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1.发明申请公开(公告)号：US20210012936A1
公开(公告)日：2021-01-14
申请号：US16969839
申请日：2019-02-14
Inventor： Shin-ichi OHKOSHI , Asuka NAMAI , Marie YOSHIKIYO , Masahiro GOTOH , Toshihiko UEYAMA , Takayuki YOSHIDA
Abstract: There is provided a magnetic material that has an excellent electromagnetic wave absorption performance in a wide frequency range even under low temperature and high temperature environments and that ensures the absorption performance, and provided a magnetic material as a mixture of a magnetic material having positive slope of change in coercive force dependent on temperature, and a magnetic material having negative slope of change in coercive force dependent on temperature.
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2.发明申请公开(公告)号：US20190271694A1
公开(公告)日：2019-09-05
申请号：US16329579
申请日：2017-08-31
Applicant: TOHOKU UNIVERSITY , DOWA ELECTRONICS MATERIALS CO., LTD.
Inventor： Daisuke NAGAO , Mikio KONNO , Haruyuki ISHII , Kumiko HAYASHI , Natsuki KOHAMA , Takayuki YOSHIDA , Toshihiko UEYAMA
IPC: G01N33/543 , G01N33/531
Abstract: To provide magnetic composite particles which can be separated from a sample solution in a short period of time using magnetism, and furthermore, have an excellent dispersion stability in the sample solution, which are magnetic composite particles in which an outer shell is formed on surfaces of core particles containing an inorganic oxide or a polymer, wherein the outer shell comprises magnetic nanoparticles and a silicon compound, the value of the volume average particle diameter (dTEM) of the magnetic composite particles measured by a transmission electron microscope is 30 nm or more to 210 nm or less, and the value of (dDLS)/(dTEM) which is the ratio of the value of the particle diameter (dDLS) of the particles measured by a dynamic light scattering method and the value of the volume average particle diameter (dTEM) is 2.0 or less.
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公开(公告)号：US20180218814A1
公开(公告)日：2018-08-02
申请号：US15578411
申请日：2016-06-01
Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.
Inventor： Takayuki YOSHIDA , Masahiro GOTOH , Toshihiko UEYAMA , Takuyuki BABA , Toru SUZUKI , Koji TANAKA
CPC classification number: H01F1/20 , C08K3/08 , C08K3/40 , C08K7/14 , C08K9/04 , C08K2003/0843 , C08K2003/0856 , C08K2201/006 , C08K2201/01 , C08L81/02 , H01F1/26
Abstract: An object is to provide a magnetic compound excellent in high frequency properties and excellent in mechanical strength, and its related items, using the polyarylene sulfide resin, and to provide a technique regarding the magnetic compound having a metal magnetic powder and a polyarylene sulfide resin, and satisfying both mechanical strength and high frequency properties.
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4.发明申请公开(公告)号：US20180169752A1
公开(公告)日：2018-06-21
申请号：US15129032
申请日：2015-03-27
Applicant: Dowa Electronics Materials Co., Ltd.
Inventor： Masahiro GOTOH , Takayuki YOSHIDA
CPC classification number: B22F1/0018 , B22F1/0088 , B22F9/26 , B22F2201/01 , B22F2301/40 , B22F2304/05 , B22F2304/054 , B22F2998/00 , C22C38/00 , C22C38/10 , C22C2202/02 , H01F1/24 , H01F1/26 , H01F1/33 , H01Q7/08 , H01Q9/0407 , H01Q9/0421 , H01R13/719
Abstract: A method for producing a Fe—Co alloy powder suitable for an antenna includes steps, wherein when introducing an oxidizing agent into an aqueous solution containing Fe ions and Co ions to generate crystal nuclei and cause precipitation and growth of a precursor having Fe and Co as components, Co in an amount corresponding to 40% or more of the total amount of Co used for the precipitation reaction is added to the aqueous solution at a time after the start of the crystal nuclei generation and before the end of the precipitation reaction to obtain the precursor. Then, a dried product of the precursor is reduced to obtain a Fe—Co alloy powder. This Fe—Co alloy powder has a mean particle size of 100 nm or less, a coercive force Hc of 52.0 to 78.0 kA/m, and a saturation magnetization ss of 160 Am2/kg or higher.
