Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883880 | Process for the preparation of sulfoalkyl quaternary salts and for the production of alkane sultones | Helmut Kampfer | 1989-11-28 |
| 4847179 | Photographic dye diffusion transfer process and color photographic recording material suitable for this process | Immo Boie, Manfred Peters, Thomas Kaluschke, Gunther Schenk, Kaspar Wingender +1 more | 1989-07-11 |
| 4845024 | Hardeners for proteins, a binder layer hardened therewith and a photographic recording material containing such a layer | Johannes Sobel, Hans Ohlschlager, Karl-Wilhelm Schranz | 1989-07-04 |