Patents by Inventor Katsunori Shimada

Katsunori Shimada 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).

  • Publication number: 20140211139
    Abstract: The present invention relates to a liquid crystal display device that includes a particular liquid crystal composition and a color filter that uses a particular pigment. The present invention provides a liquid crystal display device that prevents a decrease in voltage holding ratio (VHR) and an increase in ion density (ID) in a liquid crystal layer and resolves the problems of display defects such as white streaks, alignment nonuniformity, and image sticking. Since the liquid crystal display device of the present invention prevents a decrease in voltage holding ratio (VHR) and an increase in ion density (ID) in the liquid crystal layer and resolves the problems of display defects such as image sticking, the liquid crystal display device is useful as VA-mode and PSVA-mode liquid crystal display devices of an active matrix drive type, and is applicable to liquid crystal display devices of liquid crystal televisions, monitors, cellular phones, smart phones, etc.
    Type: Application
    Filed: March 31, 2014
    Publication date: July 31, 2014
    Applicant: DIC CORPORATION
    Inventors: Shinji Ogawa, Yoshinori Iwashita, Akira Kimura, Seiji Funakura, Katsunori Shimada
  • Patent number: 8420860
    Abstract: The present invention provides a triarylmethane compound and a color filter containing the compound in a blue pixel portion, the triarylmethane compound being capable of providing a colored material which causes little change in hue over a long period of time even under high temperature or light irradiation. For example, when used for preparing a blue pixel portion of a color filter, the triarylmethane compound is capable of providing a liquid crystal display device or the like which can provide a high-brightness liquid crystal display having excellent brightness over a long period of time even under high temperature or light irradiation. The triarylmethane compound contains, as a counter anion for a basic triarylmethane dye cation, a heteropolyoxometalate anion represented by (P2MoyW18-yO62)6?/6 wherein y=an integer of 1, 2, or 3, and the color filter contains the triarylmethane compound in a blue pixel portion.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: April 16, 2013
    Assignee: DIC Corporation
    Inventors: Hitoshi Kondou, Shougo Yamada, Ryousuke Asami, Katsunori Shimada
  • Patent number: 8404894
    Abstract: There is provided a triarylmethane compound which can provide a colored product that has light resistance equivalent to heretofore available light resistance and that undergoes only a small change in hue over a long period of time even when having a high-temperature heat history. For example, when a blue pixel portion of a color filter is formed, there is provided a triarylmethane compound which can provide a liquid crystal display apparatus or the like that has light resistance equivalent to heretofore available light resistance and that can perform high-brightness liquid crystal display for a long time even at high temperature. There is also provided a color filter containing the triarylmethane compound in the blue pixel portion. In the triarylmethane compound, the counter-anion of a basic triarylmethane dye cation is a heteropolyoxometalate anion represented by (SiMoW11O40)4?/4. The color filter contains the triarylmethane compound in a blue pixel portion.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: March 26, 2013
    Assignee: DIC Corporation
    Inventors: Hitoshi Kondou, Shougo Yamada, Ryousuke Asami, Katsunori Shimada
  • Publication number: 20130018198
    Abstract: The present invention provides a triarylmethane compound and a color filter containing the compound in a blue pixel portion, the triarylmethane compound being capable of providing a colored material which causes little change in hue over a long period of time even under high temperature or light irradiation. For example, when used for preparing a blue pixel portion of a color filter, the triarylmethane compound is capable of providing a liquid crystal display device or the like which can provide a high-brightness liquid crystal display having excellent brightness over a long period of time even under high temperature or light irradiation. The triarylmethane compound contains, as a counter anion for a basic triarylmethane dye cation, a heteropolyoxometalate anion represented by (P2MoyW18-yO62)6?/6 wherein y=an integer of 1, 2, or 3, and the color filter contains the triarylmethane compound in a blue pixel portion.
    Type: Application
    Filed: September 21, 2011
    Publication date: January 17, 2013
    Applicant: DID Corporation
    Inventors: Hitoshi Kondou, Shougo Yamada, Ryousuke Asami, Katsunori Shimada
  • Publication number: 20130018208
    Abstract: There is provided a triarylmethane compound which can provide a colored product that has light resistance equivalent to heretofore available light resistance and that undergoes only a small change in hue over a long period of time even when having a high-temperature heat history. For example, when a blue pixel portion of a color filter is formed, there is provided a triarylmethane compound which can provide a liquid crystal display apparatus or the like that has light resistance equivalent to heretofore available light resistance and that can perform high-brightness liquid crystal display for a long time even at high temperature. There is also provided a color filter containing the triarylmethane compound in the blue pixel portion. In the triarylmethane compound, the counter-anion of a basic triarylmethane dye cation is a heteropolyoxometalate anion represented by (SiMoW11O40)4?/4. The color filter contains the triarylmethane compound in a blue pixel portion.
    Type: Application
    Filed: September 21, 2011
    Publication date: January 17, 2013
    Inventors: Hitoshi Kondou, Shougo Yamada, Ryousuke Asami, Katsunori Shimada
  • Patent number: 6784231
    Abstract: A pigment having weak dispersion force to be readily dispersed in a medium to be colored from which an excellent yellow image having superior transparency can be produced. The pigment includes a compound having the same chemical formula as C.I. Pigment Yellow 180. The BET specific surface area based on the nitrogen absorption process of the pigment is 20-100 m2/g, and the ratio of the absolute strength of X-ray diffraction at Bragg angle 2&thgr;=17.5°±0.2° to the absolute strength of X-ray diffraction at Bragg angle 2&thgr;=18.2°±0.2° of the pigment in a powder X-ray diffraction diagram using a CuK&agr; characteristic X-ray is less than 1.8/1.0. The present invention also provides a dispersion including the pigment and a thermoplastic resin having excellent transparency and color strength.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: August 31, 2004
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Katsunori Shimada, Junko Sunouchi
  • Publication number: 20030110982
    Abstract: A pigment having weak dispersion force to be readily dispersed in a medium to be colored from which an excellent yellow image having superior transparency can be produced. The pigment includes a compound having the same chemical formula as C.I. Pigment Yellow 180. The BET specific surface area based on the nitrogen absorption process of the pigment is 20-100 m2/g, and the ratio of the absolute strength of X-ray diffraction at Bragg angle 2&thgr;=17.5°±0.2° to the absolute strength of X-ray diffraction at Bragg angle 2&thgr;=18.2°±0.2° of the pigment in a powder X-ray diffraction diagram using a CuK&agr; characteristic X-ray is less than 1.8/1.0. The present invention also provides a dispersion including the pigment and a thermoplastic resin having excellent transparency and color strength.
    Type: Application
    Filed: March 19, 2002
    Publication date: June 19, 2003
    Applicant: DAINIPPON INK AND CHEMICALS, INC.
    Inventors: Katsunori Shimada, Junko Sunouchi