Issued Patents All Time
Showing 126–150 of 151 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4952678 | Trisazo dyes | — | 1990-08-28 |
| 4943617 | Liquid crystalline copolymer | Bernd Hisgen | 1990-07-24 |
| 4940692 | Transfer of dyes | Volker Bach, Ruediger Sens, Manfred Ruske | 1990-07-10 |
| 4939118 | Transfer of azo dyes having a pyridine coupling component | Gunther Lamm, Hermann Loeffler, Helmut Reichelt, Ruediger Sens | 1990-07-03 |
| 4908041 | Navy and black dye mixtures: thiophene azo disperse dye and red, yellow or orange disperse dye | Erwin Hahn, Guenter Hansen, Helmut Reichelt, Ernst Schefczik, Helmut Degen +2 more | 1990-03-13 |
| 4904777 | Mono azo dyes containing as diazo radical a thiophene radical which possesses an oxime group | Guenter Hansen, Ernst Schefczik, Helmut Reichelt | 1990-02-27 |
| 4880769 | Transfer of catinic dyes in their deprotonated, electrically neutral form | Johannes P. Dix, Udo Mayer, Ruediger Sens | 1989-11-14 |
| 4865762 | Polymers which form liquid-crystalline phases | Willi Kreuder, Peter Neumann, Hans-Josef Sterzel, Helmut Ringsdorf | 1989-09-12 |
| 4843153 | Azo dyes containing thienothiophene radicals as radicals of the diazo component | Heinz Eilingsfeld, Guenter Hansen, Helmut Reichelt | 1989-06-27 |
| 4837269 | 2-aminothiophene radical substituted by an electron withdrawing group | Guenter Hansen, Ernst Schefczik, Helmut Reichelt | 1989-06-06 |
| 4814465 | Preparation of aminothiophene derivatives | — | 1989-03-21 |
| 4785116 | Aminoisothiazole compounds | Heinz Eilingsfeld | 1988-11-15 |
| 4760049 | Dye transfer | Ruediger Sens | 1988-07-26 |
| 4724259 | Azo dyes and liquid-crystalline materials containing these dyes | Werner Juenemann, Johannes Dehnert | 1988-02-09 |
| 4721779 | Trisazo dyes containing naphthalene or quinoline units and their use in liquid crystal materials | — | 1988-01-26 |
| 4702945 | Optical recording medium | Peter Neumann, Matthias Dust, Helmut Ringsdorf, Hans-Werner Schmidt, Guenter Baur +2 more | 1987-10-27 |
| 4681699 | Bisazo dyes and their use in liquid crystalline materials | — | 1987-07-21 |
| 4667020 | Aromatic disazo dyes and liquid-crystalline materials containing these dyes | Christos Vamvakaris | 1987-05-19 |
| 4667019 | Azo dyes containing a triazolyl group for use in liquid crystalline materials | Peter Neumann | 1987-05-19 |
| 4631328 | Polymers containing mesogenic groups and dye radicals in the side chains | Helmut Ringsdorf, Michael Portugall, Hans-Werner Schmidt | 1986-12-23 |
| 4556622 | Electrophotographic recording material whose photoconductor layer contains a halogenated perylene dye sensitizer | Peter Neumann, Gerhard Hoffmann | 1985-12-03 |
| 4533612 | Electrophotographic recording materials containing special charge carrier-transporting compounds | Heinz Eilingsfeld, Gerhard Hoffmann, Peter Neumann | 1985-08-06 |
| 4490541 | 5(3)-Aminopyrazolo-3,4(4,5)-dicarboximide azo dyestuff intermediates | Heinz Eilingsfeld | 1984-12-25 |
| 4466899 | Dyes for use in liquid crystal mixtures | Walter Ditter, Dieter Horn, Manfred Patsch, Heinz Eilingsfeld | 1984-08-21 |
| 4465857 | Phenylhydrazones | Peter Neumann, Heinz Eilingsfeld, Gerhard Hoffmann | 1984-08-14 |