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
    Publication number: 20040256604
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it comprises one or more compounds of the formula I 1
    Type: Application
    Filed: July 8, 2004
    Publication date: December 23, 2004
    Inventors: Michael Heckmeier, Brigitte Schuler, Izumi Saito, Volker Reiffenrath, Georg Luessem, Christian Hock
  • Liquid-crystalline medium
    Publication number: 20040256600
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it comprises one or more compounds of the formula I 1
    Type: Application
    Filed: July 8, 2004
    Publication date: December 23, 2004
    Inventors: Michael Heckmeier, Brigitte Schuler, Izumi Saito, Volker Reiffenrath, Georg Luessem, Christian Hock
  • Liquid-crystalline medium
    Publication number: 20040251447
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula I 1
    Type: Application
    Filed: July 2, 2004
    Publication date: December 16, 2004
    Inventors: Michael Heckmeier, Brigitte Schuler, Kazuaki Tarumi, Peer Kirsch, Volker Reiffenrath
  • Liquid-crystalline medium
    Publication number: 20040245501
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula I 1
    Type: Application
    Filed: July 2, 2004
    Publication date: December 9, 2004
    Inventors: Michael Heckmeier, Brigitte Schuler, Kazuaki Tarumi, Peer Kirsch, Volker Reiffenrath
  • Liquid-crystalline medium
    Publication number: 20040245502
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it comprises one or more compounds of the formula I 1
    Type: Application
    Filed: July 8, 2004
    Publication date: December 9, 2004
    Inventors: Michael Heckmeier, Brigitte Schuler, Izumi Saito, Volker Reiffenrath, Georg Luessem, Christian Hock
  • Liquid crystalline medium
    Patent number: 6827989
    Abstract: The invention relates to a liquid-crystalline medium with positive dielectric anisotropy and high optical anisotropy, characterized in that it contains one or more biphenyl derivatives comprising a terminal alkenyl group, and its use in electrooptical displays and projection systems, in particular reflective displays and displays based on a birefringence effect, such as OCB displays.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: December 7, 2004
    Assignee: Merck Patent GmbH
    Inventors: Atsutaka Manabe, Volker Reiffenrath
  • Liquid-crystalline medium
    Patent number: 6827990
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, 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.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: December 7, 2004
    Assignee: Merck Patent GmbH
    Inventors: Michael Heckmeier, Brigitte Schuler, Izumi Saito, Volker Reiffenrath, Georg Luessem, Christian Hock
  • Liquid-crystalline mixtures
    Patent number: 6821582
    Abstract: A liquid-crystalline mixture that contains one or more compounds of each of the formulae IA, IB and IC and to the use thereof in TN, STN and IPS displays.
    Type: Grant
    Filed: July 26, 2002
    Date of Patent: November 23, 2004
    Assignee: Merck Patent GmbH
    Inventors: Harald Hirschmann, Volker Reiffenrath, Marcus Reuter, Sabine Schoen, Sven Schüpfer, Clarissa Weller
  • Liquid-crystalline medium having a high birefringence and improved UV stability
    Patent number: 6808764
    Abstract: A liquid-crystalline medium comprises the compound of the formula (I): generally in amounts from 1 to 30% by weight, preferably from 2 to 20% by weight, particularly preferably from 3 to 10% by weight, and further liquid-crystalline compounds.
    Type: Grant
    Filed: February 5, 2003
    Date of Patent: October 26, 2004
    Assignee: Merck Patent GmbH
    Inventors: Michael Heckmeier, Volker Reiffenrath
  • Liquid crystal medium
    Patent number: 6793983
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula I and at least one compound of the formula in which the substituents are as defined in claim 1.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: September 21, 2004
    Assignee: Merck Patent GmbH
    Inventors: Michael Heckmeier, Brigitte Schuler, Kazuaki Tarumi, Peer Kirsch, Volker Reiffenrath
  • Liquid-crystalline medium
    Patent number: 6790489
    Abstract: 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, R12, A1, Z1, ring A and m are as defined in claim 1, and to the use thereof for an active matrix display based on the ECB or IPS effect.
