Patents by Inventor MAIKO MATSUKUMA

MAIKO MATSUKUMA 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).

  • Patent number: 10655065
    Abstract: A liquid crystal compound comprising a specific compound having a positive dielectric anisotropy as the first component, and a specific compound having a low viscosity as a second component. Further, the liquid crystal compound may contain a specific compound having a positive dielectric anisotropy as the third component, a specific compound having a maximum temperature or a low viscosity as the fourth component, or a specific compound having a negative dielectric anisotropy as the fifth component.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: May 19, 2020
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Maiko Matsukuma, Masayuki Saito
  • Patent number: 10053425
    Abstract: To provide a compound having an effect for preventing photolysis of a liquid crystal composition, and having a high solubility in the liquid crystal composition, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition. The compound is represented by formula (1), the liquid crystal composition contains the compound, and the liquid crystal display device includes the composition. In formula (1), R1, R2, R3 and R4 are independently hydrogen or alkyl having 1 to 4 carbons; ring A1 and ring A2 are independently 1,4-cyclohexylene, 1,4-phenylene or the like; Z1, Z2 and Z3 are independently a single bond, alkylene or the like; and n is 0, 1 or 2.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: August 21, 2018
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Yasuyuki Gotoh, Kenji Hirata, Maiko Matsukuma, Chikahide Kanadani
  • Publication number: 20180030349
    Abstract: A liquid crystal compound comprising a specific compound having a positive dielectric anisotropy as the first component, and a specific compound having a low viscosity as a second component. Further, the liquid crystal compound may contain a specific compound having a positive dielectric anisotropy as the third component, a specific compound having a maximum temperature or a low viscosity as the fourth component, or a specific compound having a negative dielectric anisotropy as the fifth component.
    Type: Application
    Filed: August 1, 2017
    Publication date: February 1, 2018
    Applicants: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Maiko MATSUKUMA, Masayuki SAITO
  • Patent number: 9617477
    Abstract: A compound represented by formula (1), a liquid crystal composition, a liquid crystal display device are described. In formula (1), for example, the ring A1 and the ring A4 are phenylene or cyclohexylene; Z1, Z2, Z3 and Z4 are a single bond or alkylene having 1 to 6 carbons; L1 is a single bond; s and t are 0; and P1, P2, P3 and P4 are a polymerizable group.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: April 11, 2017
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Yasuyuki Goto, Maiko Matsukuma, Junichi Yamashita
  • Publication number: 20160289189
    Abstract: To provide a compound having an effect for preventing photolysis of a liquid crystal composition, and having a high solubility in the liquid crystal composition, a liquid crystal composition containing the compound, and a liquid crystal display device including the composition. The compound is represented by formula (1), the liquid crystal composition contains the compound, and the liquid crystal display device includes the composition. In formula (1), R1, R2, R3 and R4 are independently hydrogen or alkyl having 1 to 4 carbons; ring A1 and ring A2 are independently 1,4-cyclohexylene, 1,4-phenylene or the like; Z1, Z2 and Z3 are independently a single bond, alkylene or the like; and n is 0, 1 or 2.
    Type: Application
    Filed: October 29, 2014
    Publication date: October 6, 2016
    Applicants: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Yasuyuki Gotoh, Kenji Hirata, Maiko Matsukuma, Chikahide Kanadani
  • Publication number: 20150344784
    Abstract: A compound represented by formula (1), a liquid crystal composition, a liquid crystal display device are described. In formula (1), for example, the ring A1 and the ring A4 are phenylene or cyclohexylene; Z1, Z2, Z3 and Z4 are a single bond or alkylene having 1 to 6 carbons; L1 is a single bond; s and t are 0; and P1, P2, P3 and P4 are a polymerizable group.
    Type: Application
    Filed: August 7, 2015
    Publication date: December 3, 2015
    Inventors: YASUYUKI GOTO, MAIKO MATSUKUMA, JUNICHI YAMASHITA
  • Patent number: 9157027
    Abstract: A compound represented by formula (1), a liquid crystal composition, a liquid crystal display device are described. In formula (1), for example, the ring A1 and the ring A4 are phenylene or cyclohexylene; Z1, Z2, Z3 and Z4 are a single bond or alkylene having 1 to 6 carbons; L1 is a single bond; s and t are 0; and P1, P2, P3 and P4 are a polymerizable group.
