Issued Patents 1989
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873338 | Process for the preparation of 2-amino-5-acylamino phenols and starting compounds suitable therefor | Heinz Wiesen | 1989-10-10 |
| 4871657 | Color photographic recording material with easily dispersible color couplers | — | 1989-10-03 |
| 4865960 | Polymeric magneta coupler and a colour photographic recording material containing this polymeric magenta coupler | Gunter Helling | 1989-09-12 |
| 4855222 | Color photographic recording material | Gunter Renner, Heinz Wiesen, Werner Liebe | 1989-08-08 |
| 4845022 | Color photographic recording material containing a color coupler of the pyrazoloazole type | — | 1989-07-04 |
| 4835094 | Color photographic recording material containing a color coupler of the pyrazoloazole series | Hans-Joachim Schumann | 1989-05-30 |
| 4812576 | Imino derivatives of 4-halogen-pyrazolone-5 | Dieter Lowski, Harry Elias | 1989-03-14 |