Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5362615 | Photographic recording material containing a hydroquinone diether compound | Ralf Weimann, Erich Wolff, Johannes Sobel | 1994-11-08 |
| 5340709 | Photographic recording material | Gunter Helling | 1994-08-23 |
| 5310643 | Photographic recording material containing a light-protective agent | Gunter Helling | 1994-05-10 |