Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4578469 | Benzo[de]pyrano[3,2-g]isoquinoline derivatives useful as dyestuffs | Hans-Matthias Deger, Rudiger Erckel | 1986-03-25 |
| 4336155 | Mixtures of optical brighteners | Thomas Martini, Rudiger Erckel, Gunter Rosch, Heinz Probst | 1982-06-22 |
| 4330427 | Mixtures of optical brighteners | Thomas Martini, Rudiger Erckel, Gunter Rosch, Heinz Probst | 1982-05-18 |
| 4219651 | Benzimidazo-[1,2-a]-quinolines | Dieter Gunther, Rudiger Erckel | 1980-08-26 |