Patents by Inventor Seiji Doi

Seiji Doi 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: 20250388471
    Abstract: There is provided a carbon material dispersion wherein even when it contains a high concentration of a carbon material, the dispersibility of the carbon material is excellent and the dispersibility is retained stably over a long period of time. The carbon material dispersion contains: at least one carbon material selected from the group consisting of carbon black, carbon fibers, carbon nanotubes, graphite, and graphene; water; and a polymeric dispersant, wherein the polymeric dispersant is a polymer having carboxy groups at least part of which are neutralized with an alkali, the polymer having 50 to 80% by mass of a constituent unit (1) derived from (meth)acrylonitrile and 20 to 50% by mass of a constituent unit (2) derived from (meth)acrylic acid, provided that the total amount of the constituent unit (1) and the constituent unit (2) is 100% by mass, and the polymer has a number average molecular weight of 10,000 to 50,000.
    Type: Application
    Filed: April 19, 2023
    Publication date: December 25, 2025
    Inventors: Hiroyuki SHIMANAKA, Yoshikazu MURAKAMI, Seiji DOI, Risa SHITAOKA, Daichi UMEDA, Shota KANEKO, Atsushi GOTO
  • Patent number: 12237097
    Abstract: The present invention provides a carbon material dispersion in which a carbon material is contained at a high concentration in a liquid medium containing an organic solvent but is unlikely to reaggregate and is stably dispersed, and from which various products, such as an ink capable of forming a coating film having excellent electric conductivity, can be formed.
    Type: Grant
    Filed: July 2, 2021
    Date of Patent: February 25, 2025
    Assignee: DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD.
    Inventors: Hiroyuki Shimanaka, Yoshikazu Murakami, Jun Kamabayashi, Seiji Doi
  • Publication number: 20240409414
    Abstract: There is provided a method for producing a carbon material dispersion, which makes it possible to simply produce a dispersion in which a carbon material containing a carbon nanotube is dispersed favorably without substantially producing a coarse aggregate, the dispersion excellent in viscosity stability.
    Type: Application
    Filed: August 4, 2022
    Publication date: December 12, 2024
    Inventors: Seiji DOI, Hiroya ONIDUKA, Risa HASHIMOTO, Daichi UMEDA, Hiroyuki SHIMANAKA, Jun KAMABAYASHI
  • Publication number: 20240409413
    Abstract: There is provided a carbon material dispersion in which a carbon material containing a carbon nanotube is dispersed favorably without substantially producing a coarse aggregate irrespective of liquid compositions and dispersion methods, the carbon material dispersion excellent in viscosity stability. The carbon material dispersion excluding one that contains a volatile salt contains: a carbon material containing a carbon nanotube; a liquid medium; and a dispersant. The content of the dispersant in terms of solid content based on 100 parts by mass of the carbon material is 204 parts by mass or less, and when a dilute dispersion is obtained by diluting the carbon material dispersion with a diluent comprising the liquid medium such that absorbance at a wavelength WM, which is a median value of an arbitrary wavelength WL within a range of 350 to 550 nm and an arbitrary wavelength WH within a range of 650 to 850 nm, is 1.8±0.
    Type: Application
    Filed: August 4, 2022
    Publication date: December 12, 2024
    Inventors: Seiji DOI, Hiroya ONIDUKA, Risa HASHIMOTO, Daichi UMEDA, Hiroyuki SHIMANAKA, Jun KAMABAYASHI
  • Patent number: 12146045
    Abstract: There is provided a carbon material dispersion which has excellent dispersibility and in which the dispersibility is retained stably over a long period of time even when the carbon material dispersion contains a carbon material at a high concentration. The carbon material dispersion is a carbon material dispersion containing a carbon material, water, and a polymeric dispersant, wherein the polymeric dispersant is a polymer including 5 to 40% by mass of a constituent unit (1) derived from a monomer 1, such as 2-vinylpyridine, 50 to 80% by mass of a constituent unit (2) derived from a monomer 2 represented by formula (1) (wherein R1 represents a hydrogen atom or the like, A represents O or NH, X represents an ethylene group or a propylene group, Y represents O, NHCOO, or NHCONH, each of R2 represents a hydrogen atom or the like, n represents 20 to 100, and R3 represents a hydrogen atom or the like), and 0.
