Issued Patents All Time
Showing 1–25 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5651918 | Optically active 1,3-dioxolane derivatives carrying a mesogenic radical in the 4-position, a process for their preparation and their use as doping agents in liquid-crystal mixtures | Gunter Scherowsky, Jurgen Gay, Rainer Wingen, Hans-Rolf Dubal, Claus Escher +3 more | 1997-07-29 |
| 5641428 | Use of optically active 1,3-dioxolane-4-carboxylates as dopes in liquid-crystal mixtures, liquid-crystal mixtures containing these compounds, and novel optically active 1,3-dioxolane-4-carboxylates | Rainer Wingen, Hans-Rolf Dubal, Claus Escher, Wolfgang Hemmerling, Ingrid Muller | 1997-06-24 |
| 5594575 | Ferroelectric liquid-crystal systems having three or more chiral additives with different signs of the helical twist in the cholesteric phase | Claus Escher, Hans-Rolf Dubal, Takamasa Harada, Wolfgang Hemmerling, Gerhard Illian +3 more | 1997-01-14 |
| 5430564 | Process for producing ferroelectric liquid-crystal cells with oleophilic additive employing heat and low pressure overlapped a short time | Takamasa Harada, Claus Escher, Gerhard Illian, Heinz Rieger, Norbert Rosch | 1995-07-04 |
| 5407599 | Cyclopropylaklyl or -alkenyl or heterocyclic compounds, process for their preparation and their use in liquid-crystalline mixtures | Armin de Meijere, Hans-Rolf Dubal, Claus Escher, Wolfgang Hemmerling, Ingrid Muller +4 more | 1995-04-18 |
| 5384070 | Use of optically active tetrahydrofuran-2-carboxylic acid esters as dopants in liquid-crystal mixtures, liquid-crystal mixtures containing same and novel optically active tetrahydrofuran-2-carboxylic acid esters | Wolfgang Hemmerling, Hans-Rolf Dubal, Claus Escher, Gerhard Illian, Yoshio Inoguchi +3 more | 1995-01-24 |
| 5378394 | Ferroelectric liquid-crystalline mixtures | Hans-Rolf Dubal, Claus Escher, Takamasa Harada, Wolfgang Hemmerling, Gerhard Illian +3 more | 1995-01-03 |
| 5361152 | Process for producing ferroelectric liquid-crystal cells | Takamasa Harada, Claus Escher, Gerhard Illian, Heinz Rieger, Norbert Rosch | 1994-11-01 |
| 5356542 | Mixtures of organic ammonium salts and their use as flow accelerators | Manfred Hofinger, Detlef Wehle | 1994-10-18 |
| 5354500 | Optically active carboxylic esters of oxygen-containing heterocycles as doping substances in liquid crystal mixtures and liquid crystal mixtures containing them | Wolfgang Hemmerling, Ingrid Muller, Hans-Rolf Dubal, Claus Escher, Gerhard Illian +2 more | 1994-10-11 |
| 5353136 | Ferroelectric liquid crystal with positive dielectric anisotropy, chevron structure and grey scale | Claus Escher, Hans-Rolf Dubal, Takamasa Harada, Gerhard Illian, Mikio Murakami | 1994-10-04 |
| 5348684 | Organosilylalkyl or organosilylalkenyl compounds, process for preparing them and their use in liquid-crystalline mixtures | Wolfgang Hemmerling, Hans-Rolf Dubal, Claus Escher, Gerhard Illian, Yoshio Inoguchi +3 more | 1994-09-20 |
| 5328638 | Optically active esters of 5-ethyl- and 5-vinyl-1,3-dioxolane-4-carboxylic acid, their use as doping substances in liquid crystal mixtures and the liquid crystal mixtures containing the new esters | Ingrid Muller, Hans-Rolf Dubal, Claus Escher, Wolfgang Hemmerling, Gerhard Illian +2 more | 1994-07-12 |
| 5312553 | Mixtures of organic ammonium salts as flow accelerators | Manfred Hofinger, Detlef Wehle | 1994-05-17 |
| 5286409 | Liquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixtures | Hans-Rolf Dubal, Claus Escher, Takamasa Harada, Wolfgang Hemmerling, Gerhard Illian +3 more | 1994-02-15 |
| 5257122 | Ferroelectric liquid crystal display having gray steps or a continuous gray scale | Hans-Rolf Dubal, Claus Escher, Gerhard Illian, Mikio Murakami | 1993-10-26 |
| 5118538 | Electrically conductive polymers and their use as orienting layer in liquid-crystal switching and display elements | Claus Escher, Hans-Rolf Dubal, Michael Feldhues, Takamasa Harada, Gerhard Illian +3 more | 1992-06-02 |
| 5071589 | Liquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixtures | Hans-Rolf Dubal, Claus Escher, Wolfgang Hemmerling, Ingrid Muller, Rainer Wingen | 1991-12-10 |
| 4988459 | Use of optically active oxirane-2-carboxylic acid esters as dopants in liquid-crystal mixtures, liquid-crystal mixtures containing same and novel optically active oxirane-2-carboxylic acid esters | Gunter Scherowsky, Jurgen Gay, Hans-Rolf Dubal, Claus Escher, Wolfgang Hemmerling +2 more | 1991-01-29 |
| 4985172 | Chiral aryloxypropionates, and the use thereof as dopes in liquid-crystal phases | Rainer Wingen, Hans-Rolf Dubal, Wolfgang Hemmerling, Ingrid Muller | 1991-01-15 |
| 4968798 | Liquid-crystalline, 1-substituted piperidine-4-carboxylic acid esters | Dieter Gunther, Rainer Wingen | 1990-11-06 |
| 4927244 | Use of compounds or mixtures of compounds which have a chiral, orthogonal, more highly ordered smectic phase in the range of said phase as switching or indicating medium | Christian Bahr, Gerd Heppke, Detlef Lotzsch, Hans-Rolf Dubal, Claus Escher | 1990-05-22 |
| 4915868 | Optically active esters of 1-acylproline as dopes in liquid-crystal mixtures, and novel optically active esters of 1-acylproline | Dieter Gunther, Rainer Wingen | 1990-04-10 |
| 4906401 | Use of liquid-crystal 5-phenylpyrimidine derivatives as components of smectic liquid-crystal mixtures | Hans-Rolf Dubal, Claus Escher, Wolfgang Hemmerling, Ingrid Muller, Rainer Wingen | 1990-03-06 |
| 4906752 | Liquid-crystal 5-phenylpyrimidine derivatives having sc or sc* phases and a process for preparing them | Ingrid Muller, Hans-Rolf Dubal, Claus Escher, Wolfgang Hemmerling, Rainer Wingen | 1990-03-06 |