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
    Publication number: 20100327226
    Abstract: The present invention relates to dielectrically positive liquid-crystalline media comprising one or more compounds of the formula I in which the parameters have the meaning indicated in the specification, and optionally one or more compounds selected from the group of the compounds of the formulae II and III in which the parameters have the meaning indicated in the specification, and optionally one or more compounds of the formula IV in which the parameters have the meaning indicated in the specification, and to liquid-crystal displays containing these media, especially to active-matrix displays and in particular to TN, IPS and FFS displays.
    Type: Application
    Filed: January 27, 2009
    Publication date: December 30, 2010
    Applicant: Merck Patent GmbH
    Inventors: Markus Czanta, Harald Hirschmann, Michael Wittek, Volker Reiffenrath, Renate Bender, Christian Hock, Brigitte Schuler
  • LIQUID-CRYSTLLINE MEDIUM AND LIQUID-CRYSTAL DISPLAY
    Publication number: 20100308267
    Abstract: The present invention relates to dielectrically positive liquid-crystalline media comprising a dielectrically neutral or slightly positive component, component A, comprising one or more dielectrically neutral or slightly positive compounds of the formula I in which the parameters have the meaning indicated in the specification, and a dielectrically positive component, component B, comprising one or more dielectrically positive compounds, and optionally a second dielectrically neutral component, component C, and to liquid-crystal displays containing these media, especially active-matrix displays and in particular TN, IPS and FFS displays.
    Type: Application
    Filed: January 15, 2009
    Publication date: December 9, 2010
    Applicant: Merck Patent GmbH
    Inventors: Michael Wittek, Brigitte Schuler, Volker Reiffenrath
  • Liquid-crystalline medium
    Patent number: 7807236
    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: Grant
    Filed: February 1, 2008
    Date of Patent: October 5, 2010
    Assignee: Merck Patent Gesellschaft
    Inventors: Harald Hirschmann, Michael Wittek, Markus Czanta, Volker Reiffenrath
  • LIQUID-CRYSTALLINE MEDIUM AND LIQUID-CRYSTAL DISPLAY
    Publication number: 20100243956
    Abstract: The present invention relates to dielectrically positive liquid-crystalline media comprising a dielectrically positive component, component A, comprising a dielectrically positive compound of the formula (I), in which the parameters have the meaning indicated in the specification, and optionally a second dielectrically positive component, component B, comprising one or more dielectrically positive compounds having a dielectric anisotropy of greater than 3 and optionally a dielectrically neutral component, component C, and to liquid-crystal displays, especially to active-matrix displays and in particular to TN, IPS, FFS and OCB displays, containing these media.
    Type: Application
    Filed: September 9, 2008
    Publication date: September 30, 2010
    Applicant: MERCK PATENT GESELLSCHAFT MIT BESCHRANKTER HAFTUNG
    Inventors: Michael Wittek, Brigitte Schuler, Volker Reiffenrath, Atsutaka Manabe, Elisabeth Meyer, Mark Goebel
  • Chiral phenol derivative, liquid crystal medium containing said chiral phenol derivative
    Patent number: 7790929
    Abstract: The invention relates to chiral phenols, preferably of formula (I), the different parameters having the meaning indicated in the description, liquid crystal media which contain said compounds as chiral doping agents and/or stabilizers, and the use thereof in electro-optical displays.
    Type: Grant
    Filed: September 18, 2003
    Date of Patent: September 7, 2010
    Assignee: Merck Patent GmbH
    Inventors: Volker Reiffenrath, Michael Heckmeier
  • Liquid-crystalline mixtures and liquid-crystal displays
    Patent number: 7785678
    Abstract: The present invention relates to liquid-crystalline mixtures and to novel compounds therefor, and to the use thereof in nematic liquid-crystal displays having positive dielectric anisotropy, such as, for example, STN or IPS displays, which are characterised in that they comprise one or more compounds of the formula (I) in which R1, A1, A2, Z1, Z2, n are as defined in claim (1).
    Type: Grant
    Filed: March 21, 2007
    Date of Patent: August 31, 2010
    Assignee: Merck Patent GmbH
    Inventors: Michael Junge, Ursula Patwal, Volker Reiffenrath
  • Liquid-crystalline medium
    Patent number: 7785677
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds which comprises at least one compound of the formula (I) in which R11, R12 and Z1 have the meanings indicated in Claim 1, and to the use thereof for an active-matrix display based on the ECB, FFS or IPS effect.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: August 31, 2010
    Assignee: Merck Patent GmbH
    Inventors: Melanie Klasen-Memmer, Volker Reiffenrath
  • Cyclobutane and spiro[3.3]heptane compounds
    Patent number: 7744968
    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: Grant
    Filed: August 16, 2006
    Date of Patent: June 29, 2010
    Assignee: Merck Patent GmbH
    Inventors: Volker Reiffenrath, Matthias Bremer, Melanie Klasen-Memmer
  • Liquid crystalline medium and liquid crystal display
    Patent number: 7740918
    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: Grant
    Filed: March 16, 2009
    Date of Patent: June 22, 2010
    Assignee: Merck Patent GmbH
    Inventors: Markus Czanta, Harald Hirschmann, Peer Kirsch, Volker Reiffenrath, Marcus Reuter, Christian Hock, Sayuri Ogiri, Shinji Nakajima
  • LIQUID-CRYSTALLINE MEDIUM AND LIQUID-CRYSTAL DISPLAY COMPRISING 1,2-DIFLUOROETHENE COMPOUNDS
    Publication number: 20100085529
    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: December 4, 2009
    Publication date: April 8, 2010
    Inventors: Michael Wittek, Markus Czanta, Harald Hirschmann, Volker Reiffenrath
  • Liquid crystalline medium
    Patent number: 7658978
    Abstract: The invention relates to a liquid crystalline medium containing one or more compounds of formula I, wherein R1 and R2 have the meanings described in claim 1, to its use for electrooptical purposes, and to displays containing this medium.
