Patents by Inventor Makoto Nakaseko
Makoto Nakaseko 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: 20240011134Abstract: Alloy powder includes particles. The particles include specific particles. Each of the specific particles has a surface layer on which a divided trace is formed, the divided trace being a mark at which molten alloy is divided; and the divided trace has at least a hill-like ridge aggregate structure or a combination of a crater structure and the hill-like ridge aggregate structure, the hill-like ridge aggregate structure being an aggregate of a plurality of hill-like ridges.Type: ApplicationFiled: September 19, 2023Publication date: January 11, 2024Applicant: TOKIN CORPORATIONInventors: Akiri URATA, Yosuke IMANO, Makoto YAMAKI, Naoto ONISHI, Masato KUNO, Takuya TAKASHITA, Makoto NAKASEKO
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Patent number: 11866810Abstract: Alloy powder comprises particles. The particles include specific particles. Each of the specific particles has a surface layer on which a divided trace is formed.Type: GrantFiled: September 16, 2022Date of Patent: January 9, 2024Assignee: TOKIN CORPORATIONInventors: Akiri Urata, Yosuke Imano, Makoto Yamaki, Naoto Onishi, Masato Kuno, Takuya Takashita, Makoto Nakaseko
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Publication number: 20240001441Abstract: A method for producing water-atomized metal powder by dividing a molten metal stream, which is falling in a vertical direction, by spraying cooling water that impinges on the molten metal stream includes a step of spraying the cooling water at a spray pressure of 10 MPa or more and a spread angle in a range of 5° to 30° from each of three or more cooling water discharge ports arranged remote from the falling molten metal stream. The droplet diameter of the cooling water: 100 ?m or less, the convergence angle: 5° to 10°, and the water/molten steel ratio: 50 or more.Type: ApplicationFiled: August 26, 2021Publication date: January 4, 2024Applicant: JFE Steel CorporationInventors: Makoto Nakaseko, Shigeru Unami, Takuya Takashita, Naoki Yamamoto
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Patent number: 11814707Abstract: This soft magnetic powder is represented by composition formula FeaSibBcPdCue with the exception of unavoidable impurities. In the composition formula, a, b, c, d and e satisfy 79?a?84.5 at %, 0?b<6 at %, 4?c?10 at %, 4<d?11 at %, 0.2?e<0.4 at %, and a+b+c+d+e=100 at %.Type: GrantFiled: January 26, 2018Date of Patent: November 14, 2023Assignees: TOKIN CORPORATION, JFE STEEL CORPORATIONInventors: Akiri Urata, Miho Chiba, Mineo Muraki, Makoto Nakaseko, Takuya Takashita
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Patent number: 11795532Abstract: A production method for water-atomized metal powder includes: in a region in which the average temperature of a molten metal stream is higher than the melting point by 100° C. or more, spraying primary cooling water from a plurality of directions at a convergence angle of 10° to 25°, where the convergence angle is an angle between an impact direction on the molten metal stream of the primary cooling water from one direction and an impact direction on the molten metal stream of the primary cooling water from any other direction; and in a region in which 0.0004 seconds or more have passed after an impact of the primary cooling water and the average temperature of metal powder is the melting point or higher and (the melting point+50° C.) or lower, spraying secondary cooling water on the metal powder under conditions of an impact pressure of 10 MPa or more.Type: GrantFiled: October 10, 2019Date of Patent: October 24, 2023Assignee: JFE Steel CorporationInventors: Makoto Nakaseko, Shigeru Unami, Akio Kobayashi, Takuya Takashita
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Publication number: 20230290552Abstract: Provided is an iron-based powder for dust core with which a dust core with low iron loss and high insulation properties can be obtained. In the iron-based powder for dust core of the present disclosure, a median particle size calculated based on cumulative volume frequency of particles of the iron-based powder for dust core is 150 ?m or less, and cumulative volume frequency of the particles with an aspect ratio of 0.70 or less is 70% or less, and a median aspect ratio calculated based on cumulative volume frequency is 0.60 or more.Type: ApplicationFiled: April 27, 2021Publication date: September 14, 2023Applicant: JFE STEEL CORPORATIONInventors: Naoki YAMAMOTO, Takuya TAKASHITA, Makoto NAKASEKO, Shigeru UNAMI
