Calcium, Barium, Strontium, Or Lead Patents (Class 252/62.63)
  • Patent number: 10734144
    Abstract: A production method for metal oxide particles includes: obtaining precursor particles of a metal oxide by performing a synthesis reaction of the precursor particles in the presence of an organic compound; and converting the obtained precursor particles into metal oxide particles by heating an aqueous solution containing the precursor particles to 300° C. or higher and pressurizing the aqueous solution at a pressure of 20 MPa or higher.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: August 4, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Masashi Shirata, Yoichi Hosoya
  • Patent number: 10679660
    Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9?l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: June 9, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Tetsuya Kaneko, Norihito Kasada, Eiki Ozawa
  • Patent number: 10614939
    Abstract: Disclosed herein are compositions and methods of making a hard magnetic material from iron oxide fines, the hard magnetic material having a general formula MFexOy. In one aspect, the method comprises a) providing an iron oxide fine; b) providing a metal carbonate of a general formula Mx(CO3)y; c) mixing the iron oxide fine and the metal carbonate to form a mixture; d) calcining the mixture of the iron oxide fine and the metal carbonate; wherein M is a divalent metal ion.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: April 7, 2020
    Assignee: SAUDI BASIC INDUSTRIES CORPORATION
    Inventors: Mohamed Bahgat Saddik, Fazal-Ur-Rehman Awan
  • Patent number: 10208376
    Abstract: The present invention provides an apparatus and a method for coating small Nd—Fe—B magnets. The apparatus includes a furnace having a roller including at least one stirring piece disposed in the compartment. The stirring pieces have an isosceles triangle or trapezoidal shaped cross-section. The side wall of the furnace defines an inlet aperture and an outlet aperture disposed diametrically opposed to one another. A plurality of target source holders include two first target source holders and two second target source holders disposed on the side wall and spaced from one another and between the inlet aperture and the outlet aperture. The method includes a step of disposing a plurality of conductors with the small Nd—Fe—B magnets in the compartment of the roller. The small Nd—Fe—B magnets are mixed with the plurality of conductors in the roller with the roller being rotated of between 5 rpm and 20 rpm.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: February 19, 2019
    Assignee: YANTAI SHOUGANG MAGNETIC MATERIALS INC.
    Inventors: Zhongjie Peng, Kunkun Yang, Daoning Jia
  • Patent number: 10103112
    Abstract: A circuit board with a measure against high frequency noise includes: an interconnect substrate having an interconnect pattern to which an IC which is a source of high frequency noise is electrically connected; a pair of lands provided on a mounting surface of the interconnect substrate; and a chip component having a body composed of a magnetic body (i.e., ferrite) in a rectangular parallelepiped, and a pair of external electrodes provided at opposite ends of the body, the pair of external electrodes being connected to the pair of lands, the body being disposed on the interconnect pattern, as observed in a direction perpendicular to the mounting surface.
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: October 16, 2018
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yu Ishiwata
  • Patent number: 9666341
    Abstract: A method for production of an anisotropic bonded magnet includes: aligning magnetic pole bodies which include an even number of permanent magnets arranged uniformly around an outer periphery of an annular cavity filled with magnetic raw material, aligning magnetic fields to cause rare-earth anisotropic magnet powder to be semi-radially aligned; compressively molding the semi-radially aligned magnet raw material to obtain an annular compact; discharging the compact from the annular cavity; demagnetizing causing the aligning magnetic pole bodies to relatively move only in circumferential direction with respect to the compact after the molding step thereby to apply demagnetization magnetic fields to the compact; The demagnetization magnetic fields are applied from the aligning magnetic pole bodies with opposite poles to those during the alignment step, and the demagnetization magnetic fields are in directions for cancelling the magnetization of the compact caused by the aligning magnetic fields.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: May 30, 2017
    Assignee: AICHI STEEL CORPORATION
    Inventors: Yoshinobu Honkura, Hironari Mitarai, Hiroshi Matsuoka, Masayuki Kato, Ikuzou Okumura
  • Patent number: 9607741
    Abstract: The present invention relates to ferrite particles for bonded magnet, having a volume-average particle diameter of 2.1 to 2.7 ?m and a particle diameter ×90 of 4.3 to 5.4 ?m wherein the ×90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus.