    Type: Grant
    Filed: July 16, 2007
    Date of Patent: February 9, 2010
    Assignee: Merck Patent Gesellschaft
    Inventors: Harald Hirschmann, Volker Reiffenrath
  • LIQUID-CRYSTALLINE MEDIUM
    Publication number: 20100026953
    Abstract: The invention relates to a liquid-crystalline medium comprising one or more compounds of the formula I in which R0 and X0 have the meanings indicated in Claim 1, and to the use thereof in electro-optical liquid-crystal displays.
    Type: Application
    Filed: August 29, 2007
    Publication date: February 4, 2010
    Inventors: Harald Hirschmann, Christian Hock, Martina Weidner, Volker Reiffenrath
  • Liquid-crystalline medium and liquid-crystal display comprising 1,2-difluoroethene compounds
    Patent number: 7651742
    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: Grant
    Filed: May 18, 2006
    Date of Patent: January 26, 2010
    Assignee: Merck Patent GmbH
    Inventors: Michael Wittek, Markus Czanta, Harald Hirschmann, Volker Reiffenrath
  • LIQUID-CRYSTALLINE MEDIUM
    Publication number: 20090309066
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of dielectrically negative, polar compounds which comprises at least one compound of the formula I in which the parameters have the meanings indicated in claim 1, to the use thereof in an electro-optical display, particularly in an active-matrix display based on the VA, ECB, PALC, FFS or IPS effect, and to displays of this type.
    Type: Application
    Filed: July 17, 2007
    Publication date: December 17, 2009
    Inventors: Melanie Klasen-Memmer, Georg Bernatz, Izumi Saito, Matthias Bremer, Lars Lietzau, Volker Reiffenrath
  • Liquid Crystalline Medium
    Publication number: 20090230354
    Abstract: The invention relates to a liquid crystalline medium containing one or more compounds of formula I, wherein R1 and R2 have the meanings described in claim 1, to its use for electrooptical purposes, and to displays containing this medium.
    Type: Application
    Filed: July 16, 2007
    Publication date: September 17, 2009
    Inventors: Harald Hirschmann, Volker Reiffenrath
  • LIQUID-CRYSTALLINE MIXTURES AND LIQUID-CRYSTAL DISPLAYS
    Publication number: 20090201457
    Abstract: The present invention relates to liquid-crystalline mixtures and to novel compounds therefor, and to the use thereof in nematic liquid-crystal displays having positive dielectric anisotropy, such as, for example, STN or IPS displays, which are characterised in that they comprise one or more compounds of the formula (I) in which R1, A1, A2, Z1, Z2, n are as defined in Claim (1).
    Type: Application
    Filed: March 21, 2007
    Publication date: August 13, 2009
    Inventors: Michael Junge, Ursula Patwal, Volker Reiffenrath
  • LIQUID CRYSTALLINE MEDIUM AND LIQUID CRYSTAL DISPLAY
    Publication number: 20090184291
    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, 2009
    Publication date: July 23, 2009
    Inventors: Markus Czanta, Harald Hirschmann, Peer Kirsch, Volker Reiffenrath, Marcus Reuter, Christian Hock, Sayuri Ogiri, Shinji Nakajima
  • Liquid crystalline medium and liquid crystal display
    Patent number: 7563491
    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: Grant
    Filed: March 16, 2007
    Date of Patent: July 21, 2009
    Assignee: Merck Patent GmbH
    Inventors: Markus Czanta, Harald Hirschmann, Peer Kirsch, Volker Reiffenrath, Marcus Reuter, Christian Hock, Sayuri Ogiri, Shinji Nakajima
  • Liquid-Crystalline Medium
    Publication number: 20080315157
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds which comprises at least one compound of the formula (I) in which R11, R12 and Z1 have the meanings indicated in Claim 1, and to the use thereof for an active-matrix display based on the ECB, FFS or IPS effect.
    Type: Application
    Filed: December 8, 2006
    Publication date: December 25, 2008
    Applicant: MERCK PATENT GESELLSCHAFT
    Inventors: Melanie Klasen-Memmer, Volker Reiffenrath
  • Chiral dopants having a laterally alkylated phenyl structural element
    Patent number: 7462297
    Abstract: The present invention relates to chiral dopants having a laterally alkylated phenyl unit of the general formula I: in which Q*, R, A, Z, V, W, X, Y and n are as defined in claim 1, to the use thereof as components in liquid-crystalline mixtures, and to liquid-crystal and electro-optical display elements which contain the liquid-crystalline mixtures according to the invention.
    Type: Grant
    Filed: September 23, 2003
    Date of Patent: December 9, 2008
    Assignee: Merck Patent GmbH
    Inventors: Volker Reiffenrath, Michael Heckmeier