Patents by Inventor Takahiro Kawagoe

Takahiro Kawagoe 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: 11101466
    Abstract: A carbon electrode material is disclosed for a redox flow battery that particularly, even when using an Mn—Ti type electrolyte, while stabilizing Mn ions and suppressing a rise in cell resistance during initial charge and discharge, has excellent oxidation resistance. The electrode material includes a carbonaceous fiber, and a carbonaceous material for binding the carbonaceous fiber, and satisfies the requirements: (1) when the size of a crystallite in a c axis direction found by X-ray diffraction in the carbonaceous material (B) is Lc(B), Lc(B) is 10 nm or greater; (2) when the size of the crystallite in the c axis direction found by X-ray diffraction in the carbonaceous fiber (A) is Lc(A), Lc(B)/Lc(A) is 1.0 or greater; and (3) the number of bonded oxygen atoms of the carbon electrode material surface is 1.0% or greater than the total number of carbon atoms of the carbon electrode material surface.
    Type: Grant
    Filed: August 29, 2018
    Date of Patent: August 24, 2021
    Assignees: TOYOBO CO., LTD., SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Toshikatsu Enjoji, Takahiro Matsumura, Ryouhei Iwahara, Masaru Kobayashi, Masako Tatsuta, Yongrong Dong, Masayuki Oya, Kenichi Itou, Yoshiyasu Kawagoe
  • Patent number: 7705823
    Abstract: Each embodiment relates to an image display device which comprises an image display panel, in which two or more groups of particles having different colors and different charge characteristics are sealed between two substrates, at least one of two substrates being transparent, and, in which the particles, to which an electrostatic field produced by a pair of electrodes provided on one or both substrates is applied, are made to fly and move so as to display an image.
    Type: Grant
    Filed: February 7, 2003
    Date of Patent: April 27, 2010
    Assignee: Bridgestone Corporation
    Inventors: Norio Nihei, Hajime Kitano, Gaku Yakushiji, Kazuya Murata, Koji Takagi, Yoshitomo Masuda, Takahiro Kawagoe, Reiji Hattori
  • Patent number: 7646530
    Abstract: In particles for image displaying used in an image display device, in which one or more kind of particles are sealed between opposed substrates, at least one substrate being transparent, and, in which the particles are made to fly and move so as to display an image, each particle has a micro-irregularity at its surface. Moreover, in an image display device, in which one or more kind of particles are sealed between opposed substrates, at least one substrate being transparent, and, in which the particles, to which an electrostatic field produced by two kinds of electrodes having different potentials is applied, are made to fly and move so as to display an image, use is made of each particle having a micro-irregularity at its surface.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: January 12, 2010
    Assignee: Bridgestone Corporation
    Inventors: Koji Takagi, Kazuya Murata, Norio Nihei, Gaku Yakushiji, Hajime Kitano, Yoshitomo Masuda, Takahiro Kawagoe
  • Patent number: 7525719
    Abstract: The present invention intends to provide particles for displaying images used in an image display device capable of displaying and eliminating repeatedly accompanied by flight and movement of particles utilizing Coulomb force, being superior in stability, particularly in repetition durability, memory characteristic stability, adaptability for temperature change, having capability of regulating charge amount, and accordingly, favorable images with sufficient contrast should be stably obtained. The present invention provides particles coated with a resin; specifying Span of particle diameter distribution, charge attenuation property, thermal change of the surface hardness, tensile break strength, Izod impact strength (with a notch), abrasion loss (Taber), tensile elastic modulus, flexural elastic modulus, or tear strength. The present invention also proposes about the structure of the particles.
    Type: Grant
    Filed: September 19, 2002
    Date of Patent: April 28, 2009
    Assignee: Bridgestone Corporation
    Inventors: Gaku Yakushiji, Hajime Kitano, Kazuya Murata, Norio Nihei, Koji Takagi, Yoshitomo Masuda, Takahiro Kawagoe
  • Patent number: 7321459
    Abstract: In the image display device according to the first aspect of the invention, a liquid powder composed of a solid material stably floating as a dispersant in a gas and exhibiting a high fluidity in an aerosol state is sealed between opposed substrates, at least one substrate being transparent, and the liquid powder is moved. Moreover, in the image display device according to the second aspect of the invention, a porous spacer is arranged between opposed substrates, at least one substrate being transparent, a liquid powder composed of a solid material stably floating as a dispersant in gas and exhibiting a high fluidity in an aerosol state is sealed, and the liquid powder is moved.
