Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5891227 | Aqueous dye preparations | Dietrich Hoffmann, Ulrike Schlosser, Erwin Czech, Walter Kurtz, Karin H. Beck +2 more | 1999-04-06 |
| 5814139 | Ballpoint pen pastes with phthalocyanine pigments | Karin H. Beck, Erwin Czech, Walter Kurtz | 1998-09-29 |
| 5616644 | Dyestuff-containing aqueous dispersions | Bernhard Schlarb, Kurt Wendel, Karin H. Beck | 1997-04-01 |
| 5607762 | Ink-ribbons comprising IR-absorbing compounds | Bernhard Albert, Juergen Kipper, Friedrich Closs | 1997-03-04 |
| 5567233 | Process for preparing ballpoint pen pastes with colored metal oxide pigments | Karin H. Beck, Claudius Kormann, Rainer Dyllick-Brenzinger | 1996-10-22 |
| 5254163 | Pigment preparations | — | 1993-10-19 |
| 5205838 | Liquid dye preparations: bis phenyl-azo-resorcinol in solvent for colored ribbon or ball pen ink | Rainer Dyllick-Brenzinger, Heinz Hartmann, Georg Zeidler | 1993-04-27 |