    Type: Grant
    Filed: October 22, 2021
    Date of Patent: November 19, 2024
    Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Hiroyuki Shimanaka, Jun Kamabayashi, Yoshikazu Murakami, Seiji Doi, Yuzuru Sato
  • Publication number: 20240191054
    Abstract: There is provided a carbon material dispersion which has excellent dispersibility and in which the dispersibility is retained stably over a long period of time even when the carbon material dispersion contains a carbon material at a high concentration. The carbon material dispersion is a carbon material dispersion containing a carbon material, water, and a polymeric dispersant, wherein the polymeric dispersant is a polymer including 5 to 40% by mass of a constituent unit (1) derived from a monomer 1, such as 2-vinylpyridine, 50 to 80% by mass of a constituent unit (2) derived from a monomer 2 represented by formula (1) (wherein R1 represents a hydrogen atom or the like, A represents O or NH, X represents an ethylene group or a propylene group, Y represents O, NHCOO, or NHCONH, each of R2 represents a hydrogen atom or the like, n represents 20 to 100, and R3 represents a hydrogen atom or the like), and 0.
    Type: Application
    Filed: October 22, 2021
    Publication date: June 13, 2024
    Inventors: Hiroyuki SHIMANAKA, Jun KAMABAYASHI, Yoshikazu MURAKAMI, Seiji DOI, Yuzuru SATO
  • Publication number: 20230212343
    Abstract: The present invention provides a carbon material dispersion in which a carbon material is contained at a high concentration in a liquid medium containing an organic solvent but is unlikely to reaggregate and is stably dispersed, and from which various products, such as an ink capable of forming a coating film having excellent electric conductivity, can be formed.
    Type: Application
    Filed: July 2, 2021
    Publication date: July 6, 2023
    Inventors: Hiroyuki SHIMANAKA, Yoshikazu MURAKAMI, Jun KAMABAYASHI, Seiji DOI
  • Patent number: 9201275
    Abstract: A liquid crystal display device including first and second substrates, a liquid crystal layer, a pixel electrode, a counter electrode, a first molecule orientation film formed on the first substrate so as to cover the pixel electrode, and a second molecule orientation film formed on the second substrate so as to cover the counter electrode. The pixel electrode includes first micro-electrode patterns extending in a first direction, second micro-electrode patterns extending in a second direction, third micro-electrode patterns extending in a third direction and fourth micro-electrode patterns extending in a fourth direction, wherein the first, second, third and fourth directions are different from one another.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: December 1, 2015
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue
  • Patent number: 9181439
    Abstract: A coating formulation for forming a conductive coating film on a surface of a collector for constructing an electrode plate for an electricity storage device is provided. The coating formulation contains (A) a polymeric acid, (B) a vinyl carboxylate copolymer represented by the following formula (1): wherein R1 is selected from the group consisting of H, Na, organic groups derived from vinyl carboxylate monomers, and cations capable of forming electrolytes for the electricity storage device, R2 to R4 are independently selected from the group consisting of H, Na, C1-C6 alkyl groups, and cations capable of forming electrolytes for the electricity storage device, and a ratio (m/n) of m to n is from 0.0001 to 1, (C) a conductive material, and (D) a polar solvent.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: November 10, 2015
    Assignees: Kyoritsu Chemical & Co., Ltd., Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Taichi Uemura, Nobuyuki Kobayashi, Takanori Sannan, Shinya Tsuchida, Seiji Doi, Yosuke Ichinomiya, Yoshihiko Iijima
  • Patent number: 9081239
    Abstract: A liquid crystal display device including first and second substrates, and a liquid crystal layer sealed therebetween. The device also includes a first electrode formed on the first substrate and a second electrode formed on the second substrate; a first molecule orientation film formed on the first substrate so as to cover the first electrode; a second molecule orientation film formed on the second substrate so as to cover the second electrode; a plurality of micro structures associated with at least one of the first and second electrodes; and a plurality of rough structural patterns associated with at least one of the first and second electrodes. At least some of the micro structures extend generally parallel to each other, and the rough structural patterns extend in directions different from directions in which the micro structures extend.