    Type: Grant
    Filed: March 6, 2003
    Date of Patent: January 22, 2008
    Assignee: Bridgestone Corporation
    Inventors: Yoshitomo Masuda, Gaku Yakushiji, Kazuya Murata, Norio Nihei, Koji Takagi, Itsuo Tanuma, Hajime Kitano, Takahiro Kawagoe
  • Patent number: 7224510
    Abstract: A reversible image display panel which comprises a pair of substrates one of which is transparent and a group of particles charged with single polarity, a group of particles with single color charged with single polarity, a group of particles having portions with different colors and different charge characteristics, or two groups of particles with different charge characteristics each enclosed between the substrates, characterized in applying an electric field across the substrates, and displaying images by flying and moving the particles. The reversible image display panel and the image display device in accordance with the invention have fast response speed and simple structure, being superior in stability and vividity. In an occasion of driving, generation of the strong electric field is unnecessary for them and accordingly, electric circuits can be assembled employing general purpose electronic materials.
    Type: Grant
    Filed: November 21, 2002
    Date of Patent: May 29, 2007
    Assignee: Bridgestone Corporation
    Inventors: Hajime Kitano, Gaku Yakushiji, Kazuya Murata, Norio Nihei, Koji Takagi, Yoshitomo Masuda, Takahiro Kawagoe
  • Publication number: 20060238488
    Abstract: Each embodiment relates to an image display device which comprises an image display panel, in which two or more groups of particles having different colors and different charge characteristics are sealed between two substrates, at least one of two substrates being transparent, and, in which the particles, to which an electrostatic field produced by a pair of electrodes provided on one or both substrates is applied, are made to fly and move so as to display an image.
    Type: Application
    Filed: February 7, 2003
    Publication date: October 26, 2006
    Inventors: Norio Nihei, Hajime Kitano, Gaku Yakushiji, Kazuya Murata, Koji Takagi, Yoshitomo Masuda, Takahiro Kawagoe, Reiji Hattori
  • Publication number: 20060087718
    Abstract: In particles for image displaying used in an image display device, in which one or more kind of particles are sealed between opposed substrates, at least one substrate being transparent, and, in which the particles are made to fly and move so as to display an image, each particle has a micro-irregularity at its surface. Moreover, in an image display device, in which one or more kind of particles are sealed between opposed substrates, at least one substrate being transparent, and, in which the particles, to which an electrostatic field produced by two kinds of electrodes having different potentials is applied, are made to fly and move so as to display an image, use is made of each particle having a micro-irregularity at its surface.
    Type: Application
    Filed: April 17, 2003
    Publication date: April 27, 2006
    Applicant: Bridgestone Corporation
    Inventors: Koji Takagi, Kazuya Murata, Norio Nihei, Gaku Yakushiji, Hajime Kitano, Yoshitomo Masuda, Takahiro Kawagoe
  • Publication number: 20060033849
    Abstract: In the image display device according to the first aspect of the invention, a liquid powder composed of a solid material stably floating as a dispersant in a gas and exhibiting a high fluidity in an aerosol state is sealed between opposed substrates, at least one substrate being transparent, and the liquid powder is moved. Moreover, in the image display device according to the second aspect of the invention, a porous spacer is arranged between opposed substrates, at least one substrate being transparent, a liquid powder composed of a solid material stably floating as a dispersant in gas and exhibiting a high fluidity in an aerosol state is sealed, and the liquid powder is moved.
    Type: Application
    Filed: March 6, 2003
    Publication date: February 16, 2006
    Inventors: Yoshitomo Masuda, Gaku Yakushiji, Kazuya Murata, Norio Nihei, Koji Takagi, Itsuo Tanuma, Hajime Kitano, Takahiro Kawagoe
  • Publication number: 20050259068
    Abstract: An image display device has an image display panel, in which two or more groups of particles having different colors and different charge characteristics are sealed between two substrates, at least one of two substrates being transparent, and, in which the particles, to which an electrostatic field produced by a pair of electrodes provided on respective substrates is applied, are made to fly and move so as to display an image. (1) The image display panel has matrix electrodes composed of pairs of electrodes arranged in a matrix manner, a display drive is performed by applying a high potential VH or a low potential VL to respective electrodes constituting the matrix electrodes, and respective electrodes are connected to an intermediate potential V0 between the potentials VH and VL through a small impedance when the potential VH or VL is not applied to respective electrodes.
