Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7902141 | Polymer for treating surfaces | Heike Becker, Marcus Guzmann, Tanja Gass, Volker Braig | 2011-03-08 |
| 5378818 | Doubled azo dyes | Udo Mayer | 1995-01-03 |
| 5131981 | Coloring paper | Erwin Hahn, Georg Henning, Manfred Mielke, Sigberg Pfohl | 1992-07-21 |
| 4976888 | Antifoam based on oil-in-water emulsion | Arnold De Clercq, Wolfram Bergold, Jaroslav Melzer | 1990-12-11 |
| 4940514 | Making paper, board and cardboard of high dry strength | Andreas Stange, Werner Auhorn, Volkmar Weberndoerfer, Michael Kroener, Heinrich Hartmann | 1990-07-10 |
| 4935499 | Cationic azo dyes with a 1-hydroxynaphthalene 3-sulfonic acid coupling component, useful for coloring paper | Manfred Ruske | 1990-06-19 |
| 4908240 | Printability of paper | Werner Auhorn, Lothar Hoehr, Ulrich Riebeling | 1990-03-13 |
| 4855343 | Paper size based on finely divided aqueous dispersions | Fritz Reichel, Ulrich Riebeling, Lothar Hoehr | 1989-08-08 |
| 4835212 | Sizing agents for paper based on finely divided aqueous dispersions | Fritz Reichel, Ulrich Riebeling, Lothar Hoehr | 1989-05-30 |
| 4818341 | Production of paper and paperboard of high dry strength | Sigberg Pfohl, Volkmar Weberndoerfer, Gerd Rehmer, Michael Kroener, Andreas Stange | 1989-04-04 |
| 4804387 | Liquid black dye mixture | Rudolf Bermes, Sigberg Pfohl | 1989-02-14 |
| 4772359 | Production of paper, board and cardboard | Friedrich Linhart, Werner Auhorn, Michael Kroener, Heinrich Hartmann, Wilfried Heide | 1988-09-20 |
| 4770743 | Engine size for paper, based on fatty alkyl diketenes and cationic polyacrylamides | Volkmar Weberndoerfer, Enrique Freudenberg, Ulrich Riebeling | 1988-09-13 |
| 4671799 | Dye mixtures for paper stock | Hans-Joachim Kraus | 1987-06-09 |
| 4656256 | Benzoazoresorcinol dyes containing a quaternized aminoalkylene oxycarbonyl group | Horst Colberg, Johannes P. Dix | 1987-04-07 |
| 4444959 | Water-soluble benzylated polyamidoamines | Guenter Frey, Werner Streit, Rolf Fikentscher, Wolf Guender | 1984-04-24 |
| 4425238 | Removal of anionic compounds from water | Wolf Guender, Friedrich Linhart, Werner Auhorn, Guenter Frey, Werner Streit +1 more | 1984-01-10 |
| 4397651 | Polymeric dyes derived from bis-reactive methylene compounds and aromatic di-aldehydes for paper | Klaus Grychtol | 1983-08-09 |
| 4383834 | Coloring of paper | Wolf Guender, Guenter Frey, Werner Streit, Rolf Fikentscher, Klaus Wulz | 1983-05-17 |
| 4353833 | Cationic dyes | Horst Bruder, Franz Feichtmayr, Klaus Grychtol, Udo Mayer | 1982-10-12 |
| 4323362 | Dyed paper | Klaus Grychtol | 1982-04-06 |
| 4301272 | Addition polymers of dimorpholone compounds and diamines | Herbert Naarmann | 1981-11-17 |
| 4267319 | Colored polymeric compounds | — | 1981-05-12 |
| 4256458 | Methine dyes for paper and amonically-modified fibers | Franz Feichtmayr, Klaus Grychtol | 1981-03-17 |
| 4212644 | Dyed paper | Klaus Grychtol | 1980-07-15 |