Patents by Inventor Akiko Takashima

Akiko Takashima 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: 6790488
    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 general formula (I) and one or more compounds of general formula (I*) in which R, R1*, R2*, A1, Z1, Y, L, L1*, L2*, m, x and y are as defined in claim 1.
    Type: Grant
    Filed: February 8, 2002
    Date of Patent: September 14, 2004
    Assignee: Merck Patent GmbH
    Inventors: Shinji Nakajima, Akiko Takashima, Yasushi Sugiyama, Hideo Ichinose
  • Electro-optical liquid-crystal display
    Patent number: 6602562
    Abstract: The invention generally relates to an electro-optical liquid-crystal display having a re-alignment layer, for re-aligning the liquid crystals, whose field has a component parallel to the liquid-crystal layer which is desirable for the re-alignment, including a liquid-crystalline medium of positive dielectric anisotropy, where the medium can include one or more compounds of the formula I and one or more compounds selected from the group of compounds of the formulae II and III in which R1, R2 and R3 are each, independent of one another, alkyl or alkoxy having 1 to 7 carbon atoms or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 7 carbon atoms, Y11, Y12, Y21, Y22, Y31 and Y32 are each, independent of one another, H or F, are each, independent of one another,  and Q—X is F, Cl, —OCF2H or —OCF3.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: August 5, 2003
    Assignee: Merck Patent Gesellschaft mit
    Inventors: Shinji Nakajima, Hideo Ichinose, Akiko Takashima, Yasushi Sugiyama
  • Electro-optical liquid-crystal display
    Publication number: 20030113482
    Abstract: The invention generally relates to an electro-optical liquid-crystal display having a re-alignment layer, for re-aligning the liquid crystals, whose field has a component parallel to the liquid-crystal layer which is desirable for the re-alignment, including a liquid-crystalline medium of positive dielectric anisotropy, where the medium can include one or more compounds of the formula I and one or more compounds selected from the group of compounds of the formulae II and III 1
    Type: Application
    Filed: April 28, 2000
    Publication date: June 19, 2003
    Inventors: Shinji Nakajima, Hideo Ichinose, Akiko Takashima, Yasushi Sugiyama
  • Nematic liquid crystal composition for active matrix application and reflective liquid crystal displays
    Patent number: 6524666
    Abstract: The invention relates to dielectrically positive nematic liquid crystal compositions for active matrix displays with high voltage holding ratio and very low birefringence. The composition of the mixtures is given in claim 1. The compositions are particularly suited for reflective displays. The invention further relates to particular reflective displays with low optical retardation.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: February 25, 2003
    Assignees: Merck Patent Gesellschaft, Sharp Corporation
    Inventors: Hideo Ichinose, Shinji Nakajima, Akiko Takashima, Masako Nakamura, Yoshito Hashimoto, Makoto Kanbe
  • Liquid crystalline medium
    Patent number: 6506462
    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, Y and L1 are as defined therein.
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: January 14, 2003
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Kazuaki Tarumi, Brigitte Schuler, Michael Schwarz, Hideo Ichinose, Yasuyoshi Namiki, Akiko Takashima, Hiroshi Numata
  • Liquid-crystalline medium
    Patent number: 6406761
    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, Y and L1 are as defined in claim 1.
    Type: Grant
    Filed: July 26, 2000
    Date of Patent: June 18, 2002
    Assignee: Merck Patents Gesellschaft mit beschraenkter Haftung
    Inventors: Kazuaki Tarumi, Brigitte Schuler, Michael Schwarz, Hideo Ichinose, Yasuyoshi Namiki, Akiko Takashima, Hiroshi Numata
  • Electro-optical display, and liquid-crystal medium contained therein
    Publication number: 20020017634
    Abstract: The invention relates to liquid-crystal media which comprise at least one compound selected from the group of the compounds of the formulae I to III 1
    Type: Application
    Filed: April 30, 2001
    Publication date: February 14, 2002
    Inventors: Michael Heckmeier, Herbert Plach, Hideo Ichinose, Shinji Nakajima, Yasushi Sugiyama, Akiko Takashima
  • Liquid-crystalline medium
    Patent number: 6066268
    Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having negative dielectric anisotropy, which contains at least one compound of formula I ##STR1## and at least one compound of formula II ##STR2## wherein R.sup.1 is alkyl or alkoxy with 1 to 8 C atoms or alkenyl with 2 to 7 C atoms,R.sup.2 is alkenyl with 2 to 7 C atoms,R.sup.3 and R.sup.4 are each independently alkyl or alkoxy with 1 to 8 C atoms, ##STR3## m is 0 or 1.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: May 23, 2000
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Hideo Ichinose, Yuka Ikedo, Yasuyoshi Namiki, Shinji Nakajima, Akiko Takashima, Kazuaki Tarumi, Brigitte Schuler, Volker Reiffenrath