Inventor · disambiguated record
Hans-Rolf Dubal
Also filed as: DUEBAL HANS-ROLF · DÜBAL HANS-ROLF
38 granted patents·390 citations·filing 1987–2005
97Inventor score
Files withHOECHST AG25AVENTIS RES & TECH GMBH & CO4CLARIANT INT LTD4LI JI2AVENTIS RES & TECHNOLOGY DEUTS1
Top patents by PatentIndex Score
38 records- 0193US6482479B1Active matrix displays having high contrast valuesCLARIANT INT LTD·Filed 2000·Granted Nov 19, 2002·83 cites·7 claims
- 0285US4927244AUse 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 mediumHOECHST AG·Filed 1988·Granted May 22, 1990·22 cites·3 claims
- 0378US4988459AUse 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 estersHOECHST AG·Filed 1988·Granted Jan 29, 1991·14 cites·6 claims
- 0475US6958176B2Liquid crystal mixtureLI JI·Filed 2001·Granted Oct 25, 2005·16 cites·14 claims
- 0572US4906752ALiquid-crystal 5-phenylpyrimidine derivatives having sc or sc* phases and a process for preparing themHOECHST AG·Filed 1989·Granted Mar 6, 1990·9 cites·2 claims
- 0671US5384070AUse 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 estersHOECHST AG·Filed 1993·Granted Jan 24, 1995·26 cites·5 claims
- 0770US6793984B2Fluorinated (dihydro)phenanthrene derivatives, and their use in liquid-crystalline mediaMERCK PATENT BESCHRAENKTER HAF·Filed 2002·Granted Sep 21, 2004·7 cites·19 claims
- 0869US5407599ACyclopropylaklyl or -alkenyl or heterocyclic compounds, process for their preparation and their use in liquid-crystalline mixturesHOECHST AG·Filed 1993·Granted Apr 18, 1995·11 cites·19 claims
- 0968US4985172AChiral aryloxypropionates, and the use thereof as dopes in liquid-crystal phasesHOECHST AG·Filed 1987·Granted Jan 15, 1991·8 cites·9 claims
- 1066US9388338B2Liquid crystal mixtureLI JI·Filed 2005·Granted Jul 12, 2016·2 cites·30 claims
- 1163US5118538AElectrically conductive polymers and their use as orienting layer in liquid-crystal switching and display elementsHOECHST AG·Filed 1990·Granted Jun 2, 1992·20 cites·7 claims
- 1262US6824707B2Active matrix liquid crystal device and smectic liquid crystal mixtureCLARIANT INT LTD·Filed 2002·Granted Nov 30, 2004·7 cites·15 claims
- 1362US5257122AFerroelectric liquid crystal display having gray steps or a continuous gray scaleHOECHST AG·Filed 1990·Granted Oct 26, 1993·24 cites·6 claims
- 1458US5071589ALiquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixturesHOECHST AG·Filed 1988·Granted Dec 10, 1991·13 cites·29 claims
- 1558US4876028AChiral aryl-2,3-epoxyalkyl-ethers and the corresponding thio compounds thereof, and the use thereof as dopes in liquid-crystal phasesHOECHST AG·Filed 1987·Granted Oct 24, 1989·13 cites·10 claims
- 1657US6495220B2Disubstituted phenanthrenes and their use in liquid-crystal mixturesCLARIANT INT LTD·Filed 2001·Granted Dec 17, 2002·4 cites·7 claims
- 1757US4906401AUse of liquid-crystal 5-phenylpyrimidine derivatives as components of smectic liquid-crystal mixturesHOECHST AG·Filed 1989·Granted Mar 6, 1990·12 cites·5 claims
- 1851US5384168AFerroelectric liquid-crystal display of high contrast and brightnessHOECHST AG·Filed 1991·Granted Jan 24, 1995·17 cites·10 claims
- 1951US5166304AUse of polyaryl ether ketones as alignment layersHOECHST AG·Filed 1991·Granted Nov 24, 1992·11 cites·8 claims
