Patents by Inventor Harald Hirschmann

Harald Hirschmann 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
    Patent number: 6902777
    Abstract: A liquid-crystalline mediums which contain one or more compounds of the formula A and at least one compound of the formula B wherein compounds of formula A contain at least one ring selected from and in which Ra, Rb, ring A and ring B, Y, Z1, Z2, a, L1, L2, L3, L4, L5, L6, L7, L8 and L9 are as defined herein, are suitable for use in twisted nematic (TN) and supertwisted nematic (STN) liquid-crystal displays. Such displays have very short response times and good steepnesses and angle dependencies.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: June 7, 2005
    Assignee: Merck Patent GmbH
    Inventors: Harald Hirschmann, Eike Poetsch, Peer Kirsch, Sabine Schoen
  • Liquid-crystal medium and electro-optical display containing same
    Publication number: 20050104038
    Abstract: Disclosed are nematic liquid-crystal media which have an initial current density of 0.05 ?A/cm2 or less and a threshold voltage of 1.0 V or less and their use in liquid-crystal displays, preferably TN or STN displays.
    Type: Application
    Filed: November 5, 2004
    Publication date: May 19, 2005
    Inventors: Harald Hirschmann, Sabine Schoen
  • Nematic liquid-crystal composition
    Patent number: 6890606
    Abstract: The invention relates to nematic liquid-crystal compositions comprising bisalkenyl compounds of the formula I and to their use in plasma-addressed LCDs.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: May 10, 2005
    Assignee: Merck Patent GmbH
    Inventors: Harald Hirschmann, Sven Schupfer, Marcus Reuter
  • Tolane derivatives and liquid crystalline medium
    Publication number: 20040236138
    Abstract: Tolane compounds of the formula I 1
    Type: Application
    Filed: May 19, 2004
    Publication date: November 25, 2004
    Inventors: Harald Hirschmann, Kevin Adlem, Patricia Saxton, Mark John Goulding, Martin Heeney
  • 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
    Publication number: 20040222404
    Abstract: The invention relates to a liquid-crystalline medium which is characterised in that it comprises one or more compounds of the formula A 1
    Type: Application
    Filed: February 13, 2004
    Publication date: November 11, 2004
    Inventors: Harald Hirschmann, Peer Kirsch
  • Liquid-crystalline medium
    Patent number: 6808763
    Abstract: The invention relates to a liquid-crystalline medium which is characterized in that it comprises one or more compounds of the formula A and one more compounds of the formula B in which Ra, Rb, Rbb, x and L1 are as defined in claim 1.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: October 26, 2004
    Assignee: Merck Patent GmbH
    Inventors: Harald Hirschmann, Sven Schüpfer, Martina Weidner, Renate Graulich
  • Liquid-crystalline mixtures
    Publication number: 20040197494
    Abstract: Nematic liquid-crystal mixtures comprising one or more compounds of the formula I 1
    Type: Application
    Filed: April 7, 2004
    Publication date: October 7, 2004
    Inventors: Harald Hirschmann, Sven Schuepfer, Renate Graulich, Martina Weidner, Kevin Adlem, Mark John Goulding, Patricia Saxton
  • 1,4-Di-(trans-4-cyclohexyl)benzene derivatives and their use in liquid crystal media and liquid crystal devices
    Publication number: 20040164276
    Abstract: Liquid-crystalline media comprising one or more compounds of the formula I 1
    Type: Application
    Filed: February 13, 2004
    Publication date: August 26, 2004
    Inventors: Harald Hirschmann, Martina Weidner, Sven Schuepfer, Renate Graulich, Mark John Goulding, Martin Heeney, Warren Duffy
  • 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 crystal mixtures
    Publication number: 20040149956
    Abstract: The invention relates to TN and STN liquid-crystal displays and to the nematic liquid-crystal mixtures used therein, characterised in that they comprise one or more compounds of the formula I 1
    Type: Application
    Filed: November 24, 2003
    Publication date: August 5, 2004
    Inventors: Antje Mhlfeld, Michael Junge, Harald Hirschmann, Sabine Schoen, Juliane Suermann, Ursula Patwal, Dagmar Zimmermann
  • Liquid-crystalline medium
    Publication number: 20040140452
    Abstract: A liquid-crystalline mediums which contain one or more compounds of the formula A 1
    Type: Application
    Filed: December 22, 2003
    Publication date: July 22, 2004
    Inventors: Harald Hirschmann, Eike Poetsch, Peer Kirsch, Sabine Schoen
  • Liquid-crystalline medium
    Patent number: 6730372
    Abstract: The invention relates to a liquid-crystalline medium which is characterized in that it comprises one or more compounds of the formula A and at least one compound of the formula B in which Ra, Rb, Y, Z1, Z2, L1, L2, L3, L4, L5, L6, L7 and L8 are as defined in claim 1.