    Type: Grant
    Filed: April 18, 2014
    Date of Patent: March 28, 2017
    Assignee: TODA KOGYO CORPORATION
    Inventors: Yasuhiko Fujii, Minoru Ohsugi, Yasushi Nishio, Yosuke Koyama, Shigeru Takaragi
  • Patent number: 9454983
    Abstract: An aspect of the present invention relates to a method of manufacturing hexagonal ferrite powder, which comprises preparing a hexagonal ferrite precursor-containing water-based solution by stirring and mixing a reaction solution which comprises an iron salt, an alkaline earth metal salt, and a base in a reaction tank, and removing the hexagonal ferrite precursor-containing water-based solution that has been prepared from the reaction tank and continuously feeding the hexagonal ferrite precursor-containing water-based solution into a reaction flow passage while conducting heating and pressurizing to converting the hexagonal ferrite precursor to hexagonal ferrite, wherein the preparation of the hexagonal ferrite precursor-containing water-based solution comprises a continual feed period during which feeding of the iron salt, the alkaline earth metal salt, and the base into a reaction tank which comprises a prereaction solution in which an iron salt and a base are not both present is continuously or intermittent
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: September 27, 2016
    Assignee: FUJIFILM Corporation
    Inventor: Yoichi Hosoya
  • Patent number: 9424968
    Abstract: A magnetic material for antennas including: an M-type hexagonal ferrite represented by the following general formula (1) as a main phase, MA.Fe12-x.MBx.O19 (wherein MA is at least one kind selected from the group consisting of Sr and Ba, MB is MC or MD, MC is at least one kind selected from the group consisting of Al, Cr, Sc and In, MD is an equivalent mixture of at least one kind selected from the group consisting of Ti, Sn and Zr and at least one kind selected from the group consisting of Ni, Zn, Mn, Mg, Cu and Co, X is a number from 1 to 5), and an average crystal particle diameter is equal to or greater than 5 ?m.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: August 23, 2016
    Assignee: TDK CORPORATION
    Inventors: Tomokazu Ishikura, Michihiro Muramoto, Akihiro Harada, Katsumi Kawasaki, Tomofumi Kuroda
  • Patent number: 9382130
    Abstract: The method of manufacturing hexagonal ferrite magnetic particles, which includes providing hexagonal ferrite magnetic particles by conducting calcination of particles comprising an alkaline earth metal salt and an iron salt to cause ferritization; and further includes causing a glass component to adhere to the particles and then conducting the calcination of the particles to form a calcined product in which hexagonal ferrite is detected as a principal component in X-ray diffraction analysis; and removing the glass component from a surface of the calcined product that has been formed.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: July 5, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Yasushi Hattori, Kazufumi Omura
  • Patent number: 9272955
    Abstract: An object of the present invention is to provide a ferrite magnetic material capable of providing a permanent magnet in which high Br and HcJ are kept, and which has a high Hk/HcJ. A ferrite magnetic material in accordance with a preferred embodiment has a ferrite phase having a hexagonal structure and has a main composition represented by Ca1-w-x-yRwSrxBayFezMmO19 (R is at least one element of rare earth elements (including Y) essentially including La, and Bi, and M is at least one element of Co, Mn, Mg, Ni, Cu, and Zn essentially including Co), where 0.25<w<0.65, 0.01<x<0.45, 0.0002<y<0.011, y<x, 8<z<11, 1.0<w/m<2.5, and 0.017<m/z<0.065 are satisfied. The total amount of a Si component is 0.1 to 3 mass % based on the amount of the main composition, and respective elements satisfy the relationship of 1.5?[(Ca+R+Sr+Ba)?(Fe+M)/12]/Si?3.5.
    Type: Grant
    Filed: July 5, 2010
    Date of Patent: March 1, 2016
    Assignee: TDK CORPORATION
    Inventors: Junichi Nagaoka, Takahiro Mori, Hiroyuki Morita, Yoshihiko Minachi
  • Patent number: 9202613
    Abstract: A ferrite magnet and a ferrite sintered magnet including a ferrite magnetic material are provided. A main phase of the ferrite magnetic material includes a ferrite phase having a hexagonal crystal structure, and metal element composition expressed by Ca1-w-x-yR wSr xBayFezMm wherein 0.25<w<0.5, 0.01<x<0.35, 0.0001<y<0.013, y<x, 8.7<z<9.9, 1.0<w/m<2.1, 0.017<m/z<0.055 and Si component is at least included as a sub-component, and wherein; when content y1 mass % of the Si component in the ferrite magnetic material, with respect to SiO2, is shown on Y-axis and a total content x1 of z and m is shown on X-axis, a relation between x1 and y1 is within a range surrounded by 4 points placed on X-Y coordinate having the X and Y axes.
    Type: Grant
    Filed: November 4, 2013
    Date of Patent: December 1, 2015
    Assignee: TDK CORPORATION
    Inventors: Shigeki Yanagida, Takahiro Mori, Hiroyuki Morita, Nobuhiro Suto, Tatsuya Katoh, Yoshihiko Minachi
  • Patent number: 9123460
    Abstract: Disclosed herein are a ferrite composition for a high frequency bead in that a part of Fe in M-type hexagonal ferrite represented by BaFe12O19 is substituted with at least one metal selected from a group consisting of 2-valence, 3-valence and 4-valence metals, as well as a chip bead material using the same. According to embodiments of the present invention, the dielectric composition is characterized in that a part of Fe as a constituent of M-type hexagonal barium ferrite is substituted by other metals, to thus decrease a sintering temperature to 920° C. or less without using any additive for low temperature sintering. Moreover, because of high SRF properties, the inventive composition is applicable to a multilayer type chip bead used at a high frequency of more than several hundreds MHz and a magnetic antenna.
