Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5131981 | Coloring paper | Erwin Hahn, Georg Henning, Manfred Mielke, Hans-Juergen Degen | 1992-07-21 |
| 4978427 | Water-soluble copolymers containing vinylamine units as wet strength and dry strength agent for paper | Michael Kroener, Heinrich Hartmann, Walter Denzinger | 1990-12-18 |
| 4880497 | Preparation of water-soluble copolymers containing vinylamine units, and their use as wet strength agents and dry strength agents for paper | Michael Kroener, Heinrich Hartmann, Walter Denzinger | 1989-11-14 |
| 4818341 | Production of paper and paperboard of high dry strength | Hans-Juergen Degen, Volkmar Weberndoerfer, Gerd Rehmer, Michael Kroener, Andreas Stange | 1989-04-04 |
| 4804387 | Liquid black dye mixture | Hans-Juergen Degen, Rudolf Bermes | 1989-02-14 |
| 4784724 | Making paper which has a high dry strength | Volkmar Weberndoerfer, Heinrich Hartmann, Friedrich Linhart | 1988-11-15 |
| 4774285 | Preparation of water-soluble copolymers containing vinylamine units, and their use as wet strength agents and dry strength agents for paper | Michael Kroener, Heinrich Hartmann, Walter Denzinger | 1988-09-27 |
| 4294873 | Manufacture of paper having a high dry strength and a low wet strength | Juergen Hartmann, Joachim Stedefeder, Walter Denzinger | 1981-10-13 |
| 4191692 | Manufacture of tocopherol | Paul Grafen, Henning Kroesche, Bernhard Schulz, Joachim Paust | 1980-03-04 |