Patents by Inventor Ryurou Kurahashi
Ryurou Kurahashi 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: 20210184229Abstract: [Problem] Provided are a metal material including a passive film on a surface and having corrosion resistance while having a small contact resistance, and a method for producing the metal material. Examples of the metal material include a material that is preferable as a material of a separator and a current collector plate in a fuel cell. [Solution] Conductive particles 3 are embedded in and caused to adhere to a metal substrate 1 including, on a surface thereof, a passive film 2, in a state where the conductive particles 3 penetrate the passive film 2 in a thickness direction, and the surface of the metal substrate is covered with a coating film having conductivity and corrosion resistance. To cause the conductive particles to adhere in such a manner, the conductive particles 3 may be scattered on the metal substrate 1 on which the passive film 2 is formed, and the conductive particles 3 may be pushed into the surface of the metal substrate 1 by pressing with a roll or the like.Type: ApplicationFiled: October 24, 2017Publication date: June 17, 2021Inventors: RYUROU KURAHASHI, YOSHIO SHIN, KENJI KAWASAKA, YOSHIHISA FUKUDOME, SHIGEO KAKUDOU
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Patent number: 10773267Abstract: PROBLEM: To provide a large device and a method which is advantageous for forming a large-area amorphous film. SOLUTION: A device of the invention sprays a flame including a particulate material with a spraying machine toward a substrate, melts the material with the flame, and cools the material and flame by cooling gas before they reach the substrate to form an amorphous film. The spraying machine has particulate material spraying ports and flame spraying ports such that the flame including the material has an oblong cross section. Inert gas spraying ports are successively placed on both sides across the ports of the material and flame. Mist spraying ports are successively placed on both sides across the ports for the material, flame and inert gas. A skirt is attached/detached depending on a combustion gas or a film width to restrain film width narrowing and increase of film thickness deviation.Type: GrantFiled: January 10, 2013Date of Patent: September 15, 2020Assignee: USUI CO., LTD.Inventors: Ryurou Kurahashi, Hiroshi Matsumoto, Junji Takehara, Yoshihisa Fukutome
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Patent number: 10323153Abstract: [Problem] To provide a corrosion-resistant coating that exhibits greater corrosion protection in saltwater environments and the like than was conventional, a method for forming the same, and a device for forming the same. [Solution] A corrosion-resistant alloy coating is formed on a substrate surface by: a) using a thermal spray gun, having a function wherein a flame including melted material particles is jetted toward a substrate, and the flame is partitioned from the open air in an upstream region on said jet path (which is to say the region in which the material particles are melted), and a function wherein, in a downstream region (the area continuing from the upstream region), the material particles and the flame are forcibly cooled by a jet-gas or jet-mist before reaching the substrate; and b) using a corrosion-resistant alloy material comprising aluminum, for the material particles.Type: GrantFiled: January 27, 2015Date of Patent: June 18, 2019Assignee: YOSHIKAWA KOGYO CO., LTD.Inventors: Ryurou Kurahashi, Toshiharu Morimoto, Yoshio Shin, Fumiaki Otsubo, Yasuhiro Omori, Takashi Kumai, Yusuke Nishiura, Toshifumi Horita
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Patent number: 10032537Abstract: A thin plate is prepared by an ultraquenching transition control injector with a mixture of a metal powder having corrosion resistance to form a matrix and a powder having conductivity, as a raw material. When the matrix of the thin plate is crystal-structure metal, the plate can be formed at room temperature, and when the matrix is metallic glass, the plate can be formed in a supercooled liquid state. Therefore the plate can be finished into a separator with an intended shape.Type: GrantFiled: May 28, 2013Date of Patent: July 24, 2018Assignees: NAKAYAMA AMORPHOUS CO., LTD., USUI KOKUSAI SANGYO KAISYA, LTD., YAMANAKA ENG. CO., LTD.Inventors: Ryurou Kurahashi, Junji Takehara, Shigeo Kakudou, Tsunehiro Mimura
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Patent number: 9959950Abstract: [Problem] To prepare a thin plate having excellent corrosion resistance, conductivity, and formability at low cost. [Solution] A thin plate is prepared by an ultraquenching transition control injector with a mixture of a metal powder having corrosion resistance to form a matrix and a powder having conductivity, as a raw material. An obtained thin plate has a conductive material component that exists, without dissolving, in a metal matrix exhibiting corrosion resistance by passivation, thereby having aforementioned characteristics.Type: GrantFiled: May 28, 2013Date of Patent: May 1, 2018Assignee: NAKAYAMA AMORPHOUS CO., LTD.Inventors: Manabu Kiuchi, Ryurou Kurahashi, Junji Takehara, Shigeo Kakudou, Tsunehiro Mimura