    Type: Grant
    Filed: October 3, 2011
    Date of Patent: September 1, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sung Yong An, Jin Woo Hahn, Jeong Wook Kim, Sung Lyoung Kim, So Yeon Song, Soo Hwan Son, Ic Seob Kim
  • Patent number: 9093218
    Abstract: A method for producing a permanent magnet for a motor, including a step of producing a slurry of a magnet powder, a step of molding the slurry into a sheet form to prepare green sheets of the magnet powder, and a step of alternately laminating the green sheets of the magnet powder and an insulating layer and sintering the laminated plural layers.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: July 28, 2015
    Assignees: NITTO DENKO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Izumi Ozeki, Katsuya Kume, Junichi Nakayama, Yuuki Fukuda, Toshinobu Hoshino, Tomokazu Horio, Kenji Nakamura
  • Patent number: 9034210
    Abstract: A feedstock for injection molding includes a ceramic filler that is sinterable to produce a ceramic with a positive temperature coefficient of electrical resistance, a matrix for binding the ceramic filler, the matrix having a melting point lower than a melting point of the ceramic filler, and metallic impurities. A content of the metallic impurities in the feedstock is lower than 10 ppm.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: May 19, 2015
    Assignee: EPCOS AG
    Inventors: Jan Ihle, Verena Fischer, Karin Hajek, Gerd Scheiwe, Thomas Haferkorn, Moritz V. Witzleben
  • Publication number: 20150123026
    Abstract: Provided is magnetic powder capable of enhancing simultaneously both magnetic characteristics including SNP and durability of a magnetic recording medium. The hexagonal ferrite magnetic powder for a magnetic recording medium has a Ba/Fe molar ratio of 8.0% or more, a Bi/Fe molar ratio of 2.5% or more and an Al/Fe molar ratio of from 3.0 to 6.0%. The magnetic powder preferably has an activation volume Vact of from 1,400 to 1,800 nm3. The magnetic powder particularly preferably has a coercive force Hc of from 159 to 279 kA/m (which is approximately from 2,000 to 3,500 Oe) and a coercivity distribution SFD of from 0.3 to 1.0. The magnetic powder may contain, as an element that substitutes an Fe site of the hexagonal ferrite, at least one kind selected from divalent transition metals M1 and tetravalent transition metals M2.
    Type: Application
    Filed: October 31, 2014
    Publication date: May 7, 2015
    Inventors: Kenji MASADA, Hirohisa OMOTO, Futoshi NAGASHIMA, Daisuke ABE, Toshio TADA, Norihito KASADA
  • Patent number: 8980116
    Abstract: A sintered ferrite magnet having a ferrite phase with a hexagonal structure as the main phase, wherein the composition of the metal elements composing the main phase is represented by the following general formula (1): RxCamA1?x?m(Fe12?yMy)z: ??(1), x, m, y and z in formula (1) satisfying all of the conditions represented by the following formulas (2)-(6): 0.2?x?0.5: ??(2) 0.13?m?0.41: ??(3) 0.7x?m?0.15: ??(4) 0.18?yz?0.31: ??(5) 9.6?12z?11.8: ??(6), and wherein the density of the sintered ferrite magnet is at least 5.05 g/cm3, and the crystal grains of the sintered ferrite magnet satisfy all of the conditions represented by the following formulas (7) and (8), where L ?m is the average for the maximum value and S ?m is the average for the minimum value among the diameters passing through the center of gravity of each grains in the crystal cross-section parallel to the c-axis direction of hexagonal structures. L?0.95: ??(7) 1.8?L/S?2.5: ??(8).
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: March 17, 2015
    Assignee: TDK Corporation
    Inventors: Shigeki Yanagida, Noboru Ito, Yuuki Aburakawa, Naoki Mori, Yoshihiko Minachi
  • Patent number: 8920670
    Abstract: A magnetic material of an embodiment includes: first magnetic particles that contain at least one magnetic metal selected from the group including Fe, Co, and Ni, are 1 ?m or greater in particle size, and are 5 to 50 ?m in average particle size; second magnetic particles that contain at least one magnetic metal selected from the group including Fe, Co, and Ni, are smaller than 1 ?m in particle size, and are 5 to 50 nm in average particle size; and an intermediate phase that exists between the first magnetic particles and the second magnetic particles.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: December 30, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koichi Harada, Tomohiro Suetsuna, Toshihide Takahashi, Seiichi Suenaga
  • Publication number: 20140308490
    Abstract: A magnetizable ink contains at least 65% of magnetizable particles having a modal diameter between 3 ?m and 10 ?m. The particles may have a size distribution with 0% above 18 micron and not greater than 20% under 0.5 micron. The particles may have a surface area less than 50,000 cm2 per cm3, and/or the ink may have a viscosity less than 16,000 cps when ready to print. Where the particles are rounded, magnetically soft iron particles, the surface area may be less than 12,000 cm2 per cm3 and the viscosity may be less than 1,500 cps.