    Type: Grant
    Filed: December 23, 2012
    Date of Patent: October 13, 2015
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Yasuyuki Goto, Maiko Matsukuma, Junichi Yamashita
  • Patent number: 9139672
    Abstract: A liquid crystal composition and a liquid crystal display device which includes the composition are provided. The liquid crystal composition contains a specific compound having a polymerizable group as a first component, and may contain a specific compound having a large negative dielectric anisotropy and a low minimum temperature as a second component, or a specific compound having a small viscosity or a large maximum temperature as a third component. The liquid crystal composition satisfies at least one of the following characteristics: a high maximum temperature of a nematic phase, a low minimum temperature of the nematic phase, a small viscosity, a suitable optical anisotropy, a large negative dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light and a high stability to heat. Alternatively, a liquid crystal composition having a suitable balance regarding at least two of the aforementioned characteristics is also provided.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: September 22, 2015
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Yukihiro Fujita, Yoshimasa Furusato, Maiko Matsukuma
  • Patent number: 9073850
    Abstract: The invention provides a compound having two polymerizable groups, wherein one is bonded directly to the ring and the other is bonded to the ring through a spacer, as a compound in which the polymerizability is not decreased and the solubility is high in a liquid crystal composition. A compound represented by formula (1), wherein in formula (1), for example, A1 and A2 are 1,4-phenylene in which at least one hydrogen has been replaced by fluorine; Z1 is alkylene having 1 to 12 carbons; Z2 is alkylene having 1 to 12 carbons; X1 is hydrogen, fluorine, methyl or trifluoromethyl; P1 is a polymerizable group; and a is an integer from 0 to 3.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: July 7, 2015
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Yasuyuki Gotoh, Maiko Matsukuma
  • Patent number: 9045684
    Abstract: To provide a liquid crystal composition satisfying at least one characteristic such as high maximum temperature of nematic phase, low minimum temperature thereof, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy and specific resistance, high stability to ultraviolet light and heat; a liquid crystal composition having a suitable balance regarding at least two thereof; and an AM device including the composition.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: June 2, 2015
    Assignees: JNC CORPORATION, JNC PETROCHEMICAL CORPORATION
    Inventors: Yasuyuki Gotoh, Teizi Satou, Maiko Matsukuma, Chikahide Kanadani, Yoshimasa Furusato
  • Publication number: 20140346399
    Abstract: A liquid crystal composition and a liquid crystal display device which includes the composition are provided. The liquid crystal composition contains a specific compound having a polymerizable group as a first component, and may contain a specific compound having a large negative dielectric anisotropy and a low minimum temperature as a second component, or a specific compound having a small viscosity or a large maximum temperature as a third component. The liquid crystal composition satisfies at least one of the following characteristics: a high maximum temperature of a nematic phase, a low minimum temperature of the nematic phase, a small viscosity, a suitable optical anisotropy, a large negative dielectric anisotropy, a large specific resistance, a high stability to ultraviolet light and a high stability to heat. Alternatively, a liquid crystal composition having a suitable balance regarding at least two of the aforementioned characteristics is also provided.
    Type: Application
    Filed: October 1, 2012
    Publication date: November 27, 2014
    Inventors: Yukihiro Fujita, Yoshimasa Furusato, Maiko Matsukuma
  • Publication number: 20140027671
    Abstract: To provide a liquid crystal composition satisfying at least one characteristic such as high maximum temperature of nematic phase, low minimum temperature thereof, small viscosity, suitable optical anisotropy, large negative dielectric anisotropy and specific resistance, high stability to ultraviolet light and heat; a liquid crystal composition having a suitable balance regarding at least two thereof; and an AM device including the composition.
    Type: Application
    Filed: July 19, 2013
    Publication date: January 30, 2014
    Inventors: YASUYUKI GOTOH, TEIZI SATOU, MAIKO MATSUKUMA, CHIKAHIDE KANADANI, YOSHIMASA FURUSATO
  • Publication number: 20130277609
    Abstract: A compound represented by formula (1), a liquid crystal composition, a liquid crystal display device are described. In formula (1), for example, the ring A1 and the ring A4 are phenylene or cyclohexylene; Z1, Z2, Z3 and Z4 are a single bond or alkylene having 1 to 6 carbons; L1 is a single bond; s and t are 0; and P1, P2, P3 and P4 are a polymerizable group.
    Type: Application
    Filed: December 23, 2012
    Publication date: October 24, 2013
    Applicants: JNC PETROCHEMICAL CORPORATION, JNC CORPORATION
    Inventors: YASUYUKI GOTO, MAIKO MATSUKUMA, JUNICHI YAMASHITA
  • Publication number: 20130134354
    Abstract: The invention provides a compound having two polymerizable groups, wherein one is bonded directly to the ring and the other is bonded to the ring through a spacer, as a compound in which the polymerizability is not decreased and the solubility is high in a liquid crystal composition. A compound represented by formula (1), wherein in formula (1), for example, A1 and A2 are 1,4-phenylene in which at least one hydrogen has been replaced by fluorine; Z1 is alkylene having 1 to 12 carbons; Z2 is alkylene having 1 to 12 carbons; X1 is hydrogen, fluorine, methyl or trifluoromethyl; P1 is a polymerizable group; and a is an integer from 0 to 3.
    Type: Application
    Filed: August 27, 2012
    Publication date: May 30, 2013
    Applicants: JNC PETROCHEMICAL CORPORATION, JNC CORPORATION
    Inventors: YASUYUKI GOTOH, MAIKO MATSUKUMA