Issued Patents All Time
Showing 26–50 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5272259 | Stilbene dyestuffs and light-polarizing films or sheets containing stilbene | Friedrich W. Krock | 1993-12-21 |
| 5213582 | Light-polarizing films or foils containing triphendioxazine or triphendithiazine dyes with good dichrditic properties | Peter Wild, Friedrich W. Krock | 1993-05-25 |
| 5201921 | Process for identifying plastics by addition of fluorescent dye | Klaus Luttermann, Aziz El Sayed, Reinhard Riess | 1993-04-13 |
| 5122557 | Light polarizing films or foils and dyes for their production | Friedrich W. Krock | 1992-06-16 |
| 5093401 | Aqueous casting solutions for the production of light-polarizing sheets or films based on polyvinyl alcohol | Friedrich W. Krock | 1992-03-03 |
| 5071524 | Process for the preparation of electrically conductive polyheteroaromatics | Udo Herrmann | 1991-12-10 |
| 5007942 | Light-polarizing films or sheets containing stilbene dyestuffs | Friedrich W. Krock | 1991-04-16 |
| 4985124 | Electrically conducting polyheteroaromatics and a process for their preparation | Udo Herrmann | 1991-01-15 |
| 4893911 | Polarizers based on polyacetylene, and the production thereof | Karl-Heinz Aleksander Ostoja-Starzewski, Josef Witte | 1990-01-16 |
| 4863634 | Anthraquinone dyestuffs | Rutger Neeff, Friedrich W. Krock | 1989-09-05 |
| 4770809 | Azo dyestuffs and liquid crystal material containing azo dyestuffs | Holger Heidenreich | 1988-09-13 |
| 4764622 | Light-collecting coumarin derivatives | Horst Harnisch | 1988-08-16 |
| 4689171 | Anthraquinone dyestuffs, their preparation and use and dichroic material containing these anthraquinone dyestuffs | Martin Blunck, Friedrich W. Krock, Rutger Neeff | 1987-08-25 |
| 4629637 | Coated optically isotropic or monoaxially film of plastic | Werner Waldenrath, Hans-Leo Weber | 1986-12-16 |
| 4614634 | Process for the production of plastic films having improved optical properties | Hans-Leo Weber, Hellmut Hannes | 1986-09-30 |
| 4610803 | Azo dyestuffs and liquid-crystal material containing azo dyestuffs | — | 1986-09-09 |
| 4596666 | Aryl-mercapto anthraquinone dyestuffs, their preparation and use and dichroic material containing aryl-mercapto anthraquinone dyestuffs | Martin Blunck, Friedrich W. Krock, Rutger Neeff | 1986-06-24 |
| 4544583 | Birefringence-free plastics | Hellmut Hannes, Hans-Leo Weber | 1985-10-01 |
| 4544496 | Light-collecting system using coumarin derivatives as energy converters | Horst Harnisch | 1985-10-01 |
| 4542074 | Surface metallized semiconductors | Kirkor Sirinyan, Rudolf Merten, Gerhard D. Wolf, Henning Giesecke, Harold Ebneth | 1985-09-17 |
| 4526705 | Light-collecting systems and the use of coumarin derivatives as energy converters in them | Frank Arndt, Horst Harnisch, Carl-Wolfgang Schellhammer | 1985-07-02 |
| 4519935 | Liquid-crystalline material containing azo dyestuffs | — | 1985-05-28 |
| 4492778 | Method for making fluorescent light-collectors | Josef Merten, Harry Rohr, Bernd Melchior | 1985-01-08 |
| 4492648 | Light-collecting systems using halogenated perylene derivatives as light converters | — | 1985-01-08 |
| 4472458 | Process for the production of metallized semiconductors | Kirkor Sirinyan, Rudolf Merten, Gerhard D. Wolf, Henning Giesecke, Harold Ebneth | 1984-09-18 |