Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870000 | Color photograhic recording material containing a coupler which releases a photographically active compound | Peter Bergthaller, Rudolf Stolzenburg | 1989-09-26 |
| 4840880 | Color photographic recording material containing a yellow DIR coupler | Hans Ohlschlager, Gunter Renner, Friedrich-Wilhelm Kunitz, Heinrich Odenwalder | 1989-06-20 |
| 4833070 | Color photographic recording material containing a yellow DIR coupler | Friedrich-Wilhelm Kunitz, Hans hlschlager, Heinrich Odenwalder | 1989-05-23 |