Patents by Inventor Hans-Rolf Dübal
Hans-Rolf Dübal has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9388338Abstract: Liquid crystal mixture comprising one or several compounds of formula (I) wherein R1, R2, R3, R4, R5, R6, M1, M2, X, A, and m are defined herein.Type: GrantFiled: August 11, 2005Date of Patent: July 12, 2016Assignee: Merck Patent GmbHInventors: Ji Li, Toshiaki Nonaka, Ayako Ogawa, Hans-Rolf Dübal, Barbara Hornung, Wolfgang Schmidt, Rainer Wingen
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Patent number: 9260662Abstract: Liquid crystal mixture comprising one or several compounds of formula (I) wherein R1, R2, R3, R4, R5, R6, M1, M2, X, A, and m are defined herein.Type: GrantFiled: August 11, 2005Date of Patent: February 16, 2016Assignee: Merck Patent GmbHInventors: Ji Li, Toshiaki Nonaka, Ayako Ogawa, Hans-Rolf Dübal, Barbara Hornung, Wolfgang Schmidt, Rainer Wingen
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Patent number: 7019811Abstract: The liquid-crystal switching or display device comprises a chiral smectic liquid-crystal mixture, where the ratio ?/? of the angle between the rubbing direction and the smectic layer normal to the tilt angle in the liquid-crystal mixture is at least 0.41. Preferably, the liquid-crystal mixture has the phase sequence I-N-C and the tilt angle ? at 25° C. is between 19° and 39°.Type: GrantFiled: July 24, 2000Date of Patent: March 28, 2006Assignee: Clariant International, Ltd.Inventors: Hans-Rolf Dübal, Barbara Hornung, Toshiaki Nonaka
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Patent number: 6958176Abstract: Liquid crystal mixture comprising compounds of formula (I) wherein R1: is H or a linear or branched alkyl group or branched alkenyl group R2: stands for a) H or F b) a linear or branched alkyl group or a linear or branched alkenyl group c) a radical wherein R3, R4, R5, R6: are an alkyl group M1, M2: represent independently from another a single bond, —OC(?O), —C(?O)O—, —OCH2—, —NH— A: is a) a linear or branched alkan-?,?-diylgroup or alkene-?,?-diyl group b) the group —C(?Y)— wherein Y is CH-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogenatoms, alkyl or alkyloxy groups, c) the group —CHY wherein Y is CH2-Z with Z being phenylen-1,4-diyl, optionally substituted by one to three halogenatoms, alkyl or alkyloxy groups d) a group wherein p, q are 0, 1 or 2; M3 is a single bond or —OC(?O)—, —C(?O)O—, —OCH2—, —CH2O—, —C?C—, —CH2CH2—, —CH2CH2CH2CH2— the radicals are phenylen-1,4-diyl, X is H, OH, a linear or branched alkyl or alkyloxy group, m: is 0 or 1 X and M1-(AType: GrantFiled: August 25, 2001Date of Patent: October 25, 2005Inventors: Ji Li, Toshiaki Nonaka, Ayako Ogawa, Hans-Rolf Dübal, Barbara Hornung, Wolfgang Schmidt, Rainer Wingen
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Patent number: 6929834Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of negative dielectric anisotropy which comprises at least one compound of the formula I in which R11 and R12, ring A, Z, a, L1 and L2 are as defined in claim 1, and the use thereof for an active-matrix display based on the ECB effect.Type: GrantFiled: September 25, 2001Date of Patent: August 16, 2005Assignee: Merck Patent GmbHInventors: Melaine Klasen-Memmer, Clarissa Weller, Matthias Bremer, Detlef Pauluth, Hans-Rolf Duebal, Barbara Hornung, Wolfgang Schmidt, Rainer Wingen
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Patent number: 6824707Abstract: A smectic liquid crystal mixture comprising a smectic liquid crystal base mixture and at least one dopant, which is either a complex ligand or an organic material, in a concentration of 0.01 to 5.0 weight percent.Type: GrantFiled: October 16, 2002Date of Patent: November 30, 2004Assignee: Clariant International Ltd.Inventors: Haruki Amakawa, Toshiaki Nonaka, Hans-Rolf Dübal, Rainer Wingen
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Patent number: 6793984Abstract: The invention relates to liquid-crystalline (dihydro)phenanthrene derivatives of the formula I in which R, G, A1, Z1, m, L1, L2, L3, L4, L5 and Y are as defined in claim 1, and to liquid-crystalline media comprising at least one (dihydro)phenanthrene derivative of the formula I, and to electro-optical displays containing a liquid-crystalline medium of this type.Type: GrantFiled: June 7, 2002Date of Patent: September 21, 2004Assignee: Merck Patent Beschraenkter HaftungInventors: Matthias Bremer, Detlef Pauluth, Michael Heckmeier, Hans-Rolf Dübal, Barbara Hornung, Wolfgang Schmidt, Rainer Wingen
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Patent number: 6746731Abstract: The active-matrix display contains a chiral smectic liquid-crystal mixture comprising at least one compound of the formula (I) R1—(A1—M1)a—(A2—M2)b—A3—X—B1—(B2)c—R2 (I). where the symbols are as defined in the description.Type: GrantFiled: September 24, 2001Date of Patent: June 8, 2004Assignee: Clariant GmbHInventors: Toshiaki Nonaka, Hans-Rolf Dübal, Rainer Wingen
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Publication number: 20040099842Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of negative dielectric anisotropy which comprises at least one compound of the formula I 1Type: ApplicationFiled: December 8, 2003Publication date: May 27, 2004Inventors: Melanie Klasen-Memmer, Clarissa Weller, Matthias Bremmer, Detlef Pauluth, Hans-Rolf Duebal, Barbara Hornung, Wolfgang Schmidt, Rainer Wingen
