Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5085981 | Photographic silver halide element with protective layer | Prem Lalvani, Hans-Theo Buschmann, Gunter Helling | 1992-02-04 |
| 5057276 | Process for the preparation of reagent layers containing hydrophobic reagents | Gunter Helling, Gary M. Oosta, Helmut Reiff, Alexander Riebel, Karl-Wilhelm Schranz | 1991-10-15 |
| 4978607 | Photographic recording material | Edouard Roche, Hans-Theo Buschmann, Heinz Quambusch | 1990-12-18 |
| 4939079 | Photographic recording material | Erich Wolff, Hans Langen, Gunter Helling | 1990-07-03 |
| 4939077 | Photographic recording material containing polyester compounds having free acid groups | Gunter Helling | 1990-07-03 |
| 4906560 | Photographic material | Fritz Nittel, Rudolf Tromnau, Erich Muller | 1990-03-06 |
| 4894324 | Hardeners for proteins, a layer of binder hardened therewith and a photographic recording material containing such a layer | Johannes Sobel, Hans hlschlager, Karl-Wilhem Schranz | 1990-01-16 |
| 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 |
| 4724197 | Color photographic recording material and a process for the production of color photographic images | Reinhart Matejec, Gunter Helling | 1988-02-09 |
| 4714671 | Color photographic recording material containing a polymeric gelatine plasticizer | Gunter Helling | 1987-12-22 |
| 4710454 | Photographic recording material and a process for the production of photographic images | Hans Langen, Heinz-Dieter Schutz, Ubbo Wernicke, Gunter Renner | 1987-12-01 |
| 4603102 | Photographic silver halide recording material with cellulose dicarboxylic acid semiester particles in outer layer | Fritz Nittel, Rudolf Meyer, Lothar Rosenhahn | 1986-07-29 |
| 4548887 | Dye diffusion transfer process wherein proteolytic enzyme decomposes light sensitive element | Gunter Helling | 1985-10-22 |
| 4524131 | Photographic silver halide recording material with graft copolymer particles in outer layer | Gunter Sackmann, Rudolf Meyer | 1985-06-18 |
| 4388403 | Process for the preparation of dispersions of hydrophobic substances in water | Gunter Helling, Helmut Reiff, Gunter Renner | 1983-06-14 |
| 4379838 | Photosensitive photographic recording material comprising a dyed layer | Gunter Helling, Hans hlschlager, Manfred Beck | 1983-04-12 |
| 4353972 | Light-sensitive photographic material comprising polymeric mordant layer | Gunter Helling, Kaspar Wingender, Manfred Beck | 1982-10-12 |
| 4349624 | Photographic silver halide material | Johannes Sobel, Peter Bergthaller | 1982-09-14 |
| 4338394 | Process for hardening photographic gelatin | Peter Bergthaller, Johannes Sobel | 1982-07-06 |
| 4323646 | Process for hardening a photographic material | Peter Bergthaller, Johannes Sobel | 1982-04-06 |
| 4287299 | Process for the production of matting layers | Rolf Brück, Wolfgang Sauerteig, Peter Kruck, Gunter Kolb, Gunter Sackmann | 1981-09-01 |
| 4284708 | Photographic film unit for the production of colored transfer images | Gunter Helling, Werner Krafft, Kurt Charles Findeisen | 1981-08-18 |
| 4233398 | Process for the hardening of photographic layers utilizing fast acting hardener and polysaccharide | Fritz Nittel, Karl Czernik, Wolfgang Sauerteig, Peter Bergthaller | 1980-11-11 |