    Type: Grant
    Filed: September 16, 2003
    Date of Patent: September 14, 2004
    Assignee: Merck Patent GmbH
    Inventors: Melanie Klasen-Memmer, Eike Poetsch, Volker Reiffenrath
  • Indane compounds having negative dielectric anisotropy
    Publication number: 20040171866
    Abstract: The invention relates to indanes having negative &Dgr;&egr; of the formula Ia or Ib 1
    Type: Application
    Filed: January 20, 2004
    Publication date: September 2, 2004
    Inventors: Volker Reiffenrath, Michael Heckmeier, Matthias Bremer
  • Nematic liquid-crystal mixture, and displays containing same
    Publication number: 20040161550
    Abstract: A nematic liquid-crystal mixture contains a compound of formula I 1
    Type: Application
    Filed: February 13, 2004
    Publication date: August 19, 2004
    Inventors: Harald Hirschmann, Volker Reiffenrath
  • Liquid crystalline medium and liquid crystal display
    Patent number: 6761939
    Abstract: Liquid crystalline media comprising a dielectrically positive component, component A, containing dielectrically positive compounds, comprising one or more compounds of formula I and one or more compounds of formula II and one or more dielectrically neutral compounds of formula IVb wherein the parameters have the meaning defined therein; and wherein two of the 6-membered rings in formula IVb may optionally be linked by an group selected from —CH2—CH2—, —CF2—CF2—, —CF2—O—, —O—CF2— and —CO—O— are sutiable for use in liquid crystal displays, especially active matrix displays.
    Type: Grant
    Filed: October 23, 2002
    Date of Patent: July 13, 2004
    Assignee: Merck Patent GmbH
    Inventors: Atsutaka Manabe, Elena Kress, Volker Reiffenrath
  • Electro-optical liquid-crystal display and liquid-crystal medium
    Patent number: 6761938
    Abstract: A liquid-crystalline medium of positive dielectric anisotropy suitable for use in an electro-optical liquid-crystal display having a realignment layer, for realigning the liquid crystals, whose field has a component parallel to the liquid-crystal layer which is crucial for the realignment, comprises at least one mesogenic compound and at least one compound of the formula I in which the substituents are as defined herein.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: July 13, 2004
    Assignee: Merck Patent GmbH
    Inventors: Michael Heckmeier, Marcus Reuter, Volker Reiffenrath
  • Liquid-crystalline medium
    Patent number: 6740369
    Abstract: Liquid-crystalline mediums based on a mixture of polar compounds of negative dielectric anisotropy, comprising one or more compounds of the general formula I, in which R11 is an alkyl group having from 1 to 12 carbon atoms or an alkenyl group having from 2 to 12 carbon atoms, and R12 is an alkenyl group having from 2 to 12 carbon atoms, are useful for electro-optical display elements such as active matrix addressed displays which operate on the ECB and/or VA principles.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: May 25, 2004
    Assignee: Merck Patent GmbH
    Inventors: Melanie Klasen-Memmer, Malgorzata Rillich, Volker Reiffenrath
  • Liquid-crystalline medium
    Publication number: 20040094748
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula I 1
    Type: Application
    Filed: August 6, 2003
    Publication date: May 20, 2004
    Inventors: Kazuaki Tarumi, Brigitte Schuler, Eike Poetsch, Volker Reiffenrath, Yukiomi Tanaka
  • Liquid-crystalline medium
    Publication number: 20040058158
    Abstract: 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 1
    Type: Application
    Filed: September 16, 2003
    Publication date: March 25, 2004
    Applicant: Merck Patent GmbH
    Inventors: Melanie Klasen-Memmer, Eike Poetsch, Volker Reiffenrath
  • Liquid-crystalline medium
    Patent number: 6689291
    Abstract: A liquid-crystalline medium based on a mixture of polar compound shaving positive dielectric anisotropy, characterized in that it contains one or more fluorophenylcyclohexene derivatives of the formula I in which R is H, an unsubstituted alkyl or alkenyl radical having up to 18 carbon atoms, in which one or more non-adjacent CH2 groups are optionally replaced by —O—, —S—, —CO—, —O—CO—, —CO—O— or —C≡C—, X is CN or Q—Y, Y is H, F or Cl, Q is —CF2—, —CHF—, —OCF2—, —OCHF—, —OCH2CF2—, —CH═CF—, —CF═CH—, —CF═CF—, —O—CF═CF—, —O—CH═CF— or a single bond, m is 0 or 1, and n is 0, 1 or 2.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: February 10, 2004
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Volker Reiffenrath, Detlet Pauluth, Herbert Plach
  • Liquid-crystalline medium
    Patent number: 6685996
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula I in which R, A1, Z1, Y and L are as defined in claim 1.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: February 3, 2004
    Assignee: Merck Patent GmbH
    Inventors: Kazuaki Tarumi, Brigitte Schuler, Eike Poetsch, Volker Reiffenrath, Yukiomi Tanaka