Patents by Inventor Kohei Arakawa

Kohei Arakawa 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: 10533268
    Abstract: A sealing material composition which comprises sheet-like members containing expanded graphite, and which hardly causes the sheet-like members to be broken is provided. A sealing material composition 1 comprises: a stacked body 5; and a long surrounding body 6 which surrounds the stacked body. The stacked body has a plurality of sheet-like members 10 each of which is formed into a tape-like shape by expanded graphite. In the stacked body, the plurality of sheet-like members are stacked in a direction which intersects with the longitudinal direction of the surrounding body, and, in the plurality of sheet-like members, sheet-like members which are adjacent to each other in the stacking direction are disposed to be displaced from each other in the longitudinal direction of the surrounding body, in a relatively movable manner.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: January 14, 2020
    Assignee: Nippon Pillar Packing Co., Ltd.
    Inventors: Kazuyoshi Sato, Kohei Arakawa, Ryoji Hamaguchi, Masaru Fujiwara, Hiroyoshi Nakamitsu
  • Patent number: 10261227
    Abstract: A method for producing a retardation film comprising the steps of: co-extruding or simultaneously casting a thermoplastic resin A and a thermoplastic resin B to obtain a laminated film comprising a layer of the thermoplastic resin A and a layer of the thermoplastic resin B; and uniaxially stretching the laminated film at least twice to cross a molecular orientation axis in the layer of the thermoplastic resin A and a molecular orientation axis in the layer of the thermoplastic resin B each other at almost right angles.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: April 16, 2019
    Assignee: ZEON CORPORATION
    Inventors: Taku Hatano, Kohei Arakawa, Shunsuke Yamanaka
  • Publication number: 20180194122
    Abstract: Disclosed is a heat conductive sheet having sufficiently high levels of heat conductivity, flexibility and strength at the same time. An example of the heat conductive sheet includes a resin, a particulate carbon material, and a fibrous carbon material. An exemplary method of manufacturing the heat conductive sheet includes: shaping a composition containing a resin, a particulate carbon material and a fibrous carbon material into a sheet by pressure application to provide a pre-heat conductive sheet; obtaining a laminate either by laminating the pre-heat conductive sheets on top of each other or by folding or rolling the pre-heat conductive sheet; and slicing the laminate at an angle of 45° or less relative to a lamination direction to provide a heat conductive sheet.
    Type: Application
    Filed: February 4, 2016
    Publication date: July 12, 2018
    Applicant: ZEON CORPORATION
    Inventors: Takurou KUMAMOTO, Kohei ARAKAWA
  • Publication number: 20180119316
    Abstract: A sealing material composition which comprises sheet-like members containing expanded graphite, and which hardly causes the sheet-like members to be broken is provided. A sealing material composition 1 comprises: a stacked body 5; and a long surrounding body 6 which surrounds the stacked body. The stacked body has a plurality of sheet-like members 10 each of which is formed into a tape-like shape by expanded graphite. In the stacked body, the plurality of sheet-like members are stacked in a direction which intersects with the longitudinal direction of the surrounding body, and, in the plurality of sheet-like members, sheet-like members which are adjacent to each other in the stacking direction are disposed to be displaced from each other in the longitudinal direction of the surrounding body, in a relatively movable manner.
    Type: Application
    Filed: October 25, 2017
    Publication date: May 3, 2018
    Applicant: Nippon Pillar Packing Co., Ltd.
    Inventors: Kazuyoshi SATO, Kohei Arakawa, Ryoji Hamaguchi, Masaru Fujiwara, Hiroyoshi Nakamitsu
  • Patent number: 9897849
    Abstract: A protective film for polarizing plate made by laminating k layers (k being an integer of 2 to 7) of thermoplastic resin, in which a refractive index ni(?) at a wavelength X in the range of 380 to 780 nm of the i th thermoplastic resin layer as well as a refractive index ni+1(?) at a wavelength ?in the range of 380 to 780 nm of the i+1 th thermoplastic resin layer have a relationship of In |ni(?)?ni+1(?)|?0.045 (i being an integer of 1 to k?l); and a polarizing plate comprising the protective film and a polarizer. The protective film has an in-plane retardation Re at a wavelength ?of 550 nm of 50 nm or less, and is obtained by coextruding at least one layer (A) of thermoplastic resin having of a negative photoelastic coefficient with at least one layer (B) of thermoplastic resin having a positive photoelastic coefficient.