    Type: Application
    Filed: December 2, 2002
    Publication date: November 24, 2005
    Inventors: Norio Nihei, Koji Takagi, Kazuya Murata, Gaku Yakushiji, Hajime Kitano, Yoshitomo Masuda, Takahiro Kawagoe
  • Publication number: 20050052402
    Abstract: A reversible image display panel which comprises a pair of substrates one of which is transparent and a group of particles charged with single polarity, a group of particles with single color charged with single polarity, a group of particles having portions with different colors and different charge characteristics, or two groups of particles with different charge characteristics each enclosed between the substrates, characterized in applying an electric field across the substrates, and displaying images by flying and moving the particles. The reversible image display panel and the image display device in accordance with the invention have fast response speed and simple structure, being superior in stability and vividity. In an occasion of driving, generation of the strong electric field is unnecessary for them and accordingly, electric circuits can be assembled employing general purpose electronic materials.
    Type: Application
    Filed: November 21, 2002
    Publication date: March 10, 2005
    Inventors: Hajime Kitano, Gaku Yakushiji, Kazuya Murata, Norio Nihei, Koji Takagi, Yoshitomo Masuda, Takahiro Kawagoe
  • Publication number: 20050001810
    Abstract: The present invention intends to provide particles for displaying images used in an image display device capable of displaying and eliminating repeatedly accompanied by flight and movement of particles utilizing Coulomb force, being superior in stability, particularly in repetition durability, memory characteristic stability, adaptability for temperature change, having capability of regulating charge amount, and accordingly, favorable images with sufficient contrast should be stably obtained. The present invention provides particles coated with a resin; specifying Span of particle diameter distribution, charge attenuation property, thermal change of the surface hardness, tensile break strength, Izod impact strength (with a notch), abrasion loss (Taber), tensile elastic modulus, flexural elastic modulus, or tear strength. The present invention also proposes about the structure of the particles.
    Type: Application
    Filed: September 19, 2002
    Publication date: January 6, 2005
    Inventors: Gaku Yakushiji, Hajime Kitano, Kazuya Murata, Norio Nihei, Koji Takagi, Yoshitomo Masuda, Takahiro Kawagoe
  • Patent number: 6814892
    Abstract: An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. of 20 to 50, and which has less compression set and is suitable as a material for a transfer member, a primary transfer member, a secondary transfer member, a cleaning member for image formation bodies, a bias member, a backup member, etc.; an electroconductive ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: November 9, 2004
    Assignee: Bridgestone Corporation
    Inventors: Chikara Yamada, Toshiyuki Osaki, Tadashi Nakajima, Takahiro Kawagoe
  • Publication number: 20030201425
    Abstract: An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. of 20 to 50, and which has less compression set and is suitable as a material for a transfer member, a primary transfer member, a secondary transfer member, a cleaning member for image formation bodies, a bias member, a backup member, etc.; an electroconductive ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C.
    Type: Application
    Filed: April 11, 2003
    Publication date: October 30, 2003
    Applicant: Bridgestone Corporation
    Inventors: Chikara Yamada, Toshiyuki Osaki, Tadashi Nakajima, Takahiro Kawagoe
  • Patent number: 6579473
    Abstract: An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. of 20 to 50, and which has less compression set and is suitable as a material for a transfer member, a primary transfer member, a secondary transfer member, a cleaning member for image formation bodies, a bias member, a backup member, etc.; an electroconductive ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C.
