Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831140 | Process for the preparation of arylimides of perylene-3,4,9,10-tetracarboxylic acid | Helmut Troster | 1989-05-16 |
| 4797162 | Process for the preparation of perylene-3,4,9,10-tetracarboxylic acid N,N'- d | Manfred Urban | 1989-01-10 |