Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840871 | Color photographic heat development process | Manfred Peters, Thomas Kaluschke, Kaspar Wingender, Gunther Schenk, Immo Boie | 1989-06-20 |
| 4833070 | Color photographic recording material containing a yellow DIR coupler | Friedrich-Wilhelm Kunitz, Heinrich Odenwalder, Dirk Hubner | 1989-05-23 |