Patents by Inventor Kazuhiro Sumioka
Kazuhiro Sumioka 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: 20130302714Abstract: Provided is a porous electrode substrate having excellent thickness precision, gas permeability and conductivity, handling efficiency, low production costs and a high carbonization rate during carbonization. Also provided are a method for manufacturing such a substrate, a precursor sheet and fibrillar fiber used for forming such a substrate, along with a membrane electrode assembly and a polymer electrolyte fuel cell that contain such a substrate. The method for manufacturing a porous electrode substrate includes step (1) for manufacturing a precursor sheet in which short carbon fibers (A) and carbon fiber precursor (b) are dispersed, and step (2) for carbonizing the precursor sheet, and the volume contraction rate of carbon fiber precursor (b) in step (2) is 83% or lower.Type: ApplicationFiled: January 16, 2012Publication date: November 14, 2013Applicant: MITSUBISHI RAYON CO., LTDInventors: Kazuhiro Sumioka, Shigeru Tanoue, Yoshihiro Sako
-
Patent number: 8574758Abstract: The present invention provides a porous electrode substrate that has low production cost, high mechanical strength, thickness precision, and surface smoothness, and sufficient gas permeability and electrical conductivity, and a method for producing the same. In the present invention, for example, a porous electrode substrate that includes short carbon fibers (A) joined together via three-dimensional mesh-like carbon fibers (B) is produced by a method including a step (1) of dispersing short carbon fibers (A), and short carbon fiber precursors (b) to be fibrillated by beating, to produce a precursor sheet; and a step (2) of subjecting the precursor sheet to carbonization treatment at a temperature of 1000° C. or higher.Type: GrantFiled: July 8, 2010Date of Patent: November 5, 2013Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Kazuhiro Sumioka, Yoshihiro Sako
-
Publication number: 20130273454Abstract: Provided is a porous electrode substrate having high mechanical strength, good handling properties, high thickness precision, little undulation, and adequate gas permeability and conductivity. Also provided is a method for producing a porous electrode substrate at low costs. A porous electrode substrate is produced by joining short carbon fibers (A) via mesh-like of carbon fibers (B) having an average diameter of 4 ?m or smaller. Further provided are a membrane-electrode assembly and a polymer electrolyte fuel cell that use this porous electrode membrane. A porous electrode substrate is obtained by subjecting a precursor sheet, in which short carbon fibers (A) and short carbon fiber precursors (b) having an average diameter of 5 ?m or smaller have been dispersed, to carbonization treatment after optional hot press forming and optional oxidization treatment.Type: ApplicationFiled: May 13, 2013Publication date: October 17, 2013Applicant: Mitsubishi Rayon Co., Ltd.Inventors: Kazuhiro Sumioka, Yoshihiro Sako
-
Publication number: 20130224625Abstract: Provided are: a porous electrode substrate which has excellent handling properties and surface smoothness and satisfactory gas permeability and electrical conductivity, and enables the reduction of damage to a polymer electrolyte membrane when integrated into a fuel cell; and a process for producing the porous electrode substrate.Type: ApplicationFiled: October 26, 2011Publication date: August 29, 2013Applicant: MITSUBISHI RAYON CO., LTD.Inventors: Kazuhiro Sumioka, Yoshihiro Sako
-
Publication number: 20120141911Abstract: The provision of a porous electrode substrate that has large sheet strength, low production costs, high handling properties, high thickness precision and surface smoothness, and sufficient gas permeability and electrical conductivity. A porous electrode substrate including a three-dimensional entangled structure including short carbon fibers (A) dispersed in a three-dimensional structure, joined together via three-dimensional mesh-like carbon fibers (B). A method for producing a porous electrode substrate, including a step (1) of producing a precursor sheet including short carbon fibers (A), and short carbon fiber precursors (b) and/or fibrillar carbon fiber precursors (b?) dispersed in a two-dimensional plane; a step (2) of subjecting the precursor sheet to entanglement treatment; and a step (3) of subjecting this sheet to carbonization treatment at 1000° C. or higher. It is preferable to include a step (4) of subjecting the sheet to hot press forming at lower than 200° C.Type: ApplicationFiled: November 22, 2010Publication date: June 7, 2012Applicant: MITSUBISHI RAYON CO., LTDInventors: Kazuhiro Sumioka, Yoshihiro Sako
-