    Type: Application
    Filed: April 10, 2013
    Publication date: October 16, 2014
    Inventor: Roger Burrows
  • Patent number: 8840802
    Abstract: An aspect of the present invention relates to a method of manufacturing hexagonal ferrite magnetic powder. The method of manufacturing hexagonal ferrite magnetic powder comprises wet processing hexagonal ferrite magnetic particles obtained following acid treatment in a water-based solvent to prepare an aqueous magnetic liquid satisfying relation (1) relative to an isoelectric point of the hexagonal ferrite magnetic particles: pH0?pH*?2.5, wherein, pH0 denotes the isoelectric point of the hexagonal ferrite magnetic particles and pH* denotes a pH of the aqueous magnetic liquid, which is a value of equal to or greater than 2.0, adding a surface-modifying agent comprising an alkyl group and a functional group that becomes an anionic group in the aqueous magnetic liquid to the aqueous magnetic liquid to subject the hexagonal ferrite magnetic particles to a surface-modifying treatment, and removing the water-based solvent following the surface-modifying treatment to obtain hexagonal ferrite magnetic particles.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: September 23, 2014
    Assignee: FUJIFILM Corporation
    Inventors: Masahiko Mori, Hiroyuki Suzuki
  • Patent number: 8835001
    Abstract: A ferrite sintered magnet has a surface roughness Rz of 3.5 ?m or less. A method for producing a ferrite sintered magnet includes: mixing magnetic powders with at least a binder resin to obtain a magnetic powder mixture; injection molding the magnetic powder mixture inside of a mold having a surface roughness of a surface in contact with the magnetic powder mixture of 2.0 ?m or less with a magnetic field applied to the mold, to obtain a molded body; and sintering the molded body.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: September 16, 2014
    Assignee: TDK Corporation
    Inventors: Hideyuki Umezawa, Yoshihiko Minachi, Osanori Mizonoue
  • Patent number: 8834738
    Abstract: An object of the present invention is to provide a ferrite magnetic material which can provide a permanent magnet retaining high Br and HcJ as well as having high Hk/HcJ. The ferrite magnetic material according to a preferred embodiment is a ferrite magnetic material formed of hard ferrite, wherein a P content in terms of P2O5 is 0.001% by mass or more.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: September 16, 2014
    Assignee: TDK Corporation
    Inventors: Junichi Nagaoka, Takahiro Mori, Hiroyuki Morita, Yoshihiko Minachi
  • Patent number: 8828265
    Abstract: The invention relates to a modified strontium ferrite of the general chemical formula: Sr1-xLaxFe12-yCoyO19; in which x=y=0.01-1.00 or x=0.15 and y=x/1.6n to =x/2.6n, where n is the Fe2O3:SrO ratio used and may be 5-6. According to the invention, lanthanum and cobalt are added in an amount such that 0.14?x?0.145 and 0.14?y?0.145. The modified strontium ferrite thus prepared has excellent magnetic properties with regard to the remanence BR, the coercive force HCJ and the ratio of HK to HCJ.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: September 9, 2014
    Assignee: TRIDELTA Hartferrite GmbH
    Inventor: Kevin Mikenda
  • Patent number: 8801956
    Abstract: A hexagonal crystal ferrite magnetic powder having high magnetic characteristics while having a small particle volume and a high specific surface area is provided, and a high-density magnetic recording medium using the powder. A method for producing a hexagonal crystal ferrite formed using a glass crystallization method includes the steps of: mixing a glass matrix with raw materials including iron, bismuth, a divalent metal (M1), a tetravalent metal (M2), any one kind (A) of barium, strontium, calcium, and lead, and at least one kind of rare earth element (represented by R) having a mole equal to or less than that of the iron; heating the mixed raw material to obtain a glass body; quenching the glass body, pulverizing the glass body, and performing a heat treatment, and washing the glass body after the heat treatment with an acid solution.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: August 12, 2014
    Assignee: Dowa Electronics Materials Co., Ltd.
    Inventors: Kenji Masada, Tomoyuki Ishiyama, Gousuke Iwasaki
  • Patent number: 8753530
    Abstract: An aspect of the present invention relates to a method of preparing a magnetic particle, which comprises attaching a transition metal-containing organic compound to a surface of a hard magnetic particle and then thermally decomposing the transition metal-containing organic compound to obtain the magnetic particle.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: June 17, 2014
    Assignees: FUJIFILM Corporation, Tohoku University
    Inventors: Yasushi Hattori, An-Pang Tsai, Satoshi Kameoka
  • Publication number: 20140151595
    Abstract: The method of manufacturing hexagonal ferrite magnetic particles includes providing hexagonal ferrite magnetic particles by conducting calcination of particles comprising an iron salt and an alkaline earth metal salt to cause ferritization; and further includes preparing the particles comprising an iron salt and an alkaline earth metal salt by adhering a glass component, followed by the alkaline earth metal salt, to the iron salt; and conducting calcination of the particles prepared to form a calcined product in which hexagonal ferrite is detected as a principal component in X-ray diffraction analysis.
