karl Stork | 1990-12-18 |
| 4973730 | Preparation of serine-N,N-diacetic acid and derivatives as complexing agents and detergents containing same | Richard Baur, Felix Richter, Stefan Birnbach, Alfred Oftring, Ekhard Winkler | 1990-11-27 |
| 4970321 | Preparation of cyclic N,N'-dimethylureas | Rainer Betz, Erwin Hahn | 1990-11-13 |
| 4952332 | Detergents that contain acyl derivatives of dihydroxydioxane as bleach activators | Alfred Oftring, Werner Bochnitschek, Gerold Braun, Johannes Perner, Ulrich Kaluza +1 more | 1990-08-28 |
| 4945166 | Preparation of N-hydroxypyrazoles | Ulf Baus, Wolfgang Reuther | 1990-07-31 |
| 4940609 | Polymeric conditioner for pretreating nonmetallic surfaces for chemical metallization | Chung-Ji Tschang, Johannes P. Dix, Ekhard Winkler, Guenther Gotsmann, Klaus Glaser | 1990-07-10 |
| 4936864 | Condensates of bis-(4-hydroxyphenyl) sulfone as tanning assistants, their preparation and use in the tanning of leather | Dietrich Lach, Ortwin Schaffer, Rolf Streicher, Alfred Oftring | 1990-06-26 |
| 4935162 | Alkoxylated amido-containing polyamines and their use for breaking oil-in-water and water-in-oil emulsions | Klaus Barthold, Richard Baur, Juergen Lasowski, Knut Oppenlaender | 1990-06-19 |
| 4931065 | Aftertreatment of reactive dyeings on cellulose fibers | Ulrich Baumgarte, Sigismund Heimann, Heinrich Mertens, Siegfried Schneider, Michele Vescia | 1990-06-05 |
| 4911888 | Use of salts of sulfonamidocarboxylic acids as corrosion inhibitors in aqueous systems | Gerold Braun, Chung-Ji Ischang, Christos Vamvakaris, Reinhold Kohlhaupt | 1990-03-27 |