    Type: Grant
    Filed: February 3, 2014
    Date of Patent: July 14, 2015
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue
  • Publication number: 20150093649
    Abstract: An object of the present invention is to provide a method of producing a current collector for an electrochemical element that enable rapid charging and discharging with low internal resistance. The method of producing a current collector for an electrochemical element in the present invention has a step for coating a coating liquid onto a metal foil, the coating liquid containing at least one substance selected from the group consisting of methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxyethyl ethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl starch, hydroxypropyl starch, dextrin, pullulan, dextran, guar gum and hydroxypropyl guar gum; an organic acid having valence of two or more or a derivative thereof, carbon particles and an organic solvent, followed by removing the organic solvent and forming a coating layer on the metal foil.
    Type: Application
    Filed: March 15, 2013
    Publication date: April 2, 2015
    Inventors: Yoshikazu Arai, Nobuyuki Kobayashi, Seiji Doi, Hitoshi Yokouchi, Masahiro Ohmori
  • Publication number: 20150002770
    Abstract: In a liquid crystal display device, liquid crystal molecules are oriented in a vertical direction to the first substrate and the second substrate by the first molecule orientation film and the second molecule orientation film, respectively, in a non-driving state. A structural pattern is formed so as to extend in a first direction parallel a surface of the liquid crystal layer and so as to form, in a driving state, an electric field periodically changing in a second direction that is parallel to the liquid crystal layer and vertical to the first direction. The liquid crystal molecules substantially tilt in the first direction in the driving state.
    Type: Application
    Filed: September 12, 2014
    Publication date: January 1, 2015
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue
  • Patent number: 8797490
    Abstract: A liquid crystal display device including first and second substrates, with a liquid crystal layer sealed therebetween. The device also includes a first electrode formed on the first substrate, a second electrode formed on the second substrate, a first molecule orientation film formed on the first substrate so as to cover the first electrode, a second molecule orientation film formed on the second substrate so as to cover the second electrode, and a plurality of micro structures associated with at least one of the first and second electrodes, wherein at least some of the micro structures extend generally parallel to each other. When a driving voltage is applied between the first and second electrodes, liquid crystal molecules of the liquid crystal layer are oriented such that no dark line occurs in a vicinity of the plurality of micro structures and no dark line occurs between adjacent micro structures.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: August 5, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Hiroyasu Inoue, Takashi Takagi
  • Publication number: 20140198274
    Abstract: In a liquid crystal display device, liquid crystal molecules are oriented in a vertical direction to the first substrate and the second substrate by the first molecule orientation film and the second molecule orientation film, respectively, in a non-driving state. A structural pattern is formed so as to extend in a first direction parallel to a surface of the liquid crystal layer and so as to form, in a driving state, an electric field periodically changing in a second direction that is parallel to the liquid crystal layer and vertical to the first direction. The liquid crystal molecules substantially tilt in the first direction in the driving state.
    Type: Application
    Filed: February 3, 2014
    Publication date: July 17, 2014
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue
  • Publication number: 20140016066
    Abstract: In a liquid crystal display device, liquid crystal molecules are oriented in a vertical direction to the first substrate and the second substrate by the first molecule orientation film and the second molecule orientation film, respectively, in a non-driving state. A structural pattern is formed so as to extend in a first direction parallel to a surface of the liquid crystal layer and so as to form, in a driving state, an electric field periodically changing in a second direction that is parallel to the liquid crystal layer and vertical to the first direction. The liquid crystal molecules substantially tilt in the first direction in the driving state.