    Type: Grant
    Filed: June 21, 2006
    Date of Patent: February 20, 2018
    Assignee: Zeon Corporation
    Inventors: Masanori Yoshihara, Tetsuya Toyoshima, Kohei Arakawa
  • Patent number: 9488866
    Abstract: An optical laminate having layer A having a resin having a negative intrinsic birefringence and at least one layer B having a transparent resin, having substantially no orientation and laminated at least on one face of layer A and satisfies a relation |Re(A)|>|Re(B)|, wherein Re(A) and Re(B) represent in-plane retardations of layer A and layer B, respectively, measured with light having a wavelength of 400 to 700 nm, an optical element having a laminate of the optical laminate and a polarizer plate, and a liquid crystal display device using at least one sheet of the optical laminate. In the liquid crystal display device, optical compensation can be made in accordance with the mode of the liquid crystal display by the three dimensional control of the refractive index, and the liquid crystal display device provides an image display with liquid crystals exhibiting small change in the phase contrast depending on the viewing angle.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: November 8, 2016
    Assignee: ZEON CORPORATION
    Inventors: Shunsuke Yamanaka, Kohei Arakawa
  • Publication number: 20150234107
    Abstract: A method for producing a retardation film comprising the steps of: co-extruding or simultaneously casting a thermoplastic resin A and a thermoplastic resin B to obtain a laminated film comprising a layer of the thermoplastic resin A and a layer of the thermoplastic resin B; and uniaxially stretching the laminated film at least twice to cross a molecular orientation axis in the layer of the thermoplastic resin A and a molecular orientation axis in the layer of the thermoplastic resin B each other at almost right angles.
    Type: Application
    Filed: May 1, 2015
    Publication date: August 20, 2015
    Applicant: ZEON CORPORATION
    Inventors: Taku HATANO, Kohei ARAKAWA, Shunsuke YAMANAKA
  • Patent number: 9050763
    Abstract: A method for producing a retardation film comprising the steps of: co-extruding or simultaneously casting a thermoplastic resin A and a thermoplastic resin B to obtain a laminated film comprising a layer of the thermoplastic resin A and a layer of the thermoplastic resin B; and uniaxially stretching the laminated film at least twice to cross a molecular orientation axis in the layer of the thermoplastic resin A and a molecular orientation axis in the layer of the thermoplastic resin B each other at almost right angles.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: June 9, 2015
    Assignee: ZEON CORPORATION
    Inventors: Taku Hatano, Kohei Arakawa, Shunsuke Yamanaka
  • Patent number: 8223304
    Abstract: A liquid crystal display device of an in-plane switching mode comprises at least optically anisotropic members (A) and (B) and a liquid crystal cell disposed between a pair of polarizers having absorption axes disposed approximately perpendicularly to each other, wherein nzA>nyA and nxB>nzB (nxA, nxB: refractive indices (n) in the direction of the in-plane slow axis; nyA, nyB: n in the in-plane direction perpendicular to the above direction; nzA, nzB: n in the direction of thickness, each at 550 nm); the in-plane slow axes of (A) and (B) are approximately parallel or perpendicular to each other; and the in-plane slow axis of (A) is approximately parallel or perpendicular to the absorption axis of a polarizer closer to (A). The antireflection property, scratch resistance and durability are excellent, the angle of field is wide, and uniform display of images with great contrast can be achieved at any angle of observation.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: July 17, 2012
    Assignee: Zeon Corporation
    Inventors: Motohiro Itadani, Shuhei Okude, Shunsuke Yamanaka, Kohei Arakawa
  • Patent number: 8202610
    Abstract: A protective film for polarizing plate comprising k layers (k is an integer of 2 or more) of thermoplastic resin layer laminated, wherein a refractive index ni(380) at a wavelength of 380 nm and a refractive index ni(780) at a wavelength of 780 nm in the i th thermoplastic resin layer as well as a refractive index ni+1(380) at a wavelength of 380 nm and a refractive index ni+1(780) at a wavelength of 780 nm in the i+1 th thermoplastic resin layer have a relationship in ?ni(380)?ni+1(380)|?|ni(780)?ni+1(780)??0.02 (where, i is an integer of 1 to k?1). A polarizing plate is obtained by bonding the protective film for the polarizing plate and a polarizer. And a liquid crystal display comprising the polarizing plate and a liquid crystal panel.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: June 19, 2012
    Assignee: Zeon Corporation
    Inventors: Masanori Yoshihara, Tetsuya Toyoshima, Kohei Arakawa
  • Publication number: 20120133866
    Abstract: A liquid crystal display device of an in-plane switching mode comprises at least optically anisotropic members (A) and (B) and a liquid crystal cell disposed between a pair of polarizers having absorption axes disposed approximately perpendicularly to each other, wherein nzA>nyA and nxB>nzB (nxA, nxB: refractive indices (n) in the direction of the in-plane slow axis; nyA, nyB: n in the in-plane direction perpendicular to the above direction; nzA, nzB: n in the direction of thickness, each at 550 nm); the in-plane slow axes of (A) and (B) are approximately parallel or perpendicular to each other; and the in-plane slow axis of (A) is approximately parallel or perpendicular to the absorption axis of a polarizer closer to (A). The antireflection property, scratch resistance and durability are excellent, the angle of field is wide, and uniform display of images with great contrast can be achieved at any angle of observation.
