Patents by Inventor Ryuhei Nakamura
Ryuhei Nakamura 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).
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Publication number: 20230175152Abstract: To provide a manganese-iridium composite oxide, a manganese-iridium composite oxide and a manganese-iridium composite oxide electrode material, having high catalytic activity produced at low cost, to be used as an anode catalyst for oxygen evolution in water electrolysis, and their production methods. A manganese-iridium composite oxide, which has an iridium metal content ratio (iridium/(manganese+indium)) of 0.1 atomic % or more and 30 atomic % or less, and has interplanar spacings of at least 0.243±0.002 nm, 0.214±0.002 nm, 0.165±0.002 nm, 0.140±0.002 nm, and a manganese-iridium composite oxide electrode material comprising an electrically conductive substrate constituted by fibers at least part of which are covered with the above manganese-iridium composite oxide.Type: ApplicationFiled: March 19, 2021Publication date: June 8, 2023Applicants: RIKEN, TOSOH CORPORATIONInventors: Ryuhei NAKAMURA, Nadege BONNET, Shuang KONG, Kazumasa SUETSUGU
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Patent number: 11572630Abstract: The present invention provides a water electrolysis method comprising: supplying at least water into an electrolysis cell which includes a solid polymer electrolyte membrane, and an anode and a cathode disposed sandwiching the solid polymer electrolyte membrane therebetween; and providing a potential P between the anode and the cathode to generate oxygen from the anode, wherein an oxidation catalyst containing at least one of first transition metals is present on at least a part of a surface of the anode, and the potential P satisfies P1<P<P2, wherein P1 indicates a lowest potential at which oxygen is generated from the anode, and P2 indicates a lowest potential P2 at which a quantitative index of a dissolved chemical species derived from the oxidation catalyst begins to show potential dependence.Type: GrantFiled: August 9, 2019Date of Patent: February 7, 2023Assignee: RIKENInventors: Ryuhei Nakamura, Hideshi Ooka, Nadege Bonnet, Ailong Li, Shuang Kong, Hongxian Han
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Publication number: 20220356588Abstract: The present disclosure provides a cathode electrode that can stably sustain a catalytic reaction producing an olefinic hydrocarbon such as ethylene and an alcohol such as ethanol by a reduction reaction of carbon dioxide over a long term. A cathode electrode that electrically reduces carbon dioxide, including cuprous oxide, copper, and at least one additional metal element selected from the group consisting of silver, gold, zinc, and cadmium.Type: ApplicationFiled: July 26, 2022Publication date: November 10, 2022Applicants: RIKEN, CHIYODA CORPORATION, FURUKAWA ELECTRIC CO., LTD.Inventors: Katsushi FUJII, Kayo KOIKE, Ryuhei NAKAMURA, Satoshi WADA, Dai TAKEDA, Jun MATSUMOTO, Eri TORIKAI, Takahiro YAMAMOTO, Yu MIMURA, Kiyoshi YAMAMOTO, Shinsuke NISHIDA
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Publication number: 20210301406Abstract: The present invention provides a water electrolysis method comprising: supplying at least water into an electrolysis cell which includes a solid polymer electrolyte membrane, and an anode and a cathode disposed sandwiching the solid polymer electrolyte membrane therebetween; and providing a potential P between the anode and the cathode to generate oxygen from the anode, wherein an oxidation catalyst containing at least one of first transition metals is present on at least a part of a surface of the anode, and the potential P satisfies P1<P<P2, wherein P1 indicates a lowest potential at which oxygen is generated from the anode, and P2 indicates a lowest potential P2 at which a quantitative index of a dissolved chemical species derived from the oxidation catalyst begins to show potential dependence.Type: ApplicationFiled: August 9, 2019Publication date: September 30, 2021Applicant: RIKENInventors: Ryuhei NAKAMURA, Hideshi OOKA, Nadege BONNET, Ailong LI, Shuang KONG, Hongxian HAN