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Publication number: 20230212719Abstract: Provided is an Fe-based nanocrystalline alloy powder. The Fe-based nanocrystalline alloy powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of FeaSibBcPdCueMf, where the M in the composition formula is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %?a?84.5 at %, 0 at %?b<6 at %, 0 at %<c?10 at %, 4 at %<d?11 at %, 0.2 at %?e?0.53 at %, 0 at %?f?4 at %, a+b+c+d+e+f=100 at %, a degree of crystallinity is more than 10% by volume, and an Fe crystallite diameter of the Fe-based nanocrystalline alloy powder is 50 nm or less.Type: ApplicationFiled: February 27, 2023Publication date: July 6, 2023Applicant: JFE STEEL CORPORATIONInventors: Naoki YAMAMOTO, Takuya TAKASHITA, Makoto NAKASEKO, Akio KOBAYASHI, Akiri URATA, Miho CHIBA
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Patent number: 11654487Abstract: A production method for water-atomized metal powder includes: in a region in which the average temperature of a molten metal stream having an Fe concentration of 76.0 at % or more and less than 82.9 at % is 100° C. or more higher than the melting point, spraying primary cooling water at a convergence angle of 10° to 25°, where the convergence angle is an angle between an impact direction on the molten metal stream from one direction and an impact direction on the molten metal stream from any other direction; and in a region in which 0.0004 seconds or more have passed after an impact of the primary cooling water and the average temperature of metal powder is the melting point or higher and (the melting point+100° C.) or lower, spraying secondary cooling water on the metal powder under conditions of an impact pressure of 10 MPa or more.Type: GrantFiled: October 10, 2019Date of Patent: May 23, 2023Assignee: JFE STEEL CORPORATIONInventors: Makoto Nakaseko, Naomichi Nakamura, Akio Kobayashi, Takuya Takashita
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Publication number: 20230085762Abstract: Alloy powder comprises particles. The particles include specific particles. Each of the specific particles has a surface layer on which a divided trace is formed.Type: ApplicationFiled: September 16, 2022Publication date: March 23, 2023Applicant: TOKIN CORPORATIONInventors: Akiri URATA, Yosuke IMANO, Makoto YAMAKI, Naoto ONISHI, Masato KUNO, Takuya TAKASHITA, Makoto NAKASEKO
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Patent number: 11600414Abstract: Provided is a soft magnetic powder that can produce a dust core having excellent magnetic properties. The soft magnetic powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of FeaSibBcPdCueMf, where the M is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %?a?84.5 at %, 0 at %?b<6 at %, 0 at %<c?10 at %, 4 at %<d?11 at %, 0.2 at %?e?0.53 at %, 0 at %?f?4 at %, a+b+c+d+e+f=100 at %, a particle size is 1 mm or less, and a median of circularity of particles constituting the soft magnetic powder is 0.4 or more and 1.0 or less.Type: GrantFiled: July 25, 2019Date of Patent: March 7, 2023Assignee: JFE STEEL CORPORATIONInventors: Naoki Yamamoto, Takuya Takashita, Makoto Nakaseko, Akio Kobayashi, Akiri Urata, Miho Chiba
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Publication number: 20220044859Abstract: Provided is an iron-based powder for dust cores that has high apparent density and enables producing dust cores having high green density. An iron-based powder for dust cores comprises a maximum particle size of 1 mm or less, wherein a median circularity of particles constituting the iron-based powder for dust cores is 0.40 or more, and a uniformity number in Rosin-Rammler equation is 0.30 or more and 90.0 or less.Type: ApplicationFiled: February 10, 2020Publication date: February 10, 2022Applicant: JFE STEEL CORPORATIONInventors: Naoki YAMAMOTO, Takuya TAKASHITA, Makoto NAKASEKO, Akio KOBAYASHI, Shigeru UNAMI