Publication number: 20120115063Abstract: The present invention provides a porous electrode substrate that has high sheet strength, low production cost, and sufficient gas permeability and electrical conductivity, and a method for producing the same. In the present invention, the porous electrode substrate is produced by producing a precursor sheet including short carbon fibers (A), and one or more types of short precursor fibers (b) that undergo oxidation and/or one or more types of fibrillar precursor fibers (b?) that undergo oxidation, all of which are dispersed in a two-dimensional plane, subjecting the precursor sheet to entanglement treatment to form a three-dimensional entangled structure, then impregnating the precursor sheet with carbon powder and fluorine-based resin, and further heat treating the precursor sheet at a temperature of 150° C. or higher and lower than 400° C.Type: ApplicationFiled: November 24, 2010Publication date: May 10, 2012Applicant: MITSUBISHI RAYON CO., LTD.Inventors: Kazuhiro Sumioka, Hiroto Tatsuno
-
Publication number: 20120100456Abstract: The present invention provides a porous electrode substrate that has low production cost, high mechanical strength, thickness precision, and surface smoothness, and sufficient gas permeability and electrical conductivity, and a method for producing the same. In the present invention, for example, a porous electrode substrate that includes short carbon fibers (A) joined together via three-dimensional mesh-like carbon fibers (B) is produced by a method including a step (1) of dispersing short carbon fibers (A), and short carbon fiber precursors (b) to be fibrillated by beating, to produce a precursor sheet; and a step (2) of subjecting the precursor sheet to carbonization treatment at a temperature of 1000° C. or higher.Type: ApplicationFiled: July 8, 2010Publication date: April 26, 2012Applicant: Mitsubishi Rayon Co., Ltd.Inventors: Kazuhiro Sumioka, Yoshihiro Sako
-
Publication number: 20110294036Abstract: Provided is a porous electrode substrate having high mechanical strength, good handling properties, high thickness precision, little undulation, and adequate gas permeability and conductivity. Also provided is a method for producing a porous electrode substrate at low costs. A porous electrode substrate is produced by joining short carbon fibers (A) via mesh-like of carbon fibers (B) having an average diameter of 4 ?m or smaller. Further provided are a membrane-electrode assembly and a polymer electrolyte fuel cell that use this porous electrode membrane. A porous electrode substrate is obtained by subjecting a precursor sheet, in which short carbon fibers (A) and short carbon fiber precursors (b) having an average diameter of 5 ?m or smaller have been dispersed, to carbonization treatment after optional hot press forming and optional oxidization treatment.Type: ApplicationFiled: February 2, 2010Publication date: December 1, 2011Applicant: MITSUBISHI RAYON CO., LTD.Inventors: Kazuhiro Sumioka, Yoshihiro Sako
-
Patent number: 7768193Abstract: There is provided a display element capable of efficiently emitting generated light externally and a method of manufacturing the display element, without damaging an organic electroluminescent layer. First, a transparent electrode protection material (11) is deposited on a first holding substrate (10); then organic electroluminescent light-emitting elements (12, 13, 14) are manufactured thereon; and then after sealing and holding with a sealing material (15) and a second holding substrate (16), the first holding substrate (10) and a transparent electrode protection material (11) are removed by etching or the like. According to the present invention, the removal of the first holding substrate (10) enables improvement of the emission rate generated in the electroluminescent layer (13), and improvement of brightness and contrast in the display element.Type: GrantFiled: August 14, 2008Date of Patent: August 3, 2010Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Tetsuo Tsutsui, Kazuhiro Sumioka
-
Publication number: 20080315758Abstract: There is provided a display element capable of efficiently emitting generated light externally and a method of manufacturing the display element, without damaging an organic electroluminescent layer. First, a transparent electrode protection material (11) is deposited on a first holding substrate (10); then organic electroluminescent light-emitting elements (12, 13, 14) are manufactured thereon; and then after sealing and holding with a sealing material (15) and a second holding substrate (16), the first holding substrate (10) and a transparent electrode protection material (11) are removed by etching or the like. According to the present invention, the removal of the first holding substrate (10) enables improvement of the emission rate generated in the electroluminescent layer (13), and improvement of brightness and contrast in the display element.Type: ApplicationFiled: August 14, 2008Publication date: December 25, 2008Inventors: Tetsuo Tsutsui, Kazuhiro Sumioka
-