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Publication number: 20210123151Abstract: A manganese oxide, a manganese oxide/carbon mixture and a manganese oxide composite electrode material, having high catalytic activity produced at low cost, to be used as an anode catalyst for oxygen evolution in water electrolysis, and their production methods, are provided. A manganese oxide for an oxygen evolution electrode catalyst in water electrolysis is provided, which is a manganese oxide having a metallic valence of higher than 3.0 and at most 4.0, having an average primary particle size of at most 80 nm and an average secondary particle size of at most 25 ?m, a manganese oxide/carbon mixture for an oxygen evolution electrode catalyst in water electrolysis, having a proportion of manganese oxide to the total of the manganese oxide and electrically conductive carbon of from 0.5 to 40 wt %, and a manganese oxide composite electrode material which includes an electrically conductive substrate constituted by fibers.Type: ApplicationFiled: December 12, 2018Publication date: April 29, 2021Applicants: RIKEN, TOSOH CORPORATIONInventors: Ryuhei NAKAMURA, Toru HAYASHI, Nadege BONNET, Kazumasa SUETSUGU, Kazuyuki CHIBA
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Patent number: 10077500Abstract: Provided is a catalyst that exhibits a high catalyst activity in a water oxidation reaction within a neutral range. A water splitting catalyst comprises at least one 3d-block transition metal element selected from manganese, iron, cobalt, nickel, and copper or a compound containing the element, and a base and/or a carbonate having a pKa of 8 or less.Type: GrantFiled: March 27, 2015Date of Patent: September 18, 2018Assignee: RIKENInventors: Ryuhei Nakamura, Kazuhito Hashimoto, Akira Yamaguchi, Hirotaka Kakizaki, Toru Hayashi
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Patent number: 9461329Abstract: A power generation system includes a hydrothermal fluid well including a drilled hole reaching down to a hydrothermal fluid reservoir present below an ocean floor from an ocean floor surface and a casing installed in the drilled hole through a guide base on the ocean floor surface, an anode provided on a flow channel for hot water formed by the hydrothermal fluid well, a cathode provided in seawater other than the flow channel for hot water formed by the hydrothermal fluid well, and an ocean floor device that is connected with the anode and the cathode respectively and extracts generated power so as to operate. Power is easily and stably supplied on the ocean floor.Type: GrantFiled: March 22, 2013Date of Patent: October 4, 2016Assignees: Japan Agency for Marine-Earth Science & Technology, The University of TokyoInventors: Masahiro Yamamoto, Ken Takai, Tomokazu Saruhashi, Ikuo Sawada, Junichi Miyazaki, Takazo Shibuya, Kentaro Nakamura, Ryuhei Nakamura, Kazuhito Hashimoto
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Publication number: 20150275379Abstract: Provided is a catalyst that exhibits a high catalyst activity in a water oxidation reaction within a neutral range. A water splitting catalyst comprises at least one 3d-block transition metal element selected from manganese, iron, cobalt, nickel, and copper or a compound containing the element, and a base and/or a carbonate having a pKa of 8 or less.Type: ApplicationFiled: March 27, 2015Publication date: October 1, 2015Applicant: RIKENInventors: Ryuhei NAKAMURA, Kazuhito HASHIMOTO, Akira YAMAGUCHI, Hirotaka KAKIZAKI, Toru HAYASHI
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Patent number: 9116385Abstract: A light source unit base material for manufacturing a plurality of light source units includes a board base material formed in substantially a rectangular shape, and a plurality of light sources provided on the board base material in a row direction and in a column direction and connected electrically in series in the row direction and in the column direction.Type: GrantFiled: October 21, 2010Date of Patent: August 25, 2015Assignee: Sharp Kabushiki KaishaInventors: Katsunori Nagata, Yoshinori Ohhashi, Takayuki Komai, Ryuhei Nakamura
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Publication number: 20150050581Abstract: A power generation system includes a hydrothermal fluid well including a drilled hole reaching down to a hydrothermal fluid reservoir present below an ocean floor from an ocean floor surface and a casing installed in the drilled hole through a guide base on the ocean floor surface, an anode provided on a flow channel for hot water formed by the hydrothermal fluid well, a cathode provided in seawater other than the flow channel for hot water formed by the hydrothermal fluid well, and an ocean floor device that is connected with the anode and the cathode respectively and extracts generated power so as to operate. Power is easily and stably supplied on the ocean floor.Type: ApplicationFiled: March 22, 2013Publication date: February 19, 2015Applicants: Japan Agency for Marine-Earth Science & Technology, The University of TokyoInventors: Masahiro Yamamoto, Ken Takai, Toshikazu Saruhashi, Ikuro Sawada, Junichi Miyazaki, Takazo Shibuya, Kentaro Nakamura, Ryuhei Nakamura, Kazuhito Hashimoto
