Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883732 | Method of forming printing plate using isoindolenine deratives | Peter Neumann | 1989-11-28 |
| 4880718 | Electrophotographic recording element with isoindolenine derivatives | Peter Neumann | 1989-11-14 |
| 4866183 | Preparation of hexaarylbisimidazoles | Uwe Kempe, Toni Dockner, Helmut Karn, Thomas Bluemel, Thomas Loerzer | 1989-09-12 |
| 4857438 | Photochromic system and layers produced therewith | Thomas Loerzer | 1989-08-15 |