    Type: Application
    Filed: December 2, 2013
    Publication date: June 5, 2014
    Applicant: FUJIFILM Corporation
    Inventors: Yasushi HATTORI, Kazufumi OMURA
  • Patent number: 8741170
    Abstract: The present invention relates to ferrite particles for bonded magnet, having a volume-average particle diameter of 2.1 to 2.7 ?m and a particle diameter x90 of 4.3 to 5.4 ?m wherein the x90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: June 3, 2014
    Assignee: Toda Kogyo Corporation
    Inventors: Yasuhiko Fujii, Minoru Ohsugi, Yasushi Nishio, Yosuke Koyama, Shigeru Takaragi
  • Publication number: 20140138571
    Abstract: The present invention provides a magnetoelectric material in which an electric property is capable of being controlled by a magnetic field or a magnetic property is capable of being controlled by an electric field, and a method of manufacturing the same. Particularly, the present invention provides a magnetoelectric material in which a distance between magnetic ions interacting with each other is controlled by using non-magnetic ions or alkaline earth metal ions, and a method of manufacturing the same.
    Type: Application
    Filed: November 18, 2013
    Publication date: May 22, 2014
    Applicant: SNU R&DB FOUNDATION
    Inventors: Kee Hoon KIM, Sae Hwan CHUN, Yi Sheng CHAI, Kwang Woo SHIN
  • Patent number: 8696925
    Abstract: Embodiments disclosed herein include methods of modifying synthetic garnets used in RF applications to reduce or eliminate Yttrium or other rare earth metals in the garnets without adversely affecting the magnetic properties of the material. Some embodiments include substituting Bismuth for some of the Yttrium on the dodecahedral sites and introducing one or more high valency ions to the octahedral and tetrahedral sites. Calcium may also be added to the dodecahedral sites for valency compensation induced by the high valency ions, which could effectively displace all or most of the Yttrium (Y) in microwave device garnets. The modified synthetic garnets with substituted Yttrium (Y) can be used in various microwave magnetic devices such as circulators, isolators and resonators.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: April 15, 2014
    Assignee: Skyworks Solutions, Inc.
    Inventors: David Bowie Cruickshank, Michael D. Hill
  • Patent number: 8668839
    Abstract: Disclosed is a MnZnCo-based ferrite consisting of base constituents, accessory constituents, and inevitable impurities, which MnZnCo-based ferrite is characterized by adding silicon oxide (SiO2 conversion): 50-400 mass ppm and calcium oxide (CaO conversion): 1000-4000 mass ppm as secondary constituents to base constituents consisting of iron oxide (Fe2O3 conversion): 51.0-53.0 mol %, zinc oxide (ZnO conversion): greater than 12.0 mol % and less than 18.0 mol %, cobalt oxide (CoO conversion): 0.04-0.60 mol %, and manganese oxide (MnO conversion): remainder, and keeping phosphorus, boron, sulfur, and chlorine of the inevitable impurities to phosphorous: less than 3 mass ppm, boron: less than 3 mass ppm, sulfur: less than 5 mass ppm, and chlorine: less than 10 mass ppm. This MnZnCo-based ferrite has the superior characteristics of always having incremental permeability [mu]? of 2000 or greater across a wide temperature range of ?40 DEG C. to 85 DEG C.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: March 11, 2014
    Assignee: JFE Chemical Corporation
    Inventors: Hirofumi Yoshida, Yukiko Nakamura, Satoshi Goto
  • Publication number: 20140000787
    Abstract: The hot-melt adhesive composition contains a hot-melt adhesive, a ferromagnetic substance, and a foaming agent that foams when heated, and the hot-melt adhesive composition has: a surface magnetic force of 20 mT or more; a surface magnetic force after heating for adhesion of 5 mT or less; and a volume change ratio due to heating for adhesion of 110% to 400%. The hot-melt adhesive composition may be formed into a sheet-like shape to provide a hot-melt adhesive sheet, which exhibits an excellent adhesive force by heating and which also exhibits a sufficient temporarily fixing force due to magnetic force at the initial stage, but the magnetic force is sufficiently reduced after heating, so that the occurrence of irregularity on the surface due to magnetic force lines after heating can be suppressed.
