Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4378969 | Fluid formulations of oxidation dyes for mineral oil products, fats and waxes | Guenter Hansen, Rudolf Senninger, Georg Zeidler | 1983-04-05 |
| 4321055 | Navy dye mixtures and their use in dyeing polyesters | Guenter Hansen, Wolf-Dieter Kermer | 1982-03-23 |
| 4285860 | Trisazo or tetrakisazo dyes containing a heterocyclic group | Guenter Hansen, Horst Scheuermann, Georg Zeidler | 1981-08-25 |