Issued Patents All Time
Showing 26–50 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4579817 | Color photographic recording material containing dye-releasers releasing 6-arylazo-2-amino-3-pyridinol dyes which are chelatable with metal ions | Gerhard Wolfrum, Holger Heidenreich | 1986-04-01 |
| 4579805 | Color photographic recording material containing a thiophene azo dye releaser for cyan dyes | Hauke Furstenwerth, Rudolf Stolzenburg, Paul Marx, Holger Heidenreich | 1986-04-01 |
| 4559296 | Photographic recording material containing new azo dyes | Lothar Rosenhahn, Karl J. Herd, Hauke Fuerstenwerth, Rudolf Stolzenburg | 1985-12-17 |
| 4546073 | Photographic recording material containing a precursor of a photographically-active compound | Heinrich Odenwalder, Reinhard Matejec | 1985-10-08 |
| 4524123 | Chelatable 4-thienyl imidazole azo dyes, their use in color photographic recording material | Gunther Schenk, Holger Heidenreich, Gerhard Wolfrum | 1985-06-18 |
| 4524124 | Color photographic recording material containing a thiazole azo dye releaser for cyan dyes | Rudolf Stolzenburg, Paul Marx, Rainer Hamprecht | 1985-06-18 |
| 4521506 | Monoazo pyridinol dyes chelated or capable of being chelated with metal ions and their use for image production | Rudolf Stolzenburg, Gerhard Wolfrum, Jurgen Strauss | 1985-06-04 |
| 4474854 | Photographic material containing a layer capable of being dyed by organic dyes | Jurgen Strauss | 1984-10-02 |
| 4461827 | Color photographic recording material containing a non-diffusible dye releaser from which a complexible azo dye is released during development | Gunther Schenk, Gerhard Wolfrum | 1984-07-24 |
| 4446219 | Photographic material comprising a layer with Ni complex of 2,2'-bisphenol | Jurgen Strauss | 1984-05-01 |
| 4418143 | Color photographic recording material | Gunther Schenk, Gerhard Wolfrum, Hans-Volker Runzheimer, Holger Heidenreich | 1983-11-29 |
| 4396710 | Photographic recording material with metal complexable, heterocyclic azo dye | Gunther Schenk, Gerhard Wolfrum, Hans-Volker Runzheimer | 1983-08-02 |
| 4393132 | Photographic recording material with arylazocyanoacetic ester dye releasers | Gunther Schenk, Gerhard Wolfrum, Rudolf Stolzenburg | 1983-07-12 |
| 4386155 | Process for the production of photographic images | Friedrich-Wilhelm Kunitz, Karl-Wilhelm Schranz, Erich Wolff | 1983-05-31 |
| 4383021 | Image-receiving element for the dye diffusion transfer process with metal complex of diazabicyclooctane | Guenter Helling, Jurgen Strauss | 1983-05-10 |
| 4355185 | Process for the preparation of 2-mercaptoalkyl-sulphides and 2-mercaptoalkylethers | Peter Wenzl | 1982-10-19 |
| 4349624 | Photographic silver halide material | Johannes Sobel, Wolfgang Himmelmann | 1982-09-14 |
| 4338394 | Process for hardening photographic gelatin | Wolfgang Himmelmann, Johannes Sobel | 1982-07-06 |
| 4334013 | Use of copolymers in the production of photographic emulsions and photographic materials | Helmut Sommer | 1982-06-08 |
| 4329441 | Process for the polymerization of allyl ammonium salts and the resulting products | — | 1982-05-11 |
| 4323646 | Process for hardening a photographic material | Wolfgang Himmelmann, Johannes Sobel | 1982-04-06 |
| 4297439 | Production of photographic silver halide emulsion | Wilhelm Saleck, Otto Lapp, Bruno Mucke | 1981-10-27 |
| 4294920 | Photographic silver halide emulsion | Gunter Helling, Wilhelm Saleck | 1981-10-13 |
| 4284718 | Photographic silver halide materials containing sulfur containing polymers | Wilhelm Saleck, Gunter Helling | 1981-08-18 |
| 4233398 | Process for the hardening of photographic layers utilizing fast acting hardener and polysaccharide | Fritz Nittel, Karl Czernik, Wolfgang Sauerteig, Wolfgang Himmelmann | 1980-11-11 |