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Publication number: 20170015838Abstract: [Problem] To provide a corrosion-resistant coating that exhibits greater corrosion protection in saltwater environments and the like than was conventional, a method for forming the same, and a device for forming the same. [Solution] A corrosion-resistant alloy coating is formed on a substrate surface by: a) using a thermal spray gun, having a function wherein a flame including melted material particles is jetted toward a substrate, and the flame is partitioned from the open air in an upstream region on said jet path (which is to say the region in which the material particles are melted), and a function wherein, in a downstream region (the area continuing from the upstream region), the material particles and the flame are forcibly cooled by a jet-gas or jet-mist before reaching the substrate; and b) using a corrosion-resistant alloy material comprising aluminum, for the material particles.Type: ApplicationFiled: January 27, 2015Publication date: January 19, 2017Inventors: Ryurou KURAHASHI, Toshiharu MORIMOTO, Yoshio SHIN, Fumiaki OTSUBO, Yasuhiro OMORI, Takashi KUMAI, Yusuke NISHIURA, Toshifumi HOTTA
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Patent number: 9382604Abstract: An apparatus for forming an amorphous coating film by jetting flame containing particles of a flame spray material from a flame spray gun toward a base material, causing the particles to be melted by the flame, and cooling both the particles and the flame with the means of a cooling gas before they reach the base material. The apparatus includes a tubular member provided among the path along which the flame is jetted that it surrounds the flame passing through a melting zone in which the particles are melted. The tubular member has a flow channel for the cooling gas, formed along and integrally to the tubular member.Type: GrantFiled: January 13, 2010Date of Patent: July 5, 2016Assignee: NAKAYAMA AMORPHOUS CO., LTD.Inventors: Ryurou Kurahashi, Masahiro Komaki, Tsunehiro Mimura
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Publication number: 20150137045Abstract: [Problem] To prepare a thin plate having excellent corrosion resistance, conductivity, and formability at low cost. [Solution] A thin plate is prepared by an ultraquenching transition control injector with a mixture of a metal powder having corrosion resistance to form a matrix and a powder having conductivity, as a raw material. An obtained thin plate has a conductive material component that exists, without dissolving, in a metal matrix exhibiting corrosion resistance by passivation, thereby having aforementioned characteristics.Type: ApplicationFiled: May 28, 2013Publication date: May 21, 2015Applicant: Nakayama Amorphous Co., Ltd.Inventors: Manabu Kiuchi, Ryurou Kurahashi, Junji Takehara, Shigeo Kakudou, Tsunehiro Mimura
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Publication number: 20150111132Abstract: [Problem] To prepare a metallic separator for PEFCs having excellent corrosion resistance, conductivity, and formability at low cost. [Solution] A thin plate is prepared by an ultraquenching transition control injector with a mixture of a metal powder having corrosion resistance to form a matrix and a powder having conductivity, as a raw material. When the matrix of the thin plate is crystal-structure metal, the plate can be formed at room temperature, and when the matrix is metallic glass, the plate can be formed in a supercooled liquid state. Therefore the plate can be finished into a separator with an intended shape.Type: ApplicationFiled: May 28, 2013Publication date: April 23, 2015Inventors: Ryurou Kurahashi, Junji Takehara, Shigeo Kakudou, Tsunehiro Mimura
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Publication number: 20140335283Abstract: PROBLEM: To provide a large device and a method which is advantageous for forming a large-area amorphous film. SOLUTION: A device of the invention sprays a flame including a particulate material with a spraying machine toward a substrate, melts the material with the flame, and cools the material and flame by cooling gas before they reach the substrate to form an amorphous film. The spraying machine has particulate material spraying ports and flame spraying ports such that the flame including the material has an oblong cross section. Inert gas spraying ports are successively placed on both sides across the ports of the material and flame. Mist spraying ports are successively placed on both sides across the ports for the material, flame and inert gas. A skirt is attached/detached depending on a combustion gas or a film width to restrain film width narrowing and increase of film thickness deviation.Type: ApplicationFiled: January 10, 2013Publication date: November 13, 2014Inventors: Ryurou Kurahashi, Hiroshi Matsumoto, Junji Takehara, Yoshihisa Fukutome
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Publication number: 20130263973Abstract: [Problem] To prepare an amorphous alloy as an authentic industrial-use material with a wide range of applications by solving various problems such as delayed fracture and ductility. [Solution] The alloy includes 63 at % or more of Ni and consists only of, as a semimetal for amorphization, other than P. The semimetal may include, for example, 10 to 25 at % of B and one or more of Cr, Mo, and Nb as remaining main elements.Type: ApplicationFiled: October 19, 2011Publication date: October 10, 2013Applicant: Nakayama Steel Works, Ltd.Inventors: Ryurou Kurahashi, Tsunehiro Mimura, Kenji Amiya, Yasunori Saotome
