Issued Patents All Time
Showing 25 most recent of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8278238 | Triplet emitter having condensed five-membered rings | Hans-Hermann Johannes, Wolfgang Kowalsky, Sven Ammermann, Ute Jana Weinaug | 2012-10-02 |
| 5662781 | Elimination of nitrile impurities from polymers | Walter Denzinger, Heinrich Hartmann, Claudia Nilz | 1997-09-02 |
| 5630907 | Use of hydrolyzed copolymers of N-vinylcarboxamides and monoethylenically unsaturated carboxylic acids in papermaking | Claudia Nilz, Walter Denzinger, Heinrich Hartmann, Friedrich Linhart, Rudolf Schuhmacher +2 more | 1997-05-20 |
| 5599898 | Insoluble, only slightly swellable polymers containing amino groups, their preparation and their use | Heinrich Hartmann, Walter Denzinger, Claudia Nilz | 1997-02-04 |
| 5578678 | Graft polymers of natural substances containing saccharide structures or derivatives thereof and ethylenically unsaturated compounds and their use | Heinrich Hartmann, Walter Denzinger, Claudia Nilz, Friedrich Linhart, Andreas Stange | 1996-11-26 |
| 5554718 | Catonic urea/formaldehyde resins, their preparation and their use in the paper industry | Klaus Flory, Andreas Stange, Norbert Sendhoff | 1996-09-10 |
| 5543459 | Graft polymers of natural substances containing saccharide structures or derivatives thereof and ethylenically unsaturated compounds and their use | Heinrich Hartmann, Walter Denzinger, Claudia Nilz, Friedrich Linhart, Andreas Stange | 1996-08-06 |
| 5478656 | Cationic urea/formaldehyde resins, their preparation and their use in the paper industry | Klaus Flory, Andreas Stange, Norbert Sendhoff | 1995-12-26 |
| 5359082 | Preparation of 4-substituted imidazoles from N-formyl-.alpha.-aminonitrile | Ulrich Koehler, Thomas-Michael Kahl, Horst Neuhauser, Hardo Siegel | 1994-10-25 |
| 5334287 | Graft polymers of natural substances containing saccharide structures or derivatives thereof and ethylenically unsaturated compounds and their use | Heinrich Hartmann, Walter Denzinger, Claudia Nilz, Friedrich Linhart, Andreas Stange | 1994-08-02 |
| 5326909 | Stabilization of monomeric N-vinylformamide | Jacques Dupuis | 1994-07-05 |
| 5290880 | Preparation of finely divided, water-soluble polymers containing vinylamine units | Dietmar Moench, Enrique Freudenberg, Heinrich Hartmann, Norbert Sendhoff | 1994-03-01 |
| 5155270 | Anionically polymerized N-vinylformamide and the preparation thereof | Rolf Fikentscher | 1992-10-13 |
| 5145559 | Production of paper, board and cardboard | Werner Auhorn, Friedrich Linhart, Primoz Lorencak, Norbert Sendhoff, Walter Denzinger +1 more | 1992-09-08 |
| 5126395 | Preparation of stable water-in-oil emulsions of hydrolyzed polymers of N-vinylamides | Lutz End, Walter Denzinger, Norbert Sendhoff, Enrique Freudenberg, Friedrich Linhart +2 more | 1992-06-30 |
| 5098521 | Production of paper, board and cardboard from paper stocks containing foreign materials | Enrique Freudenberg, Friedrich Linhart, Rainer Tresch, Heinrich Hartmann, Walter Denzinger +1 more | 1992-03-24 |
| 5077427 | Preparation of alpha-formylamino nitriles | Rolf Fikentscher | 1991-12-31 |
| 5077426 | Preparation of alpha-formylamino nitriles | Rolf Fikentscher | 1991-12-31 |
| 5008321 | Preparation of stable water-in-oil emulsions of hydrolyzed polymers of N-vinylamides and their use | Heinrich Hartmann, Walter Denzinger, Norbert Sendhoff, Enrique Freudenberg | 1991-04-16 |
| 4978427 | Water-soluble copolymers containing vinylamine units as wet strength and dry strength agent for paper | Sigberg Pfohl, Heinrich Hartmann, Walter Denzinger | 1990-12-18 |
| 4940514 | Making paper, board and cardboard of high dry strength | Andreas Stange, Hans-Juergen Degen, Werner Auhorn, Volkmar Weberndoerfer, Heinrich Hartmann | 1990-07-10 |
| 4880497 | Preparation of water-soluble copolymers containing vinylamine units, and their use as wet strength agents and dry strength agents for paper | Sigberg Pfohl, Heinrich Hartmann, Walter Denzinger | 1989-11-14 |
| 4859642 | Fixed-bed catalyst structure obtained using honeycomb elements | Wolfgang Hoelderich, Peter Kroetzsch, Werner Biffar | 1989-08-22 |
| 4818341 | Production of paper and paperboard of high dry strength | Hans-Juergen Degen, Sigberg Pfohl, Volkmar Weberndoerfer, Gerd Rehmer, Andreas Stange | 1989-04-04 |
| 4814505 | Purification of n-vinylformamide | Willi Schmidt, Alfred Oftring, Theo Proll, Heinrich Hartmann | 1989-03-21 |