Patent number: 7414364Abstract: There is provided a display element capable of efficiently emitting generated light externally and a method of manufacturing the display element, without damaging an organic electroluminescent layer. First, a transparent electrode protection material (11) is deposited on a first holding substrate (10); then organic electroluminescent light-emitting elements (12, 13, 14) are manufactured thereon; and then after sealing and holding with a sealing material (15) and a second holding substrate (16), the first holding substrate (10) and a transparent electrode protection material (11) are removed by etching or the like. According to the present invention, the removal of the first holding substrate (10) enables improvement of the emission rate generated in the electroluminescent layer (13), and improvement of brightness and contrast in the display element.Type: GrantFiled: November 1, 2004Date of Patent: August 19, 2008Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Tetsuo Tsutsui, Kazuhiro Sumioka
-
Publication number: 20080038589Abstract: One porous electrode base material for a polymer electrolyte fuel cell comprises: short carbon fibers which are dispersed in random directions in a substantially two-dimensional plane and have a fiber diameter of 3 to 9 ?m; an amorphous resin carbide which binds said short carbon fibers; and a filamentary resin carbide which further cross-links said short carbon fibers, wherein said porous electrode base material has a thickness of 150 ?m or less. Furthermore, another porous electrode base material for a polymer electrolyte fuel cell comprises: short carbon fibers which are dispersed in random directions in a substantially two-dimensional plane and have a fiber diameter of 3 to 9 ?m; an amorphous resin carbide which binds said short carbon fibers; and a network resin carbide having a minimum fiber diameter of 3 ?m or less which further cross-links said short carbon fibers.Type: ApplicationFiled: June 21, 2005Publication date: February 14, 2008Applicant: Mitsubishi Rayon Co., Ltd.Inventors: Makoto Nakamura, Hidehiko Ohashi, Mitsuo Hamada, Kazushige Mihara, Kazuhiro Sumioka
-
Publication number: 20050088089Abstract: There is provided a display element capable of efficiently emitting generated light externally and a method of manufacturing the display element, without damaging an organic electroluminescent layer. First, a transparent electrode protection material (11) is deposited on a first holding substrate (10); then organic electroluminescent light-emitting elements (12, 13, 14) are manufactured thereon; and then after sealing and holding with a sealing material (15) and a second holding substrate (16), the first holding substrate (10) and a transparent electrode protection material (11) are removed by etching or the like. According to the present invention, the removal of the first holding substrate (10) enables improvement of the emission rate generated in the electroluminescent layer (13), and improvement of brightness and contrast in the display element.Type: ApplicationFiled: November 1, 2004Publication date: April 28, 2005Inventors: Tetsuo Tsutsui, Kazuhiro Sumioka
-
Patent number: 6866555Abstract: There is provided a display element capable of efficiently emitting generated light externally and a method of manufacturing the display element, without damaging an organic electroluminescent layer. First, a transparent electrode protection material (11) is deposited on a first holding substrate (10); then organic electroluminescent light-emitting elements (12, 13, 14) are manufactured thereon; and then after sealing and holding with a sealing material (15) and a second holding substrate (16), the first holding substrate (10) and a transparent electrode protection material (11) are removed by etching or the like. According to the present invention, the removal of the first holding substrate (10) enables improvement of the emission rate generated in the electroluminescent layer (13), and improvement of brightness and contrast in the display element.Type: GrantFiled: July 17, 2001Date of Patent: March 15, 2005Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventors: Tetsuo Tsutsui, Kazuhiro Sumioka
-
Publication number: 20020030770Abstract: There is provided a display element capable of efficiently emitting generated light externally and a method of manufacturing the display element, without damaging an organic electroluminescent layer. First, a transparent electrode protection material (11) is deposited on a first holding substrate (10); then organic electroluminescent light-emitting elements (12, 13, 14) are manufactured thereon; and then after sealing and holding with a sealing material (15) and a second holding substrate (16), the first holding substrate (10) and a transparent electrode protection material (11) are removed by etching or the like. According to the present invention, the removal of the first holding substrate (10) enables improvement of the emission rate generated in the electroluminescent layer (13), and improvement of brightness and contrast in the display element.Type: ApplicationFiled: July 17, 2001Publication date: March 14, 2002Applicant: Semiconductor Energy Laboratory Co., Ltd.Inventors: Tetsuo Tsutsui, Kazuhiro Sumioka