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5.发明申请公开(公告)号：US20180151279A1
公开(公告)日：2018-05-31
申请号：US15578471
申请日：2016-06-01
Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.
Inventor： Toshihiko UEYAMA , Masahiro GOTOH , Takayuki YOSHIDA , Takuyuki BABA
CPC classification number: H01F1/26 , B22F1/0059 , B22F1/02 , B22F2001/0066 , B22F2998/10 , B22F2999/00 , C22C2202/02 , B22F3/1017 , B22F3/02 , B22F5/10
Abstract: A magnetic compound having a small dielectric loss and an antenna constituted by the magnetic compound and an electronic device incorporating the antenna are provided by a metal magnetic powder which is well dispersed in a resin having small dielectric loss, and a magnetic powder composite including: a metal magnetic powder; and one or more elements selected from carboxylic acid or its anhydride, aromatic carboxylic acid ester, and a derivative thereof, having a property that real part μ′ permeability is 1.45 or more, tan δμ is 0.1 or less, tan δε is 0.05 or less at a measuring frequency of 2 GHz, when a magnetic powder composite is prepared by adding 5 parts by mass of one or more elements selected from the carboxylic acid or its anhydride, the aromatic carboxylic acid ester, and the derivative thereof to 100 parts by mass of the metal magnetic powder.
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Patent Agency Ranking
公开(公告)号：US20170137302A1
公开(公告)日：2017-05-18
申请号：US15318783
申请日：2015-06-18
Inventor： Shin-ichi OHKOSHI , Marie YOSHIKIYO , Asuka NAMAI , Hiroko TOKORO , Waka TARORA , Tomomichi NASU , Takayuki YOSHIDA , Manabu TANAKA
CPC classification number: C01G49/06 , C01P2002/72 , C01P2002/77 , C01P2002/90 , C01P2006/42 , G11B5/706 , G11B5/714 , G11B5/84 , H01F1/11
Abstract: A magnetic σ-form iron oxide nanopowder is a novel magnetic iron oxide nanopowder having magnetic polarization and spontaneous electric polarization and having physical properties similar to those of half-metals; and a process produces the magnetic nanopowder. The magnetic powder has a composition represented by Fe2O3 and has a crystal structure belonging to the monoclinic system.
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7.发明申请公开(公告)号：US20140356642A1
公开(公告)日：2014-12-04
申请号：US14460513
申请日：2014-08-15
Applicant: THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA , DOWA ELECTRONICS MATERIALS CO., LTD.
Inventor： Dong Chul PYUN , Heemin YOO , Hirohisa OMOTO , Takayuki YOSHIDA
IPC: H01F1/09 , C09D133/20 , G11B5/65 , C09D175/06
Abstract: A metallic magnetic powder where a primary particle of each metallic magnetic particle is a powder without forming an aggregate, and a method of making the same that includes manufacturing a metallic magnetic powder constituted of metallic magnetic particles, containing a metallic magnetic phase, with Fe, or Fe and Co as main components, rare earth elements or yttrium and one or more non-magnetic components removing the non-magnetic component from the metallic magnetic with a reducing agent, while making a complexing agent exist for forming a complex with the non-magnetic component in water; oxidizing the metallic magnetic particle with the non-magnetic component removed; substituting water adhered to the oxidized metallic magnetic particle with an organic solvent; and coating the surface of the metallic magnetic particle with an organic matter different from the organic solvent, while maintaining a wet condition of the metallic magnetic particle with the organic solvent adhered thereto.
