Patents by Inventor Kazuya Koseki
Kazuya Koseki 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: 20240109123Abstract: The present invention provides an alloy, an alloy powder, an alloy member, and a composite member which are excellent in corrosion resistance and wear resistance, have crack resistance, and are suitable for an additive manufacturing method and the like. An alloy and an alloy powder include, by mass %, Cr: 18 to 22%, Mo: 18 to 28%, Ta: 1.5 to 57%, C: 1.0 to 2.5%, Nb: 0 to 42%, Ti: 0 to 15%, V: 0 to 27%, Zr: 0 to 29%, and a remainder consisting of Ni and unavoidable impurities, where a molar ratio of (Ta+0.7Nb+Ti+0.6V+Zr)/C=0.5 to 1.5 is satisfied. An alloy member is an additively manufactured product or a cast having such a solidification structure, and the solidification structure is a dendrite-like crystal structure having a metal phase having a face-centered cubic structure and carbides.Type: ApplicationFiled: December 8, 2023Publication date: April 4, 2024Applicant: Proterial, Ltd.Inventors: Hiroshi Shiratori, Kazuya Shinagawa, Kousuke Kuwabara, Shuho Koseki
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Patent number: 11948755Abstract: An electrode body which achieves not only high initial capacitance of an electrolyte capacitor but also achieves stable capacitance even after being exposed to high temperature environment, and the electrolyte capacitor including the electrode body are provided. The electrode body is used for a negative electrode of the electrolyte capacitor, and the electrode body includes a negative electrode foil formed by a valve action metal, and a carbon layer formed on the negative electrode foil. The carbon layer includes a first spherical carbon and a second spherical carbon, and the first spherical carbon has a BET specific surface area larger than the second spherical carbon.Type: GrantFiled: June 12, 2020Date of Patent: April 2, 2024Assignee: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya Koseki, Kazuma Okura, Kazuhiro Nagahara
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Publication number: 20240105393Abstract: A cathode and an electrolytic capacitor including the cathode which can suppress production of hydrogen gas are provided. The cathode of the electrolytic capacitor includes cathode foil formed of valve action metal and a conductive layer formed on a surface of the cathode foil. A natural immersion potential of the cathode foil when immersed in an electrolyte solution is at a higher side than a natural immersion potential of reference cathode foil formed of the valve action metal with purity of 99.9%.Type: ApplicationFiled: November 18, 2023Publication date: March 28, 2024Inventors: Kazuhiro NAGAHARA, Tatsuru HATAE, Kazuya KOSEKI, Atsushi YOSHIDA, Makoto TOMINAGA
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Patent number: 11932921Abstract: An object is to provide an alloy composition that has a sufficient melting point for casting of an aluminum alloy, also has high hardness, and can suppress an occurrence of galling. The alloy composition of the present invention includes: a Mo—Cr-based dendritic structure 3; and a Ni—Al-based interdendritic structure 5 that fills a periphery of the Mo—Cr-based dendritic structure 3. The alloy composition of the present invention can adopt a chemical composition I in which when Mo+Cr+Ni+Al=100 at. % holds, Ni+Al=15 to 50 at. % and Mo+Cr=50 to 85 at. % hold; or a chemical composition II in which Ni+Al=40 to 70 at. % and Mo+Cr=30 to 60 at. % hold.Type: GrantFiled: March 27, 2020Date of Patent: March 19, 2024Assignee: HITACHI METALS, LTD.Inventors: Shuho Koseki, Kenichi Inoue, Hiroshi Shiratori, Kazuya Shinagawa
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Patent number: 11929214Abstract: Provided is a hybrid electrolytic capacitor having large capacitance, low ESR, and superior high-frequency characteristics and high-temperature endurance.Type: GrantFiled: December 15, 2020Date of Patent: March 12, 2024Assignee: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya Koseki, Kazuhiro Nagahara, Kenji Machida
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Publication number: 20230360862Abstract: Provided is an electrode body that exhibits a good cathode side capacitance, and an electrolytic capacitor provided with this electrode body. The electrode body used for a cathode of the electrolytic capacitor has a cathode foil and a carbon layer. The cathode foil is made of a valve acting metal, and an enlarged surface layer is formed on the surface thereof. The carbon layer is formed on the enlarged surface layer. The interface between the enlarged surface layer and the carbon layer has an uneven shape.Type: ApplicationFiled: July 20, 2023Publication date: November 9, 2023Inventors: Kazuya Koseki, Kazuma Okura, Kazuhiro Nagahara, Kenji Machida
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Patent number: 11756740Abstract: Provided is an electrode body that exhibits a good cathode side capacitance, and an electrolytic capacitor provided with this electrode body. The electrode body used for a cathode of the electrolytic capacitor has a cathode foil and a carbon layer. The cathode foil is made of a valve acting metal, and an enlarged surface layer is formed on the surface thereof. The carbon layer is formed on the enlarged surface layer. The interface between the enlarged surface layer and the carbon layer has an uneven shape.Type: GrantFiled: June 7, 2019Date of Patent: September 12, 2023Inventors: Kazuya Koseki, Kazuma Okura, Kazuhiro Nagahara, Kenji Machida