    Type: Grant
    Filed: October 19, 2000
    Date of Patent: June 17, 2003
    Assignee: Bridgestone Corporation
    Inventors: Chikara Yamada, Toshiyuki Osaki, Tadashi Nakajima, Takahiro Kawagoe
  • Patent number: 6572791
    Abstract: There is disclosed an elastic member constituted of polyurethane foam obtained by agitationally mixing with water, a urethane prepolymer synthesized from a polyol and a polyisocyanate, characterized by simultaneously employing as polyols, a (A) polymer polyol synthesized from a polyether polyol as a basis, comprising at least 70% by weight of oxypropylene moiety; and a (B) hydrophilic polyether polyol comprising at least 50% by weight of oxyethylene moiety, or simultaneously employing as polyols, the component (A), the component (B) and a (C) polyether polyol comprising at least 70% by weight of oxypropylene moiety. The above elastic member is simultaneously imparted with excellent characteristics such as low hardness, fine cells, low residual compressive strain, high strength and the like. The polyurethane foam which constitutes the elastic member can be produced by free foaming.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: June 3, 2003
    Assignee: Bridgestone Corporation
    Inventors: Junji Sakata, Hirotaka Yamazaki, Tadashi Nakajima, Takahiro Kawagoe
  • Patent number: 6555210
    Abstract: A new charging member which is durable enough to exhibit stable performance over a long period of time without deterioration by the sticking of toner particles. It is characterized by its surface having a universal hardness no higher than 10 N/mm2 at a depth equivalent to the diameter of toner particles.
    Type: Grant
    Filed: April 14, 1999
    Date of Patent: April 29, 2003
    Assignee: Bridgestone Corporation
    Inventors: Yoshitomo Masuda, Gaku Yakushiji, Takahiro Kawagoe
  • Patent number: 6312792
    Abstract: An electrically conductive member comprising an electrically conductive elastic layer and a coating layer formed thereon, characterized in that said coating layer is formed from a polyurea resin as a cured product resulting from reaction between a polyamine compound and a polyisocyanate compound. It has a coating layer which readily conforms to elastic deformation of rubber or the likes, has long durability, and has good properties in protection of the photosensitive body from staining and prevention of toner sticking, control of the toner charging and a low coefficient of friction.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: November 6, 2001
    Assignee: Bridgestone Corporation
    Inventors: Tokuo Okada, Koji Takagi, Hiroshi Kaneda, Toshiaki Arai, Takahiro Kawagoe
  • Publication number: 20010003757
    Abstract: There is disclosed an elastic member constituted of polyurethane foam obtained by agitationally mixing with water, a urethane prepolymer synthesized from a polyol and a polyisocyanate, characterized by simultaneously employing as polyols, a (A) polymer polyol synthesized from a polyether polyol as a basis, comprising at least 70% by weight of oxypropylene moiety; and a (B) hydrophilic polyether polyol comprising at least 50% by weight of oxyethylene moiety, or simultaneously employing as polyols, the component (A), the component (B) and a (C) polyether polyol comprising at least 70% by weight of oxypropylene moiety. The above elastic member is simultaneously imparted with excellent characteristics such as low hardness, fine cells, low residual compressive strain, high strength and the like. The polyurethane foam which constitutes the elastic member can be produced by free foaming.
    Type: Application
    Filed: December 7, 2000
    Publication date: June 14, 2001
    Applicant: Bridgestone Corporation
    Inventors: Junji Sakata, Hirotaka Yamazaki, Tadashi Nakajima, Takahiro Kawagoe
  • Patent number: 6175709
    Abstract: Disclosed is a toner support for preventing occurrence of an image failure such as stain, uneven image density, and fogging on a white image as much as possible, thereby certainly forming a high quality image enough to keep up with formation of a color image. The toner support is characterized in that the maximum value of a surface potential of the toner support, which is measured after an elapse of 0.35 sec since the surface of the toner support is charged by generating a corona discharge by means of applying a voltage of 8 kV to a corona discharger disposed apart from the surface of the toner support by 1 mm, is in a range of 90 V or less, and that the absolute value of a surface potential decay rate of the toner support, which is measured at an elapse of 0.2 sec after charges are imparted on the surface of the toner support by generating a corona discharge by means of applying a voltage of 8 kV to a corona discharger disposed apart from the surface of the toner support by 1 mm, is in a range of 0.
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: January 16, 2001
    Assignee: Bridgestone Corporation
    Inventors: Koji Takagi, Tokuo Okada, Toshiaki Arai, Takahiro Kawagoe, Takashi Kitamura