Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5554261 | Dyeing of paper | Claudia Nilz, Norbert Sendhoff, Manfred Zillig, Primoz Lorencak | 1996-09-10 |
| 5531797 | Aqueous dye preparations containing coumarin dyes | Rudolf Bermes | 1996-07-02 |
| 5051504 | Doubled triphenylmethane dyes having bis acylpiperazine linkage | Erwin Hahn, Udo Mayer, Gunter-Rudolf Schroeder | 1991-09-24 |
| 4912006 | Electrostatic toner | Erwin Czech, Udo Mayer, Guenther Seybold, Horst Bruder, Rainer Dyllick-Brenzinger | 1990-03-27 |
| 4784668 | Novel heterocycle-containing trisazo dyes | Udo Mayer, Guenther Seybold | 1988-11-15 |