Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840880 | Color photographic recording material containing a yellow DIR coupler | Hans Ohlschlager, Gunter Renner, Friedrich-Wilhelm Kunitz, Dirk Hubner | 1989-06-20 |
| 4833070 | Color photographic recording material containing a yellow DIR coupler | Friedrich-Wilhelm Kunitz, Hans hlschlager, Dirk Hubner | 1989-05-23 |
| 4820616 | Color photographic recording material | Reinhart Matejec, Manfred Becker, Hans-Joerg Metz | 1989-04-11 |