    Type: Application
    Filed: February 8, 2012
    Publication date: January 2, 2014
    Applicant: LINTEC CORPORATION
    Inventors: Yoshitomo Ono, Yumiko Amino
  • Patent number: 8591760
    Abstract: A ferrite magnet and a ferrite sintered magnet including a ferrite magnetic material are provided. A main phase of the ferrite magnetic material includes a ferrite phase having a hexagonal crystal structure, and metal element composition expressed by Ca1-w-x-yR wSr xBayFezMm wherein 0.25<w<0.5, 0.01<x<0.35, 0.0001<y<0.013, y<x, 8.7<z<9.9, 1.0<w/m<2.1, 0.017<m/z<0.055 and Si component is at least included as a sub-component, and wherein; when content y1 mass % of the Si component in the ferrite magnetic material, with respect to SiO2, is shown on Y-axis and a total content x1 of z and m is shown on X-axis, a relation between x1 and y1 is within a range surrounded by 4 points placed on X-Y coordinate having the X and Y axes.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: November 26, 2013
    Assignee: TDK Corporation
    Inventors: Shigeki Yanagida, Takahiro Mori, Hiroyuki Morita, Nobuhiro Suto, Tatsuya Katoh, Yoshihiko Minachi
  • Patent number: 8564493
    Abstract: A method of making Y-type hexagonal ferrite and an antenna using the same are provided. Y-type hexagonal ferrite includes a base ferrite composed of iron oxide, barium carbonate and cobalt oxide, and silicate glass ranging from 0.5 to 5 weight percent added to 100 weight percent of base ferrite. An antenna apparatus includes a magnetic carrier and an antenna pattern formed thereon. The magnetic carrier is formed of such Y-type hexagonal ferrite, and the antenna pattern resonates in a specific frequency band when electric power is supplied. To fabricate the Y-type hexagonal ferrite, a calcination process is performed in which iron oxide, barium carbonate and cobalt oxide are combined into base ferrite at a given calcination temperature after being mixed. A sintering process is performed to sinter the base ferrite and the silicate glass at a given sintering temperature which is lower than the calcination temperature after adding the silicate glass to the base ferrite.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: October 22, 2013
    Assignees: Samsung Electronics Co, Ltd., SUNGKYUNKWAN UNIVERSITY Foundation for Corporate Collaboration
    Inventors: Joong Hee Lee, Young Ho Han, Il Jeong Park
  • Patent number: 8562851
    Abstract: A ferrite material and an electronic component which employs sintered ferrite formed from the ferrite material. The ferrite material is obtained by adding, as minor ingredients, 0.06-0.50 parts by weight of bismuth oxide in terms of Bi2O3, 0.11-0.90 parts by weight of titanium oxide in terms of TiO2, and 0.06-0.46 parts by weight of barium oxide in terms of BaO to a ferrite powder comprising iron oxide, copper oxide, zinc oxide, and nickel oxide as major ingredients. The weight ratio among the bismuth oxide, the titanium oxide, and the barium oxide is as follows: when the proportion of the bismuth oxide in terms of Bi2O3 is taken as 1.00, then the proportion of the titanium oxide in terms of TiO2 is 1.08-2.72 and that of the barium oxide in terms of BaO is 0.72-1.20.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: October 22, 2013
    Assignees: Soshin Electric Co., Ltd., NGK Insulators, Ltd.
    Inventors: Yui Kumura, Yukio Isowaki, Tadashi Otagiri
  • Patent number: 8545714
    Abstract: An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic particle comprising melting an Al-containing starting material mixture to prepare a melt and quenching the melt to obtain an amorphous material; subjecting the amorphous material to heat treatment to cause a hexagonal ferrite magnetic particle to precipitate in a product obtained by the heat treatment; collecting a hexagonal ferrite magnetic particle by subjecting the product to treatment with an acid and washing, wherein the hexagonal ferrite magnetic particle collected has a particle size ranging from 15 to 30 nm, comprises 0.6 to 8.0 weight percent of Al, based on Al2O3 conversion, relative to a total weight of the particle, and Al adheres to a surface of the hexagonal ferrite magnetic particle.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: October 1, 2013
    Assignee: FUJIFILM Corporation
    Inventors: Hiroyuki Suzuki, Nobuo Yamazaki
  • Patent number: 8545713
    Abstract: The present invention relates to black magnetic iron oxide particles comprising magnetite as a main component, wherein when the black magnetic iron oxide particles are molded into a tablet shape, an electric resistance value of the tablet in an alternating current electric field is controlled to produce an impedance of not less than 2×106 ?cm as measured in a characteristic frequency range thereof. The black magnetic iron oxide particles according to the present invention can provide a toner capable of exhibiting a good charging performance and a uniform charging property under the high-temperature and high-humidity conditions, so that when developing an electrostatic latent image therewith, it is possible to obtain toner images having a high resolution or definition, and further the use of heavy metal elements in the black magnetic iron oxide particles can be minimized.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: October 1, 2013
    Assignee: Toda Kogyo Corporation
    Inventors: Ryo Iwai, Mamoru Kamigaki, Nobuya Shimo, Naoki Uchida
  • Patent number: 8524108
    Abstract: An aspect of the present invention relates to a magnetic particle obtained by heat-treating a hexagonal ferrite magnetic material in reducing atmosphere containing hydrocarbon gas.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: September 3, 2013
    Assignee: FUJIFILM Corporation
    Inventor: Yasushi Hattori
  • Patent number: 8518289
    Abstract: A Mn—Zn—Co ferrite core includes a basic component, sub-components, and unavoidable impurities. As the sub-components, silicon oxide (in terms of SiO2): 50-400 mass ppm and calcium oxide (in terms of CaO): 1000-4000 mass ppm are added to the basic component consisting of iron oxide (in terms of Fe2O3): 51.0-53.0 mol %, zinc oxide (in terms of ZnO): more than 12.0 mol % and 18.0 mol % or less, cobalt oxide (in terms of CoO): 0.04-0.60 mol %, and manganese oxide (in terms of MnO): balance; Phosphorus, boron, sulfur, and chlorine in the unavoidable impurities are reduced as follows, phosphorus: less than 3 mass ppm, boron: less than 3 mass ppm, sulfur: less than 5 mass ppm, and chlorine: less than 10 mass ppm; and a ratio of a measured specific surface of the Mn—Zn—Co ferrite core to an ideal specific surface of the Mn—Zn—Co ferrite core satisfies: Measured specific surface/ideal specific surface <1500.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: August 27, 2013
    Assignee: JFE Chemical Corporation
    Inventors: Hirofumi Yoshida, Yukiko Nakamura, Satoshi Goto
  • Patent number: 8512590
    Abstract: A method for producing a sintered ferrite magnet having an M-type ferrite structure and represented by: Ca1?x?yRxBayFe2n-zCoz, (by atomic ratio), where 0.3?1?x?y?0.65, 0.2?x?0.65, 0.001?y?0.2, 0.03?z?0.65, 4?n?7, and 1?x?y>y. The method includes mixing a Ca compound, an R element compound, a Ba compound, an iron compound and a Co compound as starting materials; calcining the starting materials to obtain calcined bodies; pulverizing the calcined bodies to obtain a calcined powder; providing recycled materials having an M-type ferrite structure and being represented by the above formula; pulverizing the recycled materials to obtain a recycled material powder; mixing the recycled material powder with the calcined powder to form a moldable material; molding the moldable material to obtain green bodies; and sintering the green bodies to obtain the sintered ferrite magnet.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: August 20, 2013
    Assignee: Hitachi Metals, Ltd.
