Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866183 | Preparation of hexaarylbisimidazoles | Uwe Kempe, Toni Dockner, Helmut Karn, Thomas Bluemel, Reinhold J. Leyrer | 1989-09-12 |
| 4857438 | Photochromic system and layers produced therewith | Reinhold J. Leyrer | 1989-08-15 |