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Publication number: 20130011570Abstract: An apparatus for forming an amorphous coating film by jetting flame containing particles of a flame spray material from a flame spray gun toward a base material, causing the particles to be melted by the flame, and cooling both the particles and the flame with the means of a cooling gas before they reach the base material. The apparatus includes a tubular member provided among the path along which the flame is jetted that it surrounds the flame passing through a melting zone in which the particles are melted. The tubular member has a flow channel for the cooling gas, formed along and integrally to the tubular member.Type: ApplicationFiled: January 13, 2010Publication date: January 10, 2013Applicant: NAKAYAMA STEEL WORKS, LTD.Inventors: Ryurou Kurahashi, Masahiro Komaki, Tsunehiro Mimura
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Publication number: 20090246398Abstract: The present invention provides a method and an apparatus for forming, by spraying, a commonly known amorphous coating film, which is not limited to a metallic glass or the like. According to this invention, a flame containing metal particles is ejected toward a base material from a nozzle, such that the material particles are melted with the flame. Thereafter, the melted material particles and flame are cooled before they reach the base material. For this cooling process, a gas is externally ejected toward the flame, such that the gas can gradually approach the central line of the flame. Preferably, the particle size of the material particles in the flame is within a range of 10 to 100 ?m.Type: ApplicationFiled: August 13, 2007Publication date: October 1, 2009Applicant: NAKAYAMA STEEL WORKS ,LTD.Inventors: Ryurou Kurahashi, Masahiro Komaki, Naoko Nagao
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Publication number: 20090223609Abstract: The present invention provides a new high-strength and Si—Cr containing hot rolled steel plate provided with higher strength as well as excellent workability and a method for manufacturing the steel plate. The high-strength steel plate can be obtained by controlling the particle size of prior austenite to be 10 ?m or less, and properly selecting the coiling temperature. The steel plate obtained includes a retained austenite phase in a volume fraction of 5% to 20%; a martensite phase in a volume fraction equal to or less than 10%; and a bainite phase in the remaining volume fraction. The particle size of the retained austenite particle is 1 ?m or less and the retained austenite particles are dispersed uniformly.Type: ApplicationFiled: April 7, 2008Publication date: September 10, 2009Applicant: NAKAYAMA STEEL WORKS, LTD.Inventors: Kazuaki Hakomori, Yuuji Kusumoto, Fuyuki Yoshida, Ichiro Chikushi, Takashi Ohtani, Ryurou Kurahashi, Masahiko Oda
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Publication number: 20050016242Abstract: A continuous hot-rolling mill includes an upper rolling unit including a plurality of rolling stands, and a lower rolling unit including a plurality of rolling stands and disposed downstream with respect to the upper rolling unit in a workpiece passing direction in which a workpiece to be rolled is passed. The two or more rolling stands of the lower rolling unit are differential or very-small-diameter rolling stands. Each of the two or more differential or very-small-diameter rolling stands of the lower rolling unit is provided with a drive motor having a capacity greater than that of any one of drive motors included in the rolling stands disposed upstream the differential or very-small-diameter rolling stands. The continuous hot-rolling mill is suitable for producing hot-rolled, fine-grained steel sheets and is excellent in sheet passing abilities for preventing the steel sheet from meandering and for rolling the steel sheet in a desired shape.Type: ApplicationFiled: September 30, 2002Publication date: January 27, 2005Inventors: Ryurou Kurahashi, Shinji Ueno, Takayoshi Komatsu, Masanori Takahashi, Akio Adachi, Shinji Takaoka
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Patent number: 5011304Abstract: A rolling bearing, in which at least one of the races and a rolling element of the rolling bearing is made of a raw steel which is free from a Al.sub.2 O.sub.3 or an Al.sub.2 O.sub.3 -base inclusion particle with a 13 .mu.m or more average particle size; but which includes 80 or less Al.sub.2 O.sub.3 or Al.sub.2 O.sub.3 -base inclusion particles with a 3 .mu.m or more average particle size for each tested area of 165 mm.sup.2. The rolling bearing provides a very long life rolling bearing even under the severe conditions of a high bearing, the presence of a deflection in a bearing housing, defective lubrication, etc.Type: GrantFiled: July 19, 1990Date of Patent: April 30, 1991Assignee: Nippon Seiko Kabushiki KaishaInventors: Yasuo Murakami, Yoichi Matsumoto, Shinjiro Ishii, Ryurou Kurahashi, Mitsuru Nakamura