Patents by Inventor Volker Reiffenrath

Volker Reiffenrath 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).

  • Liquid-crystalline medium and liquid-crystal display
    Patent number: 7442419
    Abstract: Disclosed are a liquid-crystalline medium, the use thereof for electro-optical purposes, and displays containing this medium, characterised in that the medium contains one or more compounds of formula I and one or more compounds selected from compounds of formulae K-1 to K-11, containing a CF2O bridge.
    Type: Grant
    Filed: March 9, 2007
    Date of Patent: October 28, 2008
    Assignee: Merck Patent GmbH
    Inventors: Harald Hirschmann, Martina Weidner, Michael Wittek, Volker Reiffenrath, Brigitte Schuler, Markus Czanta, Renate Bender
  • Liquid-Crystalline Medium and Liquid-Crystal Display Comprising 1,2-Difluoroethene Compounds
    Publication number: 20080260971
    Abstract: The present invention relates to a liquid-crystalline medium comprising 1,2-difluoroethene compounds of the general formula I, in which R1, ring A, Z1, Z2, m, X and L1-6 are as defined in claim 1. The invention also relates to the use of the medium for electro-optical purposes and to displays containing this medium. Novel 1,2-difluoroethene compounds having 3 or more rings are disclosed.
    Type: Application
    Filed: May 18, 2006
    Publication date: October 23, 2008
    Inventors: Michael Wittek, Markus Czanta, Harald Hirschmann, Volker Reiffenrath
  • Liquid-crystalline medium and liquid-crystal display
    Patent number: 7438956
    Abstract: Disclosed are liquid-crystalline medium, use thereof for electro-optical purposes, and displays containing this medium, wherein the medium contains one or more compounds of formula I and one or more compounds of formulae K-1 to K-11, containing a CF2O bridge.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: October 21, 2008
    Assignee: Merck Patent GmbH
    Inventors: Harald Hirschmann, Martina Weidner, Michael Wittek, Volker Reiffenrath, Brigitte Schuler, Markus Czanta, Renate Bender
  • Liquid-crystalline medium
    Patent number: 7419705
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds, characterized in that it comprises one or more compounds of the formula I in which R1, L1 and L2 are as defined in claim 1, and to the use thereof for electro-optical purposes, in particular TN monitor applications.
    Type: Grant
    Filed: May 14, 2004
    Date of Patent: September 2, 2008
    Assignee: Merck Patent GmbH
    Inventors: Michael Heckmeier, Volker Reiffenrath, Izumi Saito
  • Cyclobutane and Spiro[3.3]Heptane Compounds
    Publication number: 20080206490
    Abstract: The present invention relates to cyclobutane and spiro[3.3]heptane compounds, to a process for the preparation thereof, to the use thereof as components in liquid-crystalline media, and to electro-optical display elements which contain these liquid-crystalline media.
    Type: Application
    Filed: August 16, 2006
    Publication date: August 28, 2008
    Inventors: Volker Reiffenrath, Matthias Bremer, Melanie Klasen-Memmer
  • LIQUID-CRYSTALLINE MEDIUM
    Publication number: 20080199635
    Abstract: The invention relates to a liquid-crystalline medium, characterised in that it comprises one or more compounds of the formula I in which R0, L1, n, A and B have the meanings indicated in Claim 1, furthermore to novel compounds of the formula I, to processes for the preparation thereof, to the use thereof in electronic and electro-optical devices, in particular in LC displays, and to LC displays containing same.
