Issued Patents All Time
Showing 1–21 of 21 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, Ingrid Muller, Dieter Ohlendorf | 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, Gerhard Illian, Ingrid Muller +3 more | 1997-01-14 |
| 5443754 | Pyridylpyrimidines, a process for their preparation and their use in liquid-crystalline mixtures | Claus Escher, Gerhard Illian, Rainer Wingen | 1995-08-22 |
| 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, Ingrid Muller, Dieter Ohlendorf +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 | Hans-Rolf Dubal, Claus Escher, Gerhard Illian, Yoshio Inoguchi, Ingrid Muller +3 more | 1995-01-24 |
| 5378394 | Ferroelectric liquid-crystalline mixtures | Hans-Rolf Dubal, Claus Escher, Takamasa Harada, Gerhard Illian, Ingrid Muller +3 more | 1995-01-03 |
| 5370823 | Pyrimidinecyclohexane derivatives, process for their preparation, and their use in liquid-crystalline mixtures | Gerhard Illian, Rainer Wingen | 1994-12-06 |
| 5360576 | Chiral alkenylaryl 2,3-epoxyalkyl ethers, and the use thereof in liquid-crystalline mixtures | Karsten Blatter, Claus Escher, Takamasa Harada, Peter Harnischfeger | 1994-11-01 |
| 5354500 | Optically active carboxylic esters of oxygen-containing heterocycles as doping substances in liquid crystal mixtures and liquid crystal mixtures containing them | Ingrid Muller, Hans-Rolf Dubal, Claus Escher, Gerhard Illian, Mikio Murakami +2 more | 1994-10-11 |
| 5348684 | Organosilylalkyl or organosilylalkenyl compounds, process for preparing them and their use in liquid-crystalline mixtures | Hans-Rolf Dubal, Claus Escher, Gerhard Illian, Yoshio Inoguchi, Ingrid Muller +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, Gerhard Illian, Mikio Murakami +2 more | 1994-07-12 |
| 5286409 | Liquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixtures | Hans-Rolf Dubal, Claus Escher, Takamasa Harada, Gerhard Illian, Ingrid Muller +3 more | 1994-02-15 |
| 5231528 | Ferroelectric liquid crystal components having high spontaneous polarization and low helical pitch | Claus Escher, Gerhard Illian, Takamasa Harada, Mikio Murakami | 1993-07-27 |
| 5071589 | Liquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixtures | Hans-Rolf Dubal, Claus Escher, Ingrid Muller, Dieter Ohlendorf, 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, Ingrid Muller +2 more | 1991-01-29 |
| 4985172 | Chiral aryloxypropionates, and the use thereof as dopes in liquid-crystal phases | Rainer Wingen, Hans-Rolf Dubal, Ingrid Muller, Dieter Ohlendorf | 1991-01-15 |
| 4906401 | Use of liquid-crystal 5-phenylpyrimidine derivatives as components of smectic liquid-crystal mixtures | Hans-Rolf Dubal, Claus Escher, Ingrid Muller, Dieter Ohlendorf, 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, Dieter Ohlendorf, Rainer Wingen | 1990-03-06 |
| 4891151 | Liquid-crystalline phenylpyrimidinyl cyclohexanecarboxylates having a smectic phase, a process for their preparation, and their use in liquid-crystal mixtures | Rainer Wingen, Hans-Rolf Dubal, Claus Escher, Ingrid Muller, Dieter Ohlendorf | 1990-01-02 |
| 4876028 | Chiral aryl-2,3-epoxyalkyl-ethers and the corresponding thio compounds thereof, and the use thereof as dopes in liquid-crystal phases | Hans-Rolf Dubal, Ingrid Muller, Dieter Ohlendorf, Rainer Wingen | 1989-10-24 |