    Type: Grant
    Filed: January 28, 2003
    Date of Patent: May 4, 2004
    Assignee: Merck Patent Gesellschaft mit Beschränkter Haftung
    Inventors: Harald Hirschmann, Dagmar Zimmermann, Ursula Patwal, Antje Mühlfeld, Sabine Schoen, Martina Weidner
  • STN liquid crystal display
    Patent number: 6649229
    Abstract: The invention relates to supertwist liquid-crystal displays (SLCDs) having very short response times and good steepnesses and angular dependences and to the novel nematic liquid-crystal mixtures employed therein, which are distinguished by the fact that they comprise at least one compound of the formula, IA and at least one compound of the formula IB and/or at least one compound of the formula IC in which Ra, Rb, Rc, Rd, Re, Y1, Y2, Y3, Y4, q and p are as defined herein.
    Type: Grant
    Filed: December 23, 2002
    Date of Patent: November 18, 2003
    Assignee: Merck Patent GmbH
    Inventor: Harald Hirschmann
  • Liquid-crystalline medium
    Publication number: 20030209691
    Abstract: The invention relates to a liquid-crystalline medium which is characterized in that it comprises one or more compounds of the formula A 1
    Type: Application
    Filed: January 28, 2003
    Publication date: November 13, 2003
    Applicant: MERCK PATENTGESELLSCHAFT MIT BESCHRANKTER HAFTUNG
    Inventors: Harald Hirschmann, Dagmar Zimmermann, Ursula Patwal, Antje Muhlfeld, Sabine Schoen, Martina Weidner
  • Liquid-crystalline medium
    Publication number: 20030194511
    Abstract: The invention relates to a liquid-crystalline medium which is characterized in that it comprises one or more compounds of the formula A 1
    Type: Application
    Filed: December 20, 2002
    Publication date: October 16, 2003
    Applicant: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Harald Hirschmann, Sven Schupfer, Martina Weidner, Renate Graulich
  • Liquid-crystalline medium
    Patent number: 6613401
    Abstract: Liquid-crystalline media comprising one or more compounds of formula A and at least one compound of formula B are suitable for use in TN and STN displays.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: September 2, 2003
    Assignee: Merck Patent GmbH
    Inventors: Harald Hirschmann, Sven Schüpfer, Renate Graulich, Martina Weidner
  • STN liquid crystal display
    Publication number: 20030148043
    Abstract: The invention relates to supertwist liquid-crystal displays (SLCDs) having very short response times and good steepnesses and angular dependences and to the novel nematic liquid-crystal mixtures employed therein, which are distinguished by the fact that they comprise at least one compound of the formula IA 1
    Type: Application
    Filed: December 23, 2002
    Publication date: August 7, 2003
    Applicant: Merck Patent GmbH
    Inventor: Harald Hirschmann
  • Nematic liquid-crystal composition
    Publication number: 20030136945
    Abstract: The invention relates to nematic liquid-crystal compositions comprising bisalkenyl compounds of the formula I 1
    Type: Application
    Filed: October 15, 2002
    Publication date: July 24, 2003
    Applicant: Merck Paten GmbH
    Inventors: Harald Hirschmann, Sven Schupfer, Marcus Reuter
  • Liquid-crystalline mixtures
    Publication number: 20030127629
    Abstract: A liquid-crystalline mixture that contains one or more compounds of each of the formulae IA, IB and IC 1
    Type: Application
    Filed: July 26, 2002
    Publication date: July 10, 2003
    Applicant: Merck Patent GmbH
    Inventors: Harald Hirschmann, Volker Reiffenrath, Marcus Reuter, Sabine Schoen, Sven Schupfer, Clarissa Weller