Abstract translation: 一种金属磁性粉末，其中每个金属磁性颗粒的一次颗粒是不形成聚集体的粉末，其制造方法包括制造含有金属磁性相的金属磁性颗粒与Fe， 或Fe和Co作为主要成分，稀土元素或钇，以及一种或多种非磁性组分，用还原剂从金属磁性物质除去非磁性成分，同时形成与非磁性组分形成络合物的络合剂， 水中的磁性成分; 在去除了非磁性部件的情况下氧化金属磁性颗粒; 用有机溶剂代替附着在氧化金属磁性颗粒上的水; 并且用与有机溶剂不同的有机物涂覆金属磁性颗粒的表面，同时保持金属磁性颗粒与粘附有机溶剂的湿润状态。
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8.发明申请MAGNETIC FUNCTIONAL FLUID, DAMPER AND CLUTCH USING MAGNETIC FUNCTIONAL FLUID 审中-公开使用磁性功能流体的磁功能流体，阻尼器和离合器公开(公告)号：US20140339029A1
公开(公告)日：2014-11-20
申请号：US14277277
申请日：2014-05-14
Inventor： Yasushi IDO , Koichi HAYASHI , Takayuki YOSHIDA
CPC classification number: F16F9/535 , C10M171/001 , C10N2220/082 , C10N2230/06 , C10N2240/08 , C10N2240/205 , F16D37/02 , F16D2037/002 , F16D2037/005
Abstract: Magnetic functional fluid includes dispersion medium; and dispersed particles which are dispersed in the dispersion medium, wherein the dispersed particles includes: first ferromagnetic particles having an average particle diameter of 0.5 μm to 50 μm; and second ferromagnetic particles each having a needle-like shape, each having a smaller particle size than the first ferromagnetic particles, and each having a length ratio of a long axis to a short axis of 2 or more.
Abstract translation: 磁功能流体包括分散介质; 分散在分散介质中的分散粒子，其中分散粒子包括平均粒径为0.5μm至50μm的第一铁磁颗粒; 和每个具有针状形状的第二铁磁性颗粒，每个具有比第一铁磁性颗粒小的颗粒尺寸，并且每个具有长轴与短轴的长度比为2或更大的长度比。
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公开(公告)号：US20180033530A1
公开(公告)日：2018-02-01
申请号：US15552415
申请日：2016-02-24
Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.
Inventor： Toshihiko UEYAMA , Masahiro GOTOH , Takayuki YOSHIDA , Takuyuki BABA
CPC classification number: H01F1/26 , C08K3/08 , C08K9/04 , C08L25/06 , C08L71/12 , C08L71/126 , C08L25/08
Abstract: An object of the present invention is to provide a magnetic compound excellent in high-frequency property and excellent in mechanical strength and related materials thereof by using at least one of resins selected from syndiotactic polystyrene (SPS) resin and modified polyphenylene ether (m-PPE) resin, including at least one of resins selected from syndiotactic polystyrene (SPS) resin and modified polyphenylene ether (m-PPE) resin, wherein content of the resin is 21 mass % or more.
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10.发明申请MAGNETIC COMPONENT, AND SOFT MAGNETIC METAL POWDER USED THEREIN AND MANUFACTURING METHOD THEREOF 审中-公开磁性元件及其使用的软磁性金属粉末及其制造方法公开(公告)号：US20160001371A1
公开(公告)日：2016-01-07
申请号：US14850109
申请日：2015-09-10
Applicant: DOWA Electronics Materials Co., Ltd.
Inventor： Kazumasa IKARI , Masahiro GOTOH , Takayuki YOSHIDA
CPC classification number: B22F9/26 , B22F1/0018 , B22F1/02 , B22F9/24 , B22F2201/03 , B22F2301/35 , B22F2302/25 , B22F2303/01 , C22C2202/02 , H01F1/20 , H01F1/26 , H01F17/045 , H01F27/255 , H01F27/292 , H01Q1/364 , Y10T428/12014
Abstract: A soft magnetic metal powder is manufactured. An aqueous solution of at least one of aluminum, silicon, a rare-earth element (including Y), and magnesium is added into a solution containing an iron ion while blowing a gas containing oxygen thereinto, to form a precursor containing at least one of aluminum, silicon, a rare-earth element (including Y), and magnesium. The precursor is reduced to obtain a metal powder. The metal powder is further slowly oxidized with oxygen to form an oxidized film on the surface of the metal powder.
Abstract translation: 制造软磁性金属粉末。 将含有铝，硅，稀土元素（包括Y）和镁中的至少一种的水溶液加入含铁离子的溶液中，同时吹入含氧气体，形成含有至少一种 铝，硅，稀土元素（包括Y）和镁。 将前体还原以获得金属粉末。 金属粉末被氧气进一步缓慢氧化，以在金属粉末的表面上形成氧化膜。
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