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Patent number: 8852765Abstract: It is an object of the present invention to provide a microbial fuel cell capable of increasing a current density without employing a mediator. The microbial fuel cell 1 includes a 3-dimensionally structured agglomerate formed from conductive fine particles 2 and microorganisms 3. In the agglomerate 4, the conductive fine particles 2 disperse among pieces of Shewanella 3 and the conductive fine particles 2 are coupled to one another to hold Shewanella 3, thus forming the 3-dimensional structure as a whole. Accordingly, with respect to Shewanella 3, conductive fine particles 2 hold Shewanella 3a on a surface of an electrode 103 and even Shewanella 3b positioned vertically away from the surface of the electrode 103. Hence, it becomes possible that more pieces of Shewanella 3 are allowed to transfer electrons.Type: GrantFiled: March 27, 2009Date of Patent: October 7, 2014Assignees: Japan Science and Technology Agency, The University of TokyoInventors: Kazuhito Hashimoto, Ryuhei Nakamura, Fumiyoshi Kai, Kazuya Watanabe, Soichiro Kato
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Patent number: 8830422Abstract: Provided is an edge-light illuminating device in which a deformation is prevented from occurring in a reflection sheet due to thermal expansion of the reflection sheet. An edge-light illuminating device (3) of the present invention is arranged to illuminate a liquid crystal display panel (2) from a back side of the panel, and includes a light guide plate (7), a light source (5) that faces an edge face (72) of the plate and is arranged to project light onto the edge face, a case (4) arranged to house the plate and the light source, and a reflection sheet (6) laid on a bottom face (41) of the case and sandwiched between the bottom face and a back face (71) of the plate housed in the case, wherein the reflection sheet includes a slot portion (61) disposed along a direction that the reflection sheet expands by heat generated by the light source.Type: GrantFiled: October 14, 2010Date of Patent: September 9, 2014Assignee: Sharp Kabushiki KaishaInventor: Ryuhei Nakamura
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Publication number: 20130002979Abstract: Provided is an edge-light illuminating device in which a deformation is prevented from occurring in a reflection sheet due to thermal expansion of the reflection sheet. An edge-light illuminating device (3) of the present invention is arranged to illuminate a liquid crystal display panel (2) from a back side of the panel, and includes a light guide plate (7), a light source (5) that faces an edge face (72) of the plate and is arranged to project light onto the edge face, a case (4) arranged to house the plate and the light source, and a reflection sheet (6) laid on a bottom face (41) of the case and sandwiched between the bottom face and a back face (71) of the plate housed in the case, wherein the reflection sheet includes a slot portion (61) disposed along a direction that the reflection sheet expands by heat generated by the light source.Type: ApplicationFiled: October 14, 2010Publication date: January 3, 2013Applicant: Sharp Kabushiki KaishaInventor: Ryuhei Nakamura
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Publication number: 20120218479Abstract: A light source unit base material for manufacturing a plurality of light source units includes a board base material formed in substantially a rectangular shape, and a plurality of light sources provided on the board base material in a row direction and in a column direction and connected electrically in series in the row direction and in the column direction.Type: ApplicationFiled: October 21, 2010Publication date: August 30, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Katsunori Nagata, Yoshinori Ohhashi, Takayuki Komai, Ryuhei Nakamura