    Type: Application
    Filed: February 2, 2012
    Publication date: May 31, 2012
    Inventors: Motohiro Itadani, Shuhei Okude, Shunsuke Yamanaka, Kohei Arakawa
  • Patent number: 8134666
    Abstract: A liquid crystal display device of an in-plane switching mode comprises at least optically anisotropic members (A) and (B) and a liquid crystal cell disposed between a pair of polarizers having absorption axes disposed approximately perpendicularly to each other, wherein nzA>nyA and nxB>nzB (nxA, nxB: refractive indices (n) in the direction of the in-plane slow axis; nyA, nyB: n in the in-plane direction perpendicular to the above direction; nzA, nzB: n in the direction of thickness, each at 550 nm); the in-plane slow axes of (A) and (B) are approximately parallel or perpendicular to each other; and the in-plane slow axis of (A) is approximately parallel or perpendicular to the absorption axis of a polarizer closer to (A). The antireflection property, scratch resistance and durability are excellent, the angle of field is wide, and uniform display of images with great contrast can be achieved at any angle of observation.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: March 13, 2012
    Assignee: Zeon Corporation
    Inventors: Motohiro Itadani, Shuhei Okude, Shunsuke Yamanaka, Kohei Arakawa
  • Publication number: 20110261298
    Abstract: A protective film for polarizing plate comprising k layers (k is an integer of 2 or more) of thermoplastic resin layer laminated, wherein a refractive index ni(380) at a wavelength of 380 nm and a refractive index ni(780) at a wavelength of 780 nm in the i th thermoplastic resin layer as well as a refractive index ni+1(380) at a wavelength of 380 nm and a refractive index ni+1(780) at a wavelength of 780 nm in the i+1 th thermoplastic resin layer have a relationship in ||ni(380)?ni+1(380)|?|ni(780)?ni+1(780)||?0.02 (where, i is an integer of 1 to k?1). A polarizing plate is obtained by bonding the protective film for the polarizing plate and a polarizer. And a liquid crystal display comprising the polarizing plate and a liquid crystal panel.
    Type: Application
    Filed: July 11, 2011
    Publication date: October 27, 2011
    Inventors: Masanori YOSHIHARA, Tetsuya TOYOSHIMA, Kohei ARAKAWA
  • Patent number: 7998563
    Abstract: A protective film for polarizing plate comprising k layers (k is an integer of 2 or more) of thermoplastic resin layer laminated, wherein a refractive index ni(380) at a wavelength of 380 nm and a refractive index ni(780) at a wavelength of 780 nm in the i th thermoplastic resin layer as well as a refractive index ni+1(380) at a wavelength of 380 nm and a refractive index ni+1(780) at a wavelength of 780 nm in the i+1 th thermoplastic resin layer have a relationship in ?ni(380)?ni+1(380)|?|ni(780)?ni+1(780)??0.02 (where, i is an integer of 1 to k?1). A polarizing plate is obtained by bonding the protective film for the polarizing plate and a polarizer. And a liquid crystal display comprising the polarizing plate and a liquid crystal panel.
    Type: Grant
    Filed: June 21, 2006
    Date of Patent: August 16, 2011
    Assignee: Zeon Corporation
    Inventors: Masanori Yoshihara, Tetsuya Toyoshima, Kohei Arakawa
  • Patent number: 7964251
    Abstract: A liquid crystal display device of an in-plane switching mode comprises a pair of polarizing plates which are constituted with a polarizing plate at the output side comprising a polarizer at the output side and a polarizing plate at the incident side comprising a polarizer at the incident side having a transmission axis approximately perpendicular to a transmission axis of the polarizer at the output side and two or more sheets of optically anisotropic members and liquid crystal cells disposed between the pair of polarizing plates. The device exhibits excellent scratch resistance and excellent quality of black depth and uniform and high contrast in viewing at any angles.
    Type: Grant
    Filed: December 26, 2005
    Date of Patent: June 21, 2011
    Assignee: Panasonic Electric Works Co., Ltd.