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Publication number: 20230029692Abstract: Provided is a solid electrolytic capacitor having large capacitance, low ESR, and superior high-frequency characteristics and high-temperature endurance.Type: ApplicationFiled: December 15, 2020Publication date: February 2, 2023Applicant: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya KOSEKI, Kazuhiro NAGAHARA, Kazuma OKURA
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Publication number: 20230017930Abstract: Provided is a hybrid electrolytic capacitor having large capacitance, low ESR, and superior high-frequency characteristics and high-temperature endurance.Type: ApplicationFiled: December 15, 2020Publication date: January 19, 2023Applicant: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya KOSEKI, Kazuhiro NAGAHARA, Kenji MACHIDA
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Publication number: 20220415582Abstract: Provide is an electrolytic capacitor for a middle-to-high voltage application that is equal to or higher than 100 V which suppresses the total amount of gas to be produced in the electrolytic capacitor. The anode foil of the electrolytic capacitor includes an enlarged surface portion provided with tunnel-shape pits formed from the foil surface in the thickness direction of the foil, and a dielectric oxide film formed on the surface of the enlarged surface portion. The cathode body of the electrolytic capacitor includes a cathode foil formed of a valve acting metal, and a carbon layer formed on the cathode foil.Type: ApplicationFiled: December 16, 2020Publication date: December 29, 2022Inventors: Atsushi YOSHIDA, Makoto TOMINAGA, Kazuhiro NAGAHARA, Kazuya KOSEKI, Tatsuru HATAE
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Publication number: 20220384117Abstract: A cathode and an electrolytic capacitor including the cathode which can suppress production of hydrogen gas are provided. The cathode of the electrolytic capacitor includes cathode foil formed of valve action metal and a conductive layer formed on a surface of the cathode foil. A natural immersion potential of the cathode foil when immersed in an electrolyte solution is at a higher side than a natural immersion potential of reference cathode foil formed of the valve action metal with purity of 99.9%.Type: ApplicationFiled: September 29, 2021Publication date: December 1, 2022Inventors: Kazuhiro NAGAHARA, Tatsuru HATAE, Kazuya KOSEKI, Atsushi YOSHIDA, Makoto TOMINAGA
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Publication number: 20220367122Abstract: A cathode and an electrolytic capacitor including the cathode which can suppress production of hydrogen gas are provided. The cathode of the electrolytic capacitor comprising cathode foil formed of valve action metal, and a conductive layer formed on a surface of the cathode foil. When current in a range of current density of leakage current of the electrolytic capacitor flows by electrochemical polarization, potential corresponding to said current is at a higher side than a natural immersion potential of reference cathode foil formed of the valve action metal with purity of 99.9%.Type: ApplicationFiled: September 29, 2021Publication date: November 17, 2022Inventors: Kazuhiro NAGAHARA, Tatsuru HATAE, Kazuya KOSEKI, Atsushi YOSHIDA, Makoto TOMINAGA
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Publication number: 20220262576Abstract: An electrode body which achieves not only high initial capacitance of an electrolyte capacitor but also achieves stable capacitance even after being exposed to high temperature environment, and the electrolyte capacitor including the electrode body are provided. The electrode body is used for a negative electrode of the electrolyte capacitor, and the electrode body includes a negative electrode foil formed by a valve action metal, and a carbon layer formed on the negative electrode foil. The carbon layer includes a first spherical carbon and a second spherical carbon, and the first spherical carbon has a BET specific surface area larger than the second spherical carbon.Type: ApplicationFiled: June 12, 2020Publication date: August 18, 2022Inventors: Kazuya KOSEKI, Kazuma OKURA, Kazuhiro NAGAHARA
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Patent number: 11348738Abstract: Provided is an electrolytic capacitor that can reliably exhibit redox capacity due to a conductive polymer layer of a cathode. The electrolytic capacitor includes: a cathode having a conductive substrate and a conductive polymer layer placed on the surface of the conductive substrate; an anode having a substrate composed of a valve metal and a dielectric layer composed of an oxide of the valve metal that is placed on the surface of the substrate, the anode being disposed such that the dielectric layer and the conductive polymer layer of the cathode are opposed to each other across a space; and an ion conductive electrolyte with which the space is filled, the conductive polymer layer of the cathode that is in contact with the ion conductive electrolyte exhibiting a redox capacity due to application of a voltage between the anode and the cathode, wherein the contact resistance between the conductive substrate and the conductive polymer layer in the cathode is 1 ?cm2 or less.Type: GrantFiled: October 2, 2018Date of Patent: May 31, 2022Assignee: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya Koseki, Kazuhiro Nagahara, Kenji Machida