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Patent number: 8153547Abstract: This invention provides a photocatalyst material, which can be produced at low cost without using platinum, particularly a visible light response-type photocatalyst material, a material having a photocatalyst mechanism not possessed by the conventional photocatalyst material, a process for producing the material, and a method for decomposing a contaminant using the material. The photocatalyst material comprises a) an oxide of a first metal and b) an aqua complex salt of a second metal. In this case, for the oxide of a first metal, the redox potential of a conduction band lower end in the oxide is on a rather negative side than 0.2 V (a value as measured at pH=0, vs. reference electrode potential). For the aqua complex salt of a second metal, the redox potential of a second metal ion in the aqua complex salt is on a rather negative side than 3.0 V (a value as measured at pH=0, vs. reference electrode potential).Type: GrantFiled: June 4, 2008Date of Patent: April 10, 2012Assignee: The University of TokyoInventors: Kazuhito Hashimoto, Hiroshi Irie, Ryuhei Nakamura, Shuhei Miura
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Publication number: 20110236725Abstract: It is an object of the present invention to provide a microbial fuel cell capable of increasing a current density without employing a mediator. The microbial fuel cell 1 includes a 3-dimensionally structured agglomerate formed from conductive fine particles 2 and microorganisms 3. In the agglomerate 4, the conductive fine particles 2 disperse among pieces of Shewanella 3 and the conductive fine particles 2 are coupled to one another to hold Shewanella 3, thus forming the 3-dimensional structure as a whole. Accordingly, with respect to Shewanella 3, conductive fine particles 2 hold Shewanella 3a on a surface of an electrode 103 and even Shewanella 3b positioned vertically away from the surface of the electrode 103. Hence, it becomes possible that more pieces of Shewanella 3 are allowed to transfer electrons.Type: ApplicationFiled: March 27, 2009Publication date: September 29, 2011Applicants: Japan Science and Technology Agency, The University of TokyoInventors: Kazuhito Hashimoto, Ryuhei Nakamura, Fumiyoshi Kai, Kazuya Watanabe, Soichiro Kato
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Publication number: 20110129298Abstract: This invention provides a photocatalyst material, which can be produced at low cost without using platinum, particularly a visible light response-type photocatalyst material, a material having a photocatalyst mechanism not possessed by the conventional photocatalyst material, a process for producing the material, and a method for decomposing a contaminant using the material. The photocatalyst material comprises a) an oxide of a first metal and b) an aqua complex salt of a second metal. In this case, for the oxide of a first metal, the redox potential of a conduction band lower end in the oxide is on a rather negative side than 0.2 V (a value as measured at pH=0, vs. reference electrode potential). For the aqua complex salt of a second metal, the redox potential of a second metal ion in the aqua complex salt is on a rather negative side than 3.0 V (a value as measured at pH=0, vs. reference electrode potential).Type: ApplicationFiled: June 4, 2008Publication date: June 2, 2011Applicant: The University of TokyoInventors: Kazuhito Hashimoto, Hiroshi Irie, Ryuhei Nakamura, Shuhei Miura
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Publication number: 20080105535Abstract: A new photocatalyst, which is high in visible light response, is great in quantum efficiency, and is more excellent in photocatalytic activity, is provided. A composite metal oxide, prepared combining two photocatalytic systems of TiO2 and BiVO4, including elements of Bi, Ti, and Vi as composition elements, can be a photocatalyst having a high activity under visible light. Particularly, BiTiVO6, which is obtained at a compounding ratio of 1:1, can be a photocatalyst having a remarkably high activity under visible light. Moreover, a composite metal oxide expressed by a general formula BiTiMO6 (in the formula, M represents at least one element selected from a group consisting of V, Nb, and Ta) can be a photocatalyst having a high activity under visible light.Type: ApplicationFiled: December 13, 2005Publication date: May 8, 2008Applicants: Osaka University, The New Industry Research OrganizationInventors: Yoshihiro Nakato, Haimei Liu, Ryuhei Nakamura