    Type: Application
    Filed: September 18, 2013
    Publication date: January 16, 2014
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Ochida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue
  • Patent number: 8570477
    Abstract: A substrate for a liquid crystal display device, including a pixel electrode formed on the substrate, wherein the pixel electrode includes a micro-cutout pattern defined by a plurality of micro-cutouts extending in four different directions with respect to an extension direction of a rough structural pattern. The substrate also includes a first electrode extending in a first direction, a second electrode extending in a second direction that is approximately perpendicular to the first direction, and a contact hole that electrically connects the pixel electrode and the first electrode. A portion of the rough structural pattern and/or a portion of the micro-cutout pattern overlap the first electrode. Also disclosed is a liquid crystal display device including such a substrate.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: October 29, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue
  • Publication number: 20130162921
    Abstract: In a liquid crystal display device, liquid crystal molecules are oriented in a vertical direction to the first substrate and the second substrate by the first molecule orientation film and the second molecule orientation film, respectively, in a non-driving state. A structural pattern is formed so as to extend in a first direction parallel to a surface of the liquid crystal layer and so as to form, in a driving state, an electric field periodically changing in a second direction that is parallel to the liquid crystal layer and vertical to the first direction. The liquid crystal molecules substantially tilt in the first direction in the driving state.
    Type: Application
    Filed: September 13, 2012
    Publication date: June 27, 2013
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue
  • Patent number: 8471994
    Abstract: A liquid crystal display device including first and second substrates, with a liquid crystal layer sealed therebetween; and first and second electrodes formed, respectively, on the first and second substrates. A first molecule orientation film is formed on the first substrate so as to cover the first electrode and a second molecule orientation film formed on the second substrate so as to cover the second electrode. A polarizer with a light absorption axis P is provided outside of the first substrate, and an analyzer with a light absorption axis A is provided outside of the second substrate. The light absorption axis A crosses the light absorption axis P. A plurality of micro structures are associated with at least one of the first and second electrodes, wherein the micro structures are obliquely arranged with respect to the light absorption axis P and the light absorption axis A.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: June 25, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue
  • Publication number: 20110216274
    Abstract: In a liquid crystal display device, liquid crystal molecules are oriented in a vertical direction to the first substrate and the second substrate by the first molecule orientation film and the second molecule orientation film, respectively, in a non-driving state. A structural pattern is formed so as to extend in a first direction parallel to a surface of the liquid crystal layer and so as to form, in a driving state, an electric field periodically changing in a second direction that is parallel to the liquid crystal layer and vertical to the first direction. The liquid crystal molecules substantially tilt in the first direction in the driving state.
    Type: Application
    Filed: March 18, 2011
    Publication date: September 8, 2011
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue
  • Patent number: 7952675
    Abstract: A liquid crystal display device including 1st and 2nd substrates. A linearly extending scan electrode and a linearly extending signal electrode are formed on the 1st substrate, wherein the scan electrode extends in a direction crossing an extension direction of the signal electrode. A liquid crystal layer is between the 1st and 2nd substrates, and a pixel electrode is formed on the 1st substrate. The pixel electrode is electrically connected to both the scan and signal electrodes. The pixel electrode is divided into at least two regions such that at least two domains of different liquid crystal orientation directions are defined within a single pixel. A 1st and a 2nd of the at least two regions are not aligned in parallel with either the extension direction of the scan electrode or the extension direction of the signal electrode. The 1st and 2nd regions each include a micro-cutout pattern.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: May 31, 2011
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Shingo Kataoka, Arihiro Takeda, Takahiro Sasaki, Tsutomu Seino, Yoshio Koike, Hidefumi Yoshida, Yuichi Inoue, Kazutaka Hanaoka, Seiji Tanuma, Takatoshi Mayama, Kimiaki Nakamura, Hideo Chida, Seiji Doi, Tetsuya Fujikawa, Takashi Takagi, Hiroyasu Inoue