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Publication number: 20210379658Abstract: A production method for water-atomized metal powder includes: in a region in which the average temperature of a molten metal stream is higher than the melting point by 100° C. or more, spraying primary cooling water from a plurality of directions at a convergence angle of 10° to 25°, where the convergence angle is an angle between an impact direction on the molten metal stream of the primary cooling water from one direction and an impact direction on the molten metal stream of the primary cooling water from any other direction; and in a region in which 0.0004 seconds or more have passed after an impact of the primary cooling water and the average temperature of metal powder is the melting point or higher and (the melting point+50° C.) or lower, spraying secondary cooling water on the metal powder under conditions of an impact pressure of 10 MPa or more.Type: ApplicationFiled: October 10, 2019Publication date: December 9, 2021Applicant: JFE Steel CorporationInventors: Makoto Nakaseko, Shigeru Unami, Akio Kobayashi, Takuya Takashita
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Publication number: 20210379657Abstract: A production method for water-atomized metal powder includes: in a region in which the average temperature of a molten metal stream having an Fe concentration of 76.0 at % or more and less than 82.9 at % is 100° C. or more higher than the melting point, spraying primary cooling water at a convergence angle of 10° to 25°, where the convergence angle is an angle between an impact direction on the molten metal stream from one direction and an impact direction on the molten metal stream from any other direction; and in a region in which 0.0004 seconds or more have passed after an impact of the primary cooling water and the average temperature of metal powder is the melting point or higher and (the melting point+100° C.) or lower, spraying secondary cooling water on the metal powder under conditions of an impact pressure of 10 MPa or more.Type: ApplicationFiled: October 10, 2019Publication date: December 9, 2021Applicant: JFE Steel CorporationInventors: Makoto Nakaseko, Naomichi Nakamura, Akio Kobayashi, Takuya Takashita
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Publication number: 20210313101Abstract: Provided is a soft magnetic powder that can produce a dust core having excellent magnetic properties. The soft magnetic powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of FeaSibBcPdCueMf, where the M is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %?a?84.5 at %, 0 at %?b<6 at %, 0 at %<c?10 at %, 4 at %<d?11 at %, 0.2 at %?e?0.53 at %, 0 at %?f?4 at %, a+b+c+d+e+f=100 at %, a particle size is 1 mm or less, and a median of circularity of particles constituting the soft magnetic powder is 0.4 or more and 1.0 or less.Type: ApplicationFiled: July 25, 2019Publication date: October 7, 2021Applicant: JFE STEEL CORPORATIONInventors: Naoki YAMAMOTO, Takuya TAKASHITA, Makoto NAKASEKO, Akio KOBAYASHI, Akiri URATA, Miho CHIBA
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Publication number: 20210031268Abstract: Provided is a method of manufacturing a soft magnetic dust core. The method includes: preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature Tx1 and a second initial crystallization temperature Tx2; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than Tx1?100 K; and heating to a maximum end-point temperature equal to or higher than Tx1?50 K and lower than Tx2 with the compacting pressure being applied.Type: ApplicationFiled: October 21, 2020Publication date: February 4, 2021Applicants: JFE STEEL CORPORATION, JFE PRECISION CORPORATION, TOKIN CORPORATION, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGYInventors: Naomichi NAKAMURA, Makoto NAKASEKO, Takuya TAKASHITA, Mineo MURAKI, Hoshiaki TERAO, Raita WADA, Akiri URATA, Yu KANAMORI, Makoto YAMAKI, Koichi OKAMOTO, Toshinori TSUDA, Shoichi SATO, Kimihiro OZAKI