    Inventors: Takashi Takami, Hiroshi Iwasaki, Yoshinori Kobayashi, Naoki Mochi, Ryuji Gotoh
  • Patent number: 8506838
    Abstract: A sintered ferrite magnet comprising a first granular ferrite compound phase containing Ca, La, Fe and Co and having a Curie temperature Tc1 between 415° C. and 430° C., and a second granular ferrite compound phase containing Sr, La, Fe and Co and having a Curie temperature Tc2 between 437° C. and 455° C., the volume ratio of the first ferrite compound phase being 50-90%, and the volume ratio of the second ferrite compound phase being 10-50%, with their total volume ratio being 95% or more.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: August 13, 2013
    Assignee: Hitachi Metals, Ltd.
    Inventors: Seiichi Hosokawa, Etsushi Oda, Hiroshi Iwasaki
  • Publication number: 20130169488
    Abstract: A new magnetic substance having a high magnetic permeability and a low magnetic permeability loss over a wide frequency bandwidth, a composite material for antennas using the new magnetic substance and a polymer, and an antenna using the composite material for antennas.
    Type: Application
    Filed: September 6, 2012
    Publication date: July 4, 2013
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jun-sig KUM, Nak-hyun KIM, Hyun-jin KIM, Seung-kee YANG, Joong-hee LEE
  • Publication number: 20130164563
    Abstract: An aspect of the present invention relates to a method of manufacturing magnetic particles, which comprises adding a carboxylic acid compound to a water-based magnetic liquid, wherein the water-based magnetic liquid comprises magnetic particles dispersed in an acidic water-based solvent, and the carboxylic acid compound is selected from the group consisting of aromatic compounds and aliphatic compounds having one or more carboxylic acid (salt) groups denoted by: —COOM wherein M denotes a hydrogen atom or an alkali metal atom, when the number of the carboxylic acid (salt) group contained within the molecule thereof is 1, the number of carbon atoms, excluding the carboxylic acid (salt) group portion, ranges from 1 to 13; and then collecting the magnetic particles from the water-based magnetic liquid to obtain the magnetic particles the surfaces of which have been modified by being coated with the carboxylic acid compound.
    Type: Application
    Filed: December 26, 2012
    Publication date: June 27, 2013
    Applicant: FUJIFILM CORPORATION
    Inventor: FUJIFILM Corporation
  • Patent number: 8444872
    Abstract: Disclosed is a magnetic material having high Hc and High Curie point, which is capable of controlling such magnetic characteristics without requiring rare or expensive raw materials. Specifically disclosed is a magnetic material composed of particles of a magnetic iron oxide which is represented by the following general formula: ?-AxByFe2?x?yO3 or ?-AxByCzFe2?x?y?zO3 (wherein A, B and C each represents a metal excluding Fe and different from each other, satisfying 0<x, y, z<1), with ?-Fe2O3 as a main phase.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: May 21, 2013
    Assignees: The University of Tokyo, Dowa Electronics Materials Co., Ltd.