    Type: Application
    Filed: February 1, 2008
    Publication date: August 21, 2008
    Inventors: Harald HIRSCHMANN, Michael Wittek, Markus Czanta, Volker Reiffenrath
  • Liquid-crystal medium containing monofluoroterphenyl compounds
    Patent number: 7390538
    Abstract: The present invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive or negative dielectric anisotropy which is characterised in that it comprises one or more compounds of the general formula I in which R1 and R2 are each, independently of one another, identically or differently, H, an alkyl radical having from 1 to 12 carbon atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —CH?CH—, —C?C—, —CO—, —CO—O, —O—CO— or —O—CO—O— in such a way that 0 atoms are not linked directly to one another, to the use thereof for electro-optical purposes, and to electro-optical display devices which contain this medium.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: June 24, 2008
    Assignee: Merck Patent GmbH
    Inventors: Atsutaka Manabe, Erdal Durmaz, Eike Poetsch, Volker Reiffenrath, Michael Heckmeier
  • Liquid-crystalline phenol esters
    Patent number: 7316830
    Abstract: The invention relates to liquid-crystalline phenol esters of the formula I in which R, A1, Z1, m, L and Y are as defined in Claim 1, to liquid-crystalline media comprising at least one phenol ester of the formula I, and to electro-optical displays containing such a liquid-crystalline medium.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: January 8, 2008
    Assignee: Merck Patent GmbH
    Inventors: Volker Reiffenrath, Michael Heckmeier, Eike Poetsch, Joachim Krause, Werner Binder, Brigitte Schuler, Achim Götz
  • LIQUID-CRYSTALLINE MEDIUM AND LIQUID-CRYSTAL DISPLAY
    Publication number: 20070228327
    Abstract: Disclosed are a liquid-crystalline medium, the use thereof for electro-optical purposes, and displays containing this medium, characterised in that the medium contains one or more compounds of formula I and one or more compounds selected from compounds of formulae K-1 to K-11, containing a CF2O bridge.
    Type: Application
    Filed: March 9, 2007
    Publication date: October 4, 2007
    Inventors: Harald Hirschmann, Martina Weidner, Michael Wittek, Volker Reiffenrath, Brigitte Schuler, Markus Czanta, Renate Bender
  • Liquid crystalline medium and liquid crystal display
    Publication number: 20070221880
    Abstract: A dielectrically positive liquid crystalline media comprising: a first dielectrically positive component, component A, comprising a dielectrically neutral compound of formula I wherein the parameters have the meanings defined herein; a second dielectrically positive component, component B, comprising one or more dielectrically positive compounds having a dielectric anisotropy of more than 3; and optionally a dielectrically neutral component, component C, comprising one or more dielectrically neutral compounds having a dielectric anisotropy in the range from ?1.5 to 3, are suitable for use in liquid crystal displays, especially active matrix displays, and in particular TN and to IPS displays.
    Type: Application
    Filed: March 16, 2007
    Publication date: September 27, 2007
    Inventors: Markus Czanta, Harald Hirschmann, Peer Kirsch, Volker Reiffenrath, Marcus Reuter, Christian Hock, Sayuri Ogiri, Shinji Nakajima
  • Liquid-crystalline medium and liquid-crystal display
    Publication number: 20070176146
    Abstract: Disclosed are liquid-crystalline medium, use thereof for electro-optical purposes, and displays containing this medium, wherein the medium contains one or more compounds of formula I and one or more compounds of formulae K-1 to K-11, containing a CF2O bridge.
    Type: Application
    Filed: November 28, 2006
    Publication date: August 2, 2007
    Inventors: Harald Hirschmann, Martina Weidner, Michael Wittek, Volker Reiffenrath, Brigitte Schuler, Markus Czanta, Renate Bender
  • Nematic liquid-crystal mixture, and displays containing same
    Patent number: 7220464
    Abstract: A nematic liquid-crystal mixture contains a compound of formula I in which R11 and R12 are as defined in the specification, and a liquid-crystal displays containing same.
    Type: Grant
    Filed: February 13, 2004
    Date of Patent: May 22, 2007
    Assignee: Merck Patent Gesellschaft
    Inventors: Harald Hirschmann, Volker Reiffenrath
  • Liquid-crystalline medium
    Patent number: 7201951
    Abstract: Described are media for liquid-crystal applications where the media include a mixture of polar compounds of positive dielectric anisotropy. The mixtures include one or more compounds of the formula I in which: R1 is a halogenated or unsubstituted alkyl or alkoxy radical having from 1 to 15 carbon atoms, where one or more CH2 groups in these radicals are optionally, independently of one another, replaced by —C?C—, —CH?CH—, —O—, —CO—O—or —O—CO— in such a way that O atoms are not linked directly to one another; X is F, Cl, CN, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having 1 to 6 carbon atoms; and L1 and L2 are each, independently of one another, H or F. It being provided that the media exhibit a TN threshold of below 1.3V.