    Inventors: Takeyuki Yamaki, Hiroshi Yokogawa, Akira Tsujimoto, Ryozo Fukuzaki, Tetsuya Toyoshima, Masanori Yoshihara, Kohei Arakawa
  • Patent number: 7964254
    Abstract: An optical laminate having layer A having a resin having a negative intrinsic birefringence and at least one layer B having a transparent resin, having substantially no orientation and laminated at least on one face of layer A and satisfies a relation |Re(A)|>|Re(B)|, wherein Re(A) and Re(B) represent in-plane retardations of layer A and layer B, respectively, measured with light having a wavelength of 400 to 700 nm, an optical element having a laminate of the optical laminate and a polarizer plate, and a liquid crystal display device using at least one sheet of the optical laminate. In the liquid crystal display device, optical compensation can be made in accordance with the mode of the liquid crystal display by the three dimensional control of the refractive index, and the liquid crystal display device provides an image display with liquid crystals exhibiting small change in the phase contrast depending on the viewing angle.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: June 21, 2011
    Assignee: Zeon Corporation
    Inventors: Shunsuke Yamanaka, Kohei Arakawa
  • Publication number: 20110116995
    Abstract: An apparatus of the present invention for producing an aligned carbon-nanotube aggregate is an apparatus for producing an aligned carbon-nanotube aggregate by synthesizing the aligned carbon-nanotube aggregate on a base material having a catalyst on a surface thereof, the apparatus including: a formation unit that processes a formation step of causing an environment surrounding the catalyst to be an environment of a reducing gas and heating at least either the catalyst or the reducing gas; a growth unit that processes a growth step of synthesizing the aligned carbon-nanotube aggregate by causing the environment surrounding the catalyst to be an environment of a raw material gas and by heating at least either the catalyst or the raw material gas; and a transfer unit that transfers the base material at least from the formation unit to the growth unit.
    Type: Application
    Filed: January 21, 2011
    Publication date: May 19, 2011
    Inventors: Akiyoshi Shibuya, Keiichi Kawata, Kohei Arakawa, Kenji Hata, Motoo Yumura
  • Publication number: 20110069257
    Abstract: An optical laminate having layer A having a resin having a negative intrinsic birefringence and at least one layer B having a transparent resin, having substantially no orientation and laminated at least on one face of layer A and satisfies a relation |Re(A)|>|Re(B)|, wherein Re(A) and Re(B) represent in-plane retardations of layer A and layer B, respectively, measured with light having a wavelength of 400 to 700 nm, an optical element having a laminate of the optical laminate and a polarizer plate, and a liquid crystal display device using at least one sheet of the optical laminate. In the liquid crystal display device, optical compensation can be made in accordance with the mode of the liquid crystal display by the three dimensional control of the refractive index, and the liquid crystal display device provides an image display with liquid crystals exhibiting small change in the phase contrast depending on the viewing angle.
    Type: Application
    Filed: November 30, 2010
    Publication date: March 24, 2011
    Inventors: Shunsuke YAMANAKA, Kohei Arakawa
  • Patent number: 7897209
    Abstract: An apparatus of the present invention for producing an aligned carbon-nanotube aggregate is an apparatus for producing an aligned carbon-nanotube aggregate by synthesizing the aligned carbon-nanotube aggregate on a base material having a catalyst on a surface thereof, the apparatus including: a formation unit that processes a formation step of causing an environment surrounding the catalyst to be an environment of a reducing gas and heating at least either the catalyst or the reducing gas; a growth unit that processes a growth step of synthesizing the aligned carbon-nanotube aggregate by causing the environment surrounding the catalyst to be an environment of a raw material gas and by heating at least either the catalyst or the raw material gas; and a transfer unit that transfers the base material at least from the formation unit to the growth unit.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: March 1, 2011
    Assignees: Zeon Corporation, National Institute of Advanced Industrial Science and Technology
    Inventors: Akiyoshi Shibuya, Keiichi Kawata, Kohei Arakawa, Kenji Hata, Motoo Yumura
  • Patent number: 7872803
    Abstract: A lengthy grid polarizer film comprising a lengthy resin film and a plurality of grid lines provided on the surface and/or inside of the resin film and extending substantially in parallel with each other are provided, the grid lines being made of a material G being 1.0 or more in the absolute value of the difference between the real part n1 and the imaginary part ?1 of the complex refractive index (N1=n1?i?1), said resin film having a plurality of rows of grooves formed extending substantially in parallel with each other on its surface, and said grid line being made of a thin film of the laminated material G on the bottom face of the grooves and/or on the top face of ridges located between the adjacent grooves. A lengthy optical laminated body comprises the lengthy grid polarizer film and another lengthy polarizing optical film.
    Type: Grant
    Filed: May 29, 2006
    Date of Patent: January 18, 2011
    Assignee: Zeon Corporation
    Inventors: Mitsugu Uejima, Toshihide Murakami, Akiyoshi Shibuya, Megumi Fujita, Masahiko Hayashi, Kohei Arakawa