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: 10533268Abstract: 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: GrantFiled: October 25, 2017Date of Patent: January 14, 2020Assignee: Nippon Pillar Packing Co., Ltd.Inventors: Kazuyoshi Sato, Kohei Arakawa, Ryoji Hamaguchi, Masaru Fujiwara, Hiroyoshi Nakamitsu
-
Patent number: 10261227Abstract: 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: GrantFiled: May 1, 2015Date of Patent: April 16, 2019Assignee: ZEON CORPORATIONInventors: Taku Hatano, Kohei Arakawa, Shunsuke Yamanaka
-
Publication number: 20180194122Abstract: 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: ApplicationFiled: February 4, 2016Publication date: July 12, 2018Applicant: ZEON CORPORATIONInventors: Takurou KUMAMOTO, Kohei ARAKAWA
-
Publication number: 20180119316Abstract: 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: ApplicationFiled: October 25, 2017Publication date: May 3, 2018Applicant: Nippon Pillar Packing Co., Ltd.Inventors: Kazuyoshi SATO, Kohei Arakawa, Ryoji Hamaguchi, Masaru Fujiwara, Hiroyoshi Nakamitsu
-
Patent number: 9897849Abstract: 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: GrantFiled: June 21, 2006Date of Patent: February 20, 2018Assignee: Zeon CorporationInventors: Masanori Yoshihara, Tetsuya Toyoshima, Kohei Arakawa
-
Patent number: 9488866Abstract: 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: GrantFiled: November 30, 2010Date of Patent: November 8, 2016Assignee: ZEON CORPORATIONInventors: Shunsuke Yamanaka, Kohei Arakawa
-
Publication number: 20150234107Abstract: 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: ApplicationFiled: May 1, 2015Publication date: August 20, 2015Applicant: ZEON CORPORATIONInventors: Taku HATANO, Kohei ARAKAWA, Shunsuke YAMANAKA
-
Patent number: 9050763Abstract: 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: GrantFiled: February 13, 2009Date of Patent: June 9, 2015Assignee: ZEON CORPORATIONInventors: Taku Hatano, Kohei Arakawa, Shunsuke Yamanaka
-
Patent number: 8223304Abstract: 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: GrantFiled: February 2, 2012Date of Patent: July 17, 2012Assignee: Zeon CorporationInventors: Motohiro Itadani, Shuhei Okude, Shunsuke Yamanaka, Kohei Arakawa
-
Patent number: 8202610Abstract: 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: GrantFiled: July 11, 2011Date of Patent: June 19, 2012Assignee: Zeon CorporationInventors: Masanori Yoshihara, Tetsuya Toyoshima, Kohei Arakawa
-
Publication number: 20120133866Abstract: 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: ApplicationFiled: February 2, 2012Publication date: May 31, 2012Inventors: Motohiro Itadani, Shuhei Okude, Shunsuke Yamanaka, Kohei Arakawa
-
Patent number: 8134666Abstract: 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: GrantFiled: September 16, 2009Date of Patent: March 13, 2012Assignee: Zeon CorporationInventors: Motohiro Itadani, Shuhei Okude, Shunsuke Yamanaka, Kohei Arakawa
-
Publication number: 20110261298Abstract: 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: ApplicationFiled: July 11, 2011Publication date: October 27, 2011Inventors: Masanori YOSHIHARA, Tetsuya TOYOSHIMA, Kohei ARAKAWA
-
Patent number: 7998563Abstract: 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: GrantFiled: June 21, 2006Date of Patent: August 16, 2011Assignee: Zeon CorporationInventors: Masanori Yoshihara, Tetsuya Toyoshima, Kohei Arakawa
-
Patent number: 7964251Abstract: 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: GrantFiled: December 26, 2005Date of Patent: June 21, 2011Assignee: Panasonic Electric Works Co., Ltd.Inventors: Takeyuki Yamaki, Hiroshi Yokogawa, Akira Tsujimoto, Ryozo Fukuzaki, Tetsuya Toyoshima, Masanori Yoshihara, Kohei Arakawa
-
Patent number: 7964254Abstract: 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: GrantFiled: March 22, 2005Date of Patent: June 21, 2011Assignee: Zeon CorporationInventors: Shunsuke Yamanaka, Kohei Arakawa
-
Publication number: 20110116995Abstract: 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: ApplicationFiled: January 21, 2011Publication date: May 19, 2011Inventors: Akiyoshi Shibuya, Keiichi Kawata, Kohei Arakawa, Kenji Hata, Motoo Yumura
-
Publication number: 20110069257Abstract: 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: ApplicationFiled: November 30, 2010Publication date: March 24, 2011Inventors: Shunsuke YAMANAKA, Kohei Arakawa
-
Patent number: 7897209Abstract: 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: GrantFiled: April 2, 2009Date of Patent: March 1, 2011Assignees: Zeon Corporation, National Institute of Advanced Industrial Science and TechnologyInventors: Akiyoshi Shibuya, Keiichi Kawata, Kohei Arakawa, Kenji Hata, Motoo Yumura
-
Patent number: 7872803Abstract: 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: GrantFiled: May 29, 2006Date of Patent: January 18, 2011Assignee: Zeon CorporationInventors: Mitsugu Uejima, Toshihide Murakami, Akiyoshi Shibuya, Megumi Fujita, Masahiko Hayashi, Kohei Arakawa