    Type: Grant
    Filed: July 8, 2004
    Date of Patent: April 10, 2007
    Assignee: Merck Patent GmbH
    Inventors: Michael Heckmeier, Brigitte Schuler, Izumi Saito, Volker Reiffenrath, Georg Luessem, Christian Hock
  • Liquid-crystalline phenol esters
    Patent number: 7179511
    Abstract: The invention relates to liquid-crystalline phenol esters of the formula I in which R, A1, Z1, m, L and Y are as defined in Claim 1, to liquid-crystalline media comprising at least one phenol ester of the formula I, and to electro-optical displays containing such a liquid-crystalline medium.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: February 20, 2007
    Assignee: Merck Patent GmbH
    Inventors: Volker Reiffenrath, Michael Heckmeier, Eike Poetsch, Joachim Krause, Werner Binder, Brigitte Schuler, Achim Götz
  • Liquid-crystalline medium
    Publication number: 20070034830
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds, characterised in that it comprises one or more compounds of the formula I in which R1, L1 and L2 are as defined in Claim 1, and to the use thereof for electro-optical purposes, in particular TN monitor applications.
    Type: Application
    Filed: May 14, 2004
    Publication date: February 15, 2007
    Inventors: Michael Heckmeier, Volker Reiffenrath, Izumi Saito
  • Liquid-crystal composition, methods of adjusting the resistance, and substituted phenols
    Patent number: 7166337
    Abstract: The present invention relates to liquid-crystal mixtures having specific resistance values, comprising acidic compounds. The present invention furthermore relates to liquid-crystal displays containing these liquid-crystal mixtures. The invention furthermore relates to compounds of the formula I, in which the parameters are as defined in the text, to their preparation, and to their use for achieving certain specific resistance values in liquid-crystal mixtures. The application also relates to a method of adjusting the specific resistance of liquid-crystal mixtures using acidic compounds.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: January 23, 2007
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Michael Darius, Volker Reiffenrath, Kazuaki Tarumi, Bernhard Rieger, Michael Heckmeier, Marcus Reuter, Peer Kirsch
  • Liquid-crystal medium containing monofluoroterphenyl compounds
    Publication number: 20070001149
    Abstract: The present invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive or negative dielectric anisotropy which is characterised in that it comprises one or more compounds of the general formula I in which R1 and R2 are each, independently of one another, identically or differently, H, an alkyl radical having from 1 to 12 carbon atoms which is unsubstituted, monosubstituted by CN or CF3 or at least monosubstituted by halogen, where, in addition, one or more CH2 groups in these radicals may each, independently of one another, be replaced by —O—, —S—, —CH?CH—, —C?C—, —CO—, —CO—O—, —O—CO— or —O—CO—O— in such a way that O atoms are not linked directly to one another, to the use thereof for electro-optical purposes, and to electro-optical display devices which contain this medium.
    Type: Application
    Filed: June 23, 2004
    Publication date: January 4, 2007
    Inventors: Atsutaka Manabe, Erdal Durmaz, Eike Poetsch, Volker Reiffenrath, Michael Heckmeier
  • Liquid crystalline medium and liquid crystal display
    Patent number: 7153550
    Abstract: The instant invention relates to liquid crystalline media comprising a dielectrically positive component, component A, consisting of dielectrically positive compounds, comprising one or more compounds of formula I and one or more compounds of formula II wherein the parameters have the meaning given in the specification and to liquid crystal displays comprising these media, especially to active matrix displays.
    Type: Grant
    Filed: January 7, 2003
    Date of Patent: December 26, 2006
    Assignee: Merck Patent Gesellschaft
    Inventors: Michael Heckmeier, Sabine Schoen, Peer Kirsch, Matthias Bremer, Volker Reiffenrath
  • Liquid-crystalline phenol esters
    Publication number: 20060284139
    Abstract: The invention relates to liquid-crystalline phenol esters of the formula I in which R, A1, Z1, m, L and Y are as defined in Claim 1, to liquid-crystalline media comprising at least one phenol ester of the formula I, and to electro-optical displays containing such a liquid-crystalline medium.
    Type: Application
    Filed: August 24, 2006
    Publication date: December 21, 2006
    Inventors: Volker Reiffenrath, Michael Heckmeier, Eike Poetsch, Joachim Krause, Werner Binder, Brigitte Schuler, Achim Gotz
  • Compound having negative ??
    Patent number: 7122228
    Abstract: The invention relates to indanes having negative ?? of the formula Ia or Ib in which R, A, Z, X, Y, V, W, n and m are as defined in claim 1. The compounds are particularly suitable for producing VA-TFT displays.
    Type: Grant
    Filed: July 19, 2002
    Date of Patent: October 17, 2006
    Assignee: Merck Patent GmbH
    Inventors: Volker Reiffenrath, Michael Heckmeier, Matthias Bremer