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Publication number: 20200316688Abstract: [Object] Provided is a method for manufacturing atomized metal powder having a high amorphous material fraction by using a water atomizing method. [Solution] A method for manufacturing atomized metal powder in which atomized metal powder having an amorphous material fraction of 90% or more is obtained, the method including ejecting high-pressure water so as to collide with a molten metal stream flowing vertically downward, separating the molten metal stream into metal powder, and cooling the metal powder, in which the high-pressure water collides with the molten metal with a collision pressure of 20 MPa or higher, and in which a temperature of the molten metal and/or a temperature of the high-pressure water are controlled so that the high-pressure water is in a subcritical state or a supercritical state on a collision surface with the molten metal.Type: ApplicationFiled: December 5, 2018Publication date: October 8, 2020Applicant: JFE Steel CorporationInventors: Makoto Nakaseko, Naomichi Nakamura, Akio Kobayashi, Takuya Takashita
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Patent number: 10589356Abstract: A method for producing a water-atomized metal powder, comprising applying water to a molten metal stream, dividing the molten metal stream into a metal powder, and cooling the metal powder, wherein the metal powder is further subjected to secondary cooling with cooling capacity having a minimum heat flux point (MHF point) higher than the surface temperature of the metal powder in addition to the cooling and the secondary cooling is performed from a temperature range where the temperature of the metal powder after the cooling is not lower than the cooling start temperature necessary for amorphization nor higher than the minimum heat flux point (MHF point).Type: GrantFiled: March 14, 2016Date of Patent: March 17, 2020Assignee: JFE Steel CorporationInventors: Makoto Nakaseko, Yukiko Ozaki, Naomichi Nakamura
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Publication number: 20200001369Abstract: Provided is a method for manufacturing soft magnetic iron powder. A method for manufacturing soft magnetic iron powder, the method including ejecting high-pressure water to collide with a molten metal stream falling vertically downward, breaking up the molten metal stream into metal powder, and cooling the metal powder, in which, when a falling rate of the molten metal stream per unit time is defined as Qm (kg/min) and an ejection rate of high-pressure water per unit time is defined as Qaq (kg/min), a mass ratio (Qaq/Qm) is 50 or more, and a total content of ferrous constituents (Fe, Ni, and Co) is 76 at % or more.Type: ApplicationFiled: January 25, 2018Publication date: January 2, 2020Applicant: JFE Steel CorporationInventors: Makoto NAKASEKO, Naomichi NAKAMURA, Mineo MURAKI, Takuya TAKASHITA
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Publication number: 20190362871Abstract: This soft magnetic powder is represented by composition formula FeaSibBcPdCue with the exception of unavoidable impurities. In the composition formula, a, b, c, d and e satisfy 79?a?84.5 at %, 0?b<6 at %, 4?c?10 at %, 4<d?11 at %, 0.2?e<0.4 at %, and a+b+c+d+e=100 at %.Type: ApplicationFiled: January 26, 2018Publication date: November 28, 2019Applicants: TOKIN CORPORATION, JFE STEEL CORPORATIONInventors: Akiri URATA, Miho CHIBA, Mineo MURAKI, Makoto NAKASEKO, Takuya TAKASHITA
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Patent number: 10293407Abstract: A water-atomized metal powder is produced by dividing a molten metal stream into a metal powder by making injection water having a liquid temperature of 10° C. or less and an injection pressure of 5 MPa or more impinge on the molten metal stream and cooling the metal powder. Cooling with injection water having a liquid temperature of 10° C. or less and an injection pressure of 5 MPa or more enables can be performed not in the film boiling region but in the transition boiling region from the beginning of cooling. A gas-atomized metal powder may also be produced by dividing a molten metal stream into a metal powder by making an inert gas impinge on the molten metal stream and cooling the metal powder with injection water having a liquid temperature of 10° C. or less and an injection pressure of 5 MPa or more.Type: GrantFiled: March 13, 2015Date of Patent: May 21, 2019Assignee: JFE Steel CorporationInventors: Makoto Nakaseko, Naomichi Nakamura, Yukiko Ozaki