Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5716446 | Isoindoline pigments based on aminoquinoxalinediones | Frank Alfter, Rudiger Jung | 1998-02-10 |
| 5698705 | Isoindoline pigments | Frank Alfter, Erwin Dietz, Siegfried Schiessler | 1997-12-16 |
| 5510494 | Process for the preparation of C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy and unsubstituted 2-(cyanomethyl)benzimidazole | Erwin Dietz | 1996-04-23 |
| 5074919 | Preparation of vat dyes and pigments of the perinone series | Erwin Dietz, Siegfried Schiessler | 1991-12-24 |
| 4986852 | Pigments and use thereof | Erwin Dietz, Michael Kappert, Frank Prokschy, Adolf Kroh, Manfred Urban | 1991-01-22 |
| 4372892 | Process for the preparation of 1-aminobenzene-5-.beta.-sulfatoethylsulfone-2,4-disulfonic acid, the 5-vinylsulfone compound and the alkali salts thereof | Hermann Fuchs, Fritz Meininger | 1983-02-08 |