Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4798627 | Dampening agent for offset printing | Dieter Schmitt | 1989-01-17 |
| 4797162 | Process for the preparation of perylene-3,4,9,10-tetracarboxylic acid N,N'- d | Ernst Spietschka | 1989-01-10 |