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Publication number: 20210202184Abstract: Provided is an electrolytic capacitor that can reliably exhibit redox capacity due to a conductive polymer layer of a cathode. The electrolytic capacitor includes: a cathode having a conductive substrate and a conductive polymer layer placed on the surface of the conductive substrate; an anode having a substrate composed of a valve metal and a dielectric layer composed of an oxide of the valve metal that is placed on the surface of the substrate, the anode being disposed such that the dielectric layer and the conductive polymer layer of the cathode are opposed to each other across a space; and an ion conductive electrolyte with which the space is filled, the conductive polymer layer of the cathode that is in contact with the ion conductive electrolyte exhibiting a redox capacity due to application of a voltage between the anode and the cathode, wherein the contact resistance between the conductive substrate and the conductive polymer layer in the cathode is 1 ?cm2 or less.Type: ApplicationFiled: October 2, 2018Publication date: July 1, 2021Applicant: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya KOSEKI, Kazuhiro NAGAHARA, Kenji MACHIDA
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Publication number: 20210193395Abstract: Provided is an electrode body that exhibits a good cathode side capacitance, and an electrolytic capacitor provided with this electrode body. The electrode body used for a cathode of the electrolytic capacitor has a cathode foil and a carbon layer. The cathode foil is made of a valve acting metal, and an enlarged surface layer is formed on the surface thereof. The carbon layer is formed on the enlarged surface layer. The interface between the enlarged surface layer and the carbon layer has an uneven shape.Type: ApplicationFiled: June 7, 2019Publication date: June 24, 2021Inventors: Kazuya Koseki, Kazuma Okura, Kazuhiro Nagahara, Kenji Machida
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Patent number: 10854393Abstract: Provided is an electrolytic capacitor having a cathode that exhibits a high capacity. The electrolytic capacitor includes: a cathode having a conductive substrate and a conductive polymer layer placed on a surface of the conductive substrate; an anode having a substrate composed of a valve metal and a dielectric layer composed of an oxide of the valve metal that is placed on the surface of the substrate and is so placed that the dielectric layer and the conductive polymer layer of the cathode face each other through a space; and an ion-conductive electrolyte filled in the space, in which the conductive polymer layer of the cathode that is in contact with the ion-conductive electrolyte expresses a redox capacity by applying a voltage between the anode and the cathode.Type: GrantFiled: March 30, 2017Date of Patent: December 1, 2020Assignee: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya Koseki, Kenji Machida
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Patent number: 10566142Abstract: A solid electrolytic capacitor which exhibits excellent characteristics for high voltage applications of 80 WV or more and a method for manufacturing this solid electrolytic capacitor are provided. This solid electrolytic capacitor includes a capacitor element 10 which is obtained by winding an anode foil 1 and a cathode foil 2, with a separator 3 interposed therebetween, the capacitor element 10 includes a solid electrolyte layer, and a void part in the capacitor element 10 is filled with an electrolyte solution, the electrolyte solution contains an ammonium salt of an aliphatic carboxylic acid as a solute and a polyhydric alcohol as a solvent, and the addition amount of the acid serving as the solute relative to the solvent is 0.6 mol/kg or less.Type: GrantFiled: August 5, 2016Date of Patent: February 18, 2020Assignee: Nippon Chemi-Con CorporationInventors: Kenta Sato, Masao Sakakura, Kazuya Koseki
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Publication number: 20190115160Abstract: Provided is an electrolytic capacitor having a cathode that exhibits a high capacity. The electrolytic capacitor includes: a cathode having a conductive substrate and a conductive polymer layer placed on a surface of the conductive substrate; an anode having a substrate composed of a valve metal and a dielectric layer composed of an oxide of the valve metal that is placed on the surface of the substrate and is so placed that the dielectric layer and the conductive polymer layer of the cathode face each other through a space; and an ion-conductive electrolyte filled in the space, in which the conductive polymer layer of the cathode that is in contact with the ion-conductive electrolyte expresses a redox capacity by applying a voltage between the anode and the cathode.Type: ApplicationFiled: March 30, 2017Publication date: April 18, 2019Applicant: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya KOSEKI, Kenji MACHIDA
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Patent number: 10115529Abstract: The present invention provides solid electrolytic capacitor with excellent properties in high-voltage application of 80V or more and a manufacturing method thereof. The solid electrolytic capacitor is manufactured by: forming, in a capacitor element with an anode electrode foil and a cathode electrode foil wound with an interposed separator, a solid electrolyte layer by using a conductive polymer dispersion in which particles of a conductive polymer dispersed in a solvent; and filling voids inside the capacitor element in which the solid electrolyte layer has been formed with an electrolytic solution containing less than 9 wt % of a salt of a composite compound of inorganic acid and organic acid as a solute for filling.Type: GrantFiled: July 22, 2016Date of Patent: October 30, 2018Assignee: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya Koseki, Masao Sakakura