- 2049US5353136AFerroelectric liquid crystal with positive dielectric anisotropy, chevron structure and grey scaleHOECHST AG·Filed 1990·Granted Oct 4, 1994·9 cites·4 claims
- 2148US5348684AOrganosilylalkyl or organosilylalkenyl compounds, process for preparing them and their use in liquid-crystalline mixturesHOECHST AG·Filed 1992·Granted Sep 20, 1994·9 cites·11 claims
- 2248US4891151ALiquid-crystalline phenylpyrimidinyl cyclohexanecarboxylates having a smectic phase, a process for their preparation, and their use in liquid-crystal mixturesHOECHST AG·Filed 1988·Granted Jan 2, 1990·2 cites·5 claims
- 2344US6704086B1Monostable ferroelectric active-matrix displayAVENTIS RES & TECH GMBH & CO·Filed 1999·Granted Mar 9, 2004·12 cites·5 claims
- 2441US6365238B1Chip card with bistable displayAVENTIS RES & TECH GMBH & CO·Filed 1998·Granted Apr 2, 2002·6 cites·2 claims
- 2539US7019811B1Smectic liquid crystal high-contrast control or display deviceCLARIANT INT LTD·Filed 2000·Granted Mar 28, 2006·0 cites·7 claims
- 2639US5651918AOptically 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 mixturesHOECHST AG·Filed 1995·Granted Jul 29, 1997·6 cites·6 claims
- 2736US6368679B1Ferroelectric liquid-crystal display having active matric elementsAVENTIS RES & TECH GMBH & CO·Filed 1998·Granted Apr 9, 2002·3 cites·3 claims
- 2835US5328638AOptically 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 estersHOECHST AG·Filed 1992·Granted Jul 12, 1994·3 cites·3 claims
- 2935US5286409ALiquid-crystalline mixtures, in particular ferroelectric liquid-crystalline mixturesHOECHST AG·Filed 1990·Granted Feb 15, 1994·3 cites·15 claims
- 3034US5378394AFerroelectric liquid-crystalline mixturesHOECHST AG·Filed 1990·Granted Jan 3, 1995·3 cites·9 claims
- 3133US5331081AUse of fluorinated aromatic polyamides as orientation layer for liquid-crystal switching and display devicesHOECHST AG·Filed 1990·Granted Jul 19, 1994·5 cites·10 claims
- 3232US6661494B1Monostable ferroelectric active matrix displayAVENTIS RES & TECH GMBH & CO·Filed 1999·Granted Dec 9, 2003·3 cites·10 claims
- 3331US5641428AUse 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-carboxylatesHOECHST AG·Filed 1992·Granted Jun 24, 1997·0 cites·6 claims
- 3431US5594575AFerroelectric liquid-crystal systems having three or more chiral additives with different signs of the helical twist in the cholesteric phaseHOECHST AG·Filed 1995·Granted Jan 14, 1997·1 cites·9 claims
- 3530US6746731B1Ferroelectric active matrix displays with wide operating temperature rangeCLARIANT GMBH·Filed 1999·Granted Jun 8, 2004·0 cites·12 claims
- 3630US5354500AOptically active carboxylic esters of oxygen-containing heterocycles as doping substances in liquid crystal mixtures and liquid crystal mixtures containing themHOECHST AG·Filed 1992·Granted Oct 11, 1994·0 cites·7 claims
- 3730US5196501ASubstituted aromatic polyamides as orientation layers for liquid crystal display elements and liquid crystal switching elementsHOECHST AG·Filed 1991·Granted Mar 23, 1993·2 cites·8 claims
- 3827US6549188B1Ferroelectric liquid-crystal display with wide range of working temperaturesAVENTIS RES & TECHNOLOGY DEUTS·Filed 1998·Granted Apr 15, 2003·4 cites·9 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →