Patents by Inventor Seigo Tokoro
Seigo Tokoro 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: 20190108931Abstract: A soft magnetic alloy contains a main component having a composition formula of (Fe(1?(???))X1?X2?)1?(a+b+c+d))MaBbPcCd and auxiliary components including at least Ti, Mn and Al. In the composition formula, X1 is one or more selected from the group consisting of Co and Ni, X2 is one or more selected from the group consisting of Ag, Zn, Sn, As, Sb, Bi and a rare earth element, and M is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Mo, W and V. In the composition formula, 0.030?a?0.100, 0.050?b?0.150, 0?c?0.030, 0?d?0.030, ??0, ??0, and 0??+??0.50 are satisfied. In the soft magnetic alloy, a content of Ti is 0.001 to 0.100 wt %, a content of Mn is 0.001 to 0.150 wt %, and a content of Al is 0.001 to 0.100 wt %.Type: ApplicationFiled: September 28, 2018Publication date: April 11, 2019Applicant: TDK CORPORATIONInventors: Akihiro HARADA, Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Seigo TOKORO, Masakazu HOSONO, Takuma NAKANO, Satoko MORI
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Publication number: 20180247746Abstract: Provided is a soft magnetic alloy including Fe, as a main component, and including B. Among 80000 pieces of a grid having 1 nm×1 nm×1 nm in a continuous measurement range of the soft magnetic alloy, 4000 pieces of the grid from lower Fe content shows B content variation (?B) of 2.8 or more, and an amorphization ratio X of the soft magnetic alloy of 85% or more.Type: ApplicationFiled: February 26, 2018Publication date: August 30, 2018Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Kenji HORINO, Akito HASEGAWA, Yu YONEZAWA, Syota GOTO, Seigo TOKORO
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Publication number: 20180247744Abstract: Provided is a soft magnetic alloy including Fe as a main component, in which a slope of an approximate straight line, plotted between cumulative frequencies of 20 to 80% on Fe content in each grid of 80000 grids or more, each of which has 1 nm×1 nm×1 nm, is ?0.1 to ?0.4, provided that Fe content (atom %) of each grid is Y axis, and the cumulative frequencies (%) obtained in descending order of Fe content in each grid is X axis, and an amorphization ratio X is 85% or more.Type: ApplicationFiled: February 26, 2018Publication date: August 30, 2018Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Kenji HORINO, Akito HASEGAWA, Yu YONEZAWA, Syota GOTO, Seigo TOKORO
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Publication number: 20180218810Abstract: A soft magnetic alloy including a main component having a compositional formula of (Fe(1?(?+?))X1?X2?)(1?(a+b+c))MaBbPc, and a sub component including at least C, S and Ti, wherein X1 is one or more selected from the group including Co and Ni, X2 is one or more selected from the group including Al, Mn, Ag, Zn, Sn, As, Sb, Bi, and rare earth elements, “M” is one or more selected from the group including Nb, Hf, Zr, Ta, Mo, W, and V, 0.020?a?0.14, 0.020?b?0.20, 0?c?0.040, ??0, ??0, and 0??+??0.50 are satisfied, when entire said soft magnetic alloy is 100 wt %, a content of said C is 0.001 to 0.050 wt %, a content of said S is 0.001 to 0.050 wt %, and a content of said Ti is 0.001 to 0.080 wt %, and when a value obtained by dividing the content of said C by the content of said S is C/S, then C/S satisfies 0.10?C/S?10.Type: ApplicationFiled: January 26, 2018Publication date: August 2, 2018Applicant: TDK CORPORATIONInventors: Akihiro HARADA, Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Seigo TOKORO, Shota OTSUKA
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Publication number: 20180218813Abstract: A soft magnetic alloy comprising a main component having a compositional formula of ((Fe(1?(?+?))X1?X2?)(1?(a+b+c))MaBbCrc)1?dCd, and a sub component including P, S and Ti, wherein X1 is selected from the group Co and Ni, X2 is selected from the group Al, Mn, Ag, Zn, Sn, As, Sb, Bi and rare earth elements, “M” is selected from the group Nb, Hf, Zr, Ta, Mo, W and V, 0.030?a?0.14, 0.005?b?0.20, 0<c?0.040, 0?d?0.040, ??0, ??0, and 0??+??0.50 are satisfied, when soft magnetic alloy is 100 wt %, P is 0.001 to 0.050 wt %, S is 0.001 to 0.050 wt %, and Ti is 0.001 to 0.080 wt %, and when a value obtained by dividing P by S is P/S, then P/S satisfies 0.10?P/S?10.Type: ApplicationFiled: January 26, 2018Publication date: August 2, 2018Applicant: TDK CORPORATIONInventors: Akihiro HARADA, Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Seigo TOKORO
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Publication number: 20180218811Abstract: A soft magnetic alloy comprising a main component having a compositional formula of ((Fe(1?(?+?))X1?X2?)(1?(a+b))MaBb)1?cCc, and a sub component including P, S and Ti, wherein X1 is selected from the group Co and Ni, X2 is selected from the group Al, Mn, Ag, Zn, Sn, As, Sb, Bi, and rare earth elements, “M” is one or more selected from the group Nb, Hf, Zr, Ta, Mo, W, and V, 0.030?a?0.14, 0.005?b?0.20, 0?c?0.040, ??0, ??0, and 0??+??0.50 are satisfied, when magnetic alloy is 100 wt %, P is 0.001 to 0.050 wt %, S is 0.001 to 0.050 wt %, and Ti is 0.001 to 0.080 wt %, and when a value obtained by dividing P by S is P/S, then P/S satisfies 0.10?P/S?10.Type: ApplicationFiled: January 26, 2018Publication date: August 2, 2018Applicant: TDK CORPORATIONInventors: Akihiro HARADA, Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Seigo TOKORO
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Publication number: 20180218812Abstract: A soft magnetic alloy including a compositional formula of ((Fe(1?(?+?))X1?X2?)(1?(a+b+c+e))MaBbPcCue)1?fCf, wherein X1 is one or more selected from the group consisting Co and Ni, X2 is one or more selected from the group consisting of Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements, “M” is one or more selected from the group consisting of Nb, Hf, Zr, Ta, Ti, Mo, W, and V, 0.030<a?0.14, 0.028?b?0.20, 0?c?0.030, 0<e?0.030, 0<f?0.040, ??0, ??0, and 0??+??0.50 are satisfied.Type: ApplicationFiled: January 26, 2018Publication date: August 2, 2018Applicant: TDK CORPORATIONInventors: Akihiro HARADA, Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Seigo TOKORO, Shota OTSUKA
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Publication number: 20180122543Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1?(?+?))X1?X2?)(1?(a+b+d+e))MaBbCrdCue)1?fCf. X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.030?a?0.14, 0.028?b?0.15, 0.005?d?0.020, 0<e?0.030, 0?f?0.040, ??0, ??0, and 0??+??0.50 are satisfied.Type: ApplicationFiled: October 26, 2017Publication date: May 3, 2018Applicant: TDK CORPORATIONInventors: Akihiro HARADA, Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Masahito KOEDA, Seigo TOKORO
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Publication number: 20180122542Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1-(?+?))X1?X2?)(1-(a+b+c+d+e))MaBbPcCrdCue)1-fCf. X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.030?a?0.14, 0.028?b?0.20, 0<c?0.014, 0<d?0.040, 0?e?0.030, 0?f?0.040, ??0, ??0, and 0??+??0.50 are satisfied.Type: ApplicationFiled: October 26, 2017Publication date: May 3, 2018Applicant: TDK CORPORATIONInventors: Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akihiro HARADA, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Masahito KOEDA, Seigo TOKORO
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Publication number: 20180122540Abstract: A soft magnetic alloy including a composition having a formula of ((Fe(1-(?+?))X1?X2?)(1-(a+b+c+d+e))MaBbPcCrdCue)1-fCf. X1 is one or more elements selected from a group of Co and Ni. X2 is one or more elements selected from a group of W, Al, Mn, Ag, Zn, Sn, As, Sb, Bi, N, O, and rare earth elements. M is one or more elements selected from a group of Nb, Hf, Zr, Ta, Ti, Mo, and V. 0.020?a?0.060, 0.020?b?0.060, 0?c?0.030, 0?d?0.050, 0?e?0.030, 0<f?0.040, ??0, ??0, and 0??+??0.50 are satisfied.Type: ApplicationFiled: October 26, 2017Publication date: May 3, 2018Applicant: TDK CORPORATIONInventors: Hiroyuki MATSUMOTO, Kenji HORINO, Kazuhiro YOSHIDOME, Akihiro HARADA, Akito HASEGAWA, Hajime AMANO, Kensuke ARA, Masahito KOEDA, Seigo TOKORO
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Publication number: 20180096765Abstract: A soft magnetic alloy includes a main component of Fe. The soft magnetic alloy includes a Fe composition network phase where regions whose Fe content is larger than an average composition of the soft magnetic alloy are linked. The Fe composition network phase contains Fe content maximum points that are locally higher than their surroundings in 400,000/?m3 or more. A ratio of Fe content maximum points whose coordination number is 1 or more and 5 or less is 80% or more and 100% or less with respect to all of the Fe content maximum points.Type: ApplicationFiled: September 28, 2017Publication date: April 5, 2018Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Yu YONEZAWA, Syota GOTO, Hideaki YOKOTA, Akito HASEGAWA, Masahito KOEDA, Seigo TOKORO
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Publication number: 20180096766Abstract: A soft magnetic alloy includes a main component of Fe. The soft magnetic alloy includes a Fe composition network phase where regions whose Fe content is larger than an average composition of the soft magnetic alloy are linked. The Fe composition network phase contains Fe content maximum points that are locally higher than their surroundings. A virtual-line total distance per 1 ?m3 of the soft magnetic alloy is 10 mm to 25 mm provided that the virtual-line total distance is a sum of virtual lines linking the maximum points adjacent each other. A virtual-line average distance that is an average distance of the virtual lines is 6 nm or more and 12 nm or less.Type: ApplicationFiled: September 28, 2017Publication date: April 5, 2018Applicant: TDK CORPORATIONInventors: Kazuhiro YOSHIDOME, Hiroyuki MATSUMOTO, Yu YONEZAWA, Syota GOTO, Hideaki YOKOTA, Akito HASEGAWA, Masahito KOEDA, Seigo TOKORO
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Patent number: 9318244Abstract: A soft magnetic powder core which can have a high electrical resistivity, a high magnetic flux density and a high strength easily, and the soft magnetic powder core can be used in various electromagnetic components such as a motor, an actuator, a generator and a reactor. The soft magnetic powder core in which the glass portion is scattered among the soft magnetic particles, the soft magnetic particle having the core particle with iron as the main component and the insulating coating layer containing P, O and Fe. Further, the junction portion with iron oxide as the main component is formed between the soft magnetic particle and the glass portion.Type: GrantFiled: February 4, 2013Date of Patent: April 19, 2016Assignee: TDK CORPORATIONInventors: Takeshi Takahashi, Seigo Tokoro, Seiichi Kikuchi, Kenichi Nishikawa
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Patent number: 9180517Abstract: A powder magnetic core having a high electrical resistivity and a high magnetic flux density, including at least a composite magnetic particle the composite magnetic particle including: a core particle containing iron as the main component; and an insulating passivation layer formed on the core particle, wherein: the insulating passivation layer at least has an inner layer formed on the core particle and the outermost layer formed on the inner layer; and the outermost layer contains iron oxide as the main component.Type: GrantFiled: September 21, 2011Date of Patent: November 10, 2015Assignee: TDK CORPORATIONInventors: Takeshi Takahashi, Seigo Tokoro
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Publication number: 20150021512Abstract: A soft magnetic powder core which can have a high electrical resistivity, a high magnetic flux density and a high strength easily, and the soft magnetic powder core can be used in various electromagnetic components such as a motor, an actuator, a generator and a reactor. The soft magnetic powder core in which the glass portion is scattered among the soft magnetic particles, the soft magnetic particle having the core particle with iron as the main component and the insulating coating layer containing P, O and Fe. Further, the junction portion with iron oxide as the main component is formed between the soft magnetic particle and the glass portion.Type: ApplicationFiled: February 4, 2013Publication date: January 22, 2015Inventors: Takeshi Takahashi, Seigo Tokoro, Seiichi Kikuchi, Kenichi Nishikawa
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Publication number: 20120082844Abstract: A powder magnetic core having a high electrical resistivity and a high magnetic flux density, including at least a composite magnetic particle the composite magnetic particle including: a core particle containing iron as the main component; and an insulating passivation layer formed on the core particle, wherein: the insulating passivation layer at least has an inner layer formed on the core particle and the outermost layer formed on the inner layer; and the outermost layer contains iron oxide as the main component.Type: ApplicationFiled: September 21, 2011Publication date: April 5, 2012Applicant: TDK CORPORATIONInventors: Takeshi TAKAHASHI, Seigo TOKORO
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Publication number: 20110097584Abstract: It is an object to provide a novel soft magnetic material that enables the fabrication of a powder magnetic core capable of suppressing degradation in performance due to a high-temperature treatment and achieving high core resistance and low loss. A soft magnetic material comprising: a core particle each having a soft magnetic particle comprising iron as a main component and an insulating film formed on a surface of the soft magnetic particle; and a coating layer formed on the core particle, wherein the coating layer comprises a metal complex having nonferrous central metal and at least one organic ligand.Type: ApplicationFiled: October 14, 2010Publication date: April 28, 2011Applicant: TDK CORPORATIONInventors: Takeshi TAKAHASHI, Seigo TOKORO
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Publication number: 20100243945Abstract: A soft magnetic core including a soft magnetic material and a low melting point lubricant is manufactured by adding a low melting point lubricant into an insulation-treated soft magnetic material, warm forming the soft magnetic material with the low melting point lubricant added, and performing a thermal treatment on the warm-molded soft magnetic material. The low melting point lubricant has a melting point ranging from 50° C. to 170° C., and includes at least a material selected from the group consisting of zinc oleate, copper stearate, zinc stearate, calcium stearate, and aluminum stearate.Type: ApplicationFiled: February 17, 2010Publication date: September 30, 2010Applicant: TDK CORPORATIONInventors: Seigo TOKORO, Kouyuu ENDA
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Patent number: 7470334Abstract: A method for manufacturing a sintered compact includes the steps of preparing an alloy powder having a composition represented by Expression 1: RTW (where, R is at least one kind of rare earth metal, T is at least one kind of transition metal, and w defines a relation of 1<w<4), sintering the alloy powder in a vacuum atmosphere or an atmosphere containing gas with a molecular weight of 30 or less, and processing the alloy powder by a hot isostatic pressing. The sintered compact has a high density, and reduces deteriorations in its sintered compact properties such as magnetostrictive properties in an air atmosphere at high-temperatures.Type: GrantFiled: February 7, 2002Date of Patent: December 30, 2008Assignee: TDK CorporationInventors: Teruo Mori, Takeshi Nomura, Seigo Tokoro, Naomichi Umehara
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Patent number: 7138019Abstract: In the step of sintering a compact that is finally to be a magnetostrictive element, when the temperature in a furnace is elevated, the atmosphere in the furnace is evacuated by a vacuum pump to keep the pressure in the furnace at negative pressure in a temperature range that allows thermal decomposition of hydride present in the compact to release hydrogen gas to accelerate release of hydrogen from the compact.Type: GrantFiled: July 26, 2004Date of Patent: November 21, 2006Assignee: TDK CorporationInventors: Seigo Tokoro, Shiro Tomizawa, Teruo Mori