Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885396 | Process for the preparation of 2-hydroxy-4-(2'-hydroxyethoxy) benzophenones | Peter Neumann | 1989-12-05 |
| 4861898 | Isoindoline metal complexes | Volker Radtke, Heinrich Kowarsch | 1989-08-29 |
| 4846892 | Tetrachloroperylene-3,4,9,10-tetracarboxylic acid diimide pigment and its use | Georg Henning, Peter Hauser, Manfred Patsch | 1989-07-11 |
| 4820809 | Heterocyclic azo dyes | Udo Bergmann, Guenter Hansen | 1989-04-11 |