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Patent number: 6704086Abstract: The monostable ferroelectric active matrix display contains a liquid crystal layer in from of a monodomain with an unambiguously defined direction of the normal z to the layer of the smC* phase and is characterized by the fact that the normal z to the layer and the preferential direction n of the nematic or cholesteric phase (N* phase) form an angle of more than 5°.Type: GrantFiled: March 6, 2001Date of Patent: March 9, 2004Assignee: Aventis Research & Technologies GmbH & Co. KGInventors: Hans-Rolf Dübal, Rainer Wingen, Toshiaki Nonaka
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Patent number: 6661494Abstract: The monostable ferroelectric active matrix display comprises a liquid-crystal layer in the form of a monodomain having an unambiguously defined direction of the layer normal z of the smC* phase, the liquid-crystal layer preferably having a chevron C-1, chevron C-2 or bookshelf geometry.Type: GrantFiled: March 9, 2001Date of Patent: December 9, 2003Assignee: Aventis Research & Technologies GmbH & Co. KGInventors: Hans-Rolf Dübal, Rainer Wingen, Toshiaki Nonaka
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Patent number: 6549188Abstract: Ferroelectric liquid-crystal display having a broad operating temperature range. A ferroelectric liquid-crystal display containing a ferroelectric liquid-crystal mixture which is addressed with voltage pulses≧0.9 ms. The display according to the invention is particularly suitable for applications in which the length of the response time is not critical. Such displays can be operated with the same voltage over a broad temperature range; adjustment of the voltage as a function of temperature is not necessary. Examples of preferred applications are displays in chip cards, electronic price and display signs (shelf labels), PDAs (personal digital assistants) and pagers.Type: GrantFiled: June 15, 2000Date of Patent: April 15, 2003Assignee: Aventis Research & Technology Deutschland GmbH & Co.KGInventors: Ayako Takeichi, Barbara Hornung, Hans-Rolf Dübal
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Patent number: 6495220Abstract: Compounds of the formula (I) R1—A—Z1 (I) in which: R1 is an alkyl radical having 1 to 8 carbon atoms or an alkenyl radical having 2 to 8 carbon atoms, where, in each case, one (nonterminal) —CH2— group may also be replaced by —O— or —C(═O)O— and/or one or more H may be replaced by F A is phenanthrene-2,7-diyl or 9,10-dihydrophenanthrene-2,7-diyl Z1 is F, OCHxF3−x or CHxF3−x, where, in each case, x is 0, 1 or 2, OC2HzF5−z or C2HzF5−z, where, in each case, z is 0, 1, 2, 3 or 4, CH═CF2 or Cl, with the proviso that 2-fluoro-7-methoxy-phenanthrene is excluded.Type: GrantFiled: January 17, 2001Date of Patent: December 17, 2002Assignee: Clariant International Ltd.Inventors: Hans-Rolf Dübal, Barbara Hornung, Wolfgang Schmidt, Rainer Wingen
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Patent number: 6482479Abstract: An active matrix display comprises a chiral smectic liquid crystal mixture which has the phase sequence I—N*—SmC*, a spontaneous polarization in the operating temperature range of <40 nC/cm2 and a pitch of >10 &mgr;m at at least one temperature in the nematic or cholesteric phase and comprises at least one compound each from at least two of the substance classes (A), (B) and (C) and one or more compounds from substance class (D): (A): compounds comprising two rings which are directly linked to one another and are selected from phenylene-1,4-diyl, pyrimidine-2,5-diyl, pyridine-2,5-diyl and pyridazine-2,5-diyl with the proviso that at least one of these rings is a nitrogen heterocycle; (B): compounds comprising three rings selected from phenylene-1,4-diyl, two of the rings being directly linked to one another and the third ring being linked to one of the other two rings via an —OC(═O)— or —C(═O)—group, with the proviso that at least one of the three rings isType: GrantFiled: July 26, 2000Date of Patent: November 19, 2002Assignee: Clariant International Ltd.Inventors: Hans-Rolf Dübal, Toshiaki Nonaka, Rainer Wingen
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Patent number: 6368679Abstract: A ferroelectric active-matrix liquid-crystal display containing a ferroelectric liquid crystal which forms a ‘spontaneous bookshelf’ geometry.Type: GrantFiled: May 1, 2000Date of Patent: April 9, 2002Assignee: Aventis Research & Technologies GmbH & Co. KGInventors: Wolfgang Schmidt, Hans-Rolf Dübal
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Patent number: 6365238Abstract: The present invention describes a chip card having a ferroelectric liquid-crystal display containing a ferroelectric liquid-crystal layer, in which the liquid-crystal layer consists of a mixture of low-molecular-weight (60 to 95% by weight) and polymeric or oligomeric liquid crystals.Type: GrantFiled: January 21, 2000Date of Patent: April 2, 2002Assignee: Aventis Research & Technologies GmbHInventor: Hans-Rolf Dübal