    Inventors: Shin-ichi Ohkoshi, Shunsuke Sakurai, Takenori Yorinaga, Kazuyuki Matsumoto, Shinya Sasaki
  • Patent number: 8419966
    Abstract: An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic powder comprising preparing a melt by melting a starting material mixture comprising a hexagonal ferrite-forming component and a glass-forming component; rapidly cooling the melt to obtain an amorphous material comprising 0.3 to 2.0 weight percent of carbon atoms; heating the amorphous material to a temperature range of 580 to 700° C. and maintaining the amorphous material within the temperature range to precipitate hexagonal ferrite magnetic particles; and collecting the hexagonal ferrite magnetic particles precipitated.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: April 16, 2013
    Assignee: FUJIFILM Corporation
    Inventors: Shiho Kamisawa, Toshio Tada, Nobuo Yamazaki
  • Patent number: 8398880
    Abstract: An aspect of the present invention relates to a method of modifying a surface of a powder, comprising mixing a powder with a compound denoted by general formula (I): wherein, in general formula (I), each of R10 and R13 independently denotes a hydrogen atom, alkyl group, or aryl group, each of R11 and R12 independently denotes an alkyl group or an aryl group, and L denotes a single bond or an oxygen atom.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: March 19, 2013
    Assignee: FUJIFILM Corporation
    Inventor: Kazufumi Omura
  • Publication number: 20130050041
    Abstract: Disclosed are synthetic garnets and related devices that can be used in radio-frequency (RF) applications. In some embodiments, such RF devices can include garnets having reduced or substantially nil Yttrium or other rare earth metals. Such garnets can be configured to yield high dielectric constants, and ferrite devices, such as TM-mode circulators/isolators, formed from such garnets can benefit from reduced dimensions. Further, reduced or nil rare earth content of such garnets can allow cost-effective fabrication of ferrite-based RF devices. In some embodiments, such ferrite devices can include other desirable properties such as low magnetic resonance linewidths. Examples of fabrication methods and RF-related properties are also disclosed.
    Type: Application
    Filed: May 30, 2012
    Publication date: February 28, 2013
    Applicant: SKYWORKS SOLUTIONS, INC.
    Inventors: David Bowie CRUICKSHANK, Rickard Paul O'DONOVAN, Iain Alexander MACFARLANE, Brian MURRAY, Michael David HILL
  • Patent number: 8303837
    Abstract: A rotating machine comprising a sintered ferrite magnet having an M-type ferrite structure, comprising Ca, an R element that is at least one of rare earth elements and indispensably includes La, Ba, Fe and Co as indispensable elements, and having a composition represented by the formula: Ca1-x-yRxBayFe2n-zCoz, wherein (1?x?y), x, y, z and n represent the contents of Ca, the R element, Ba and Co, and a molar ratio, meeting 0.3?1?x?y?0.65, 0.2?x?0.65, 0.001?y?0.2, 0.03?z?0.65, 4?n?7, and 1?x?y>y; a bonded magnet comprising ferrite powder having the above composition and a binder, and a magnet roll, at least one magnetic pole portion of which is made of the above bonded magnet.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: November 6, 2012
    Assignee: Hitachi Metals, Ltd.
    Inventors: Takashi Takami, Hiroshi Iwasaki, Yoshinori Kobayashi, Naoki Mochi, Ryuji Gotoh
  • Patent number: 8282853
    Abstract: A novel NiMnZn-based ferrite which can reduce magnetic loss (core loss) at a high frequency of about 2 MHz or higher and achieve higher saturated magnetic flux density while forming high sintered density is provided. The NiMnZn-based ferrite contains a main component comprising 54.0 to 57.5 mol % of iron oxide in terms of Fe2O3, 2.0 to 7.0 mol % of zinc oxide in terms of ZnO, 0.5 to 4.7 mol % of nickel oxide in terms of NiO, and a remainder of manganese oxide (in terms of MnO); and an accessory component comprising 100 to 1000 ppm by weight of Si in terms of SiO2, 800 to 3000 ppm by weight of Ca in terms of CaCO3, and 520 to 1000 ppm by weight of Nb in terms of Nb2O5 with respect to the main component; while having an average ferrite crystal particle size of 2.1 to 8.5 ?m.
    Type: Grant
    Filed: September 22, 2009
    Date of Patent: October 9, 2012
    Assignee: TDK Corporation
    Inventors: Kentaro Mori, Takuya Aoki
  • Patent number: 8263224
    Abstract: Disclosed is a resin composition containing a hexagonal ferrite and a resin, which is characterized in that the hexagonal ferrite is contained in an amount of 50-98 parts by weight per 100 parts by weight of the total of the resin composition.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: September 11, 2012
    Assignee: Asahi Kasei Chemicals Corporation
    Inventor: Tetsuji Tokiwa
  • Publication number: 20120225264
    Abstract: A magnetic fluid composition include a suspension of nano-particles including cross-crystallized multi-metal compounds dispersed in a solvent, the cross-crystallized multi-metal compounds including at least two or more metals having different valencies or oxidation states, the metals selected from the group consisting of a monovalent metal (Me+), a divalent metal (Me2+), a trivalent metal (Me3+), a quadrivalent metal (Me4+) and a rare earth metal. The magnetic fluid having a viscosity and surface tension that permits dispensing from an inkjet printer at a rate of at least 2.5 m/s, at a resolution of at least 600 dpi, supporting jetting pulse frequencies of at least 15 KHz per nozzle (enabling high speed inkjet printing applications of at least 0.6 m/sec per individual nozzle row per print head), and enabling uninterrupted, industrial level print output of magnetic ink character recognition (MICR) code lines suitable for high speed magnetic data scanning per established industry regulations (ANSI X9).
    Type: Application
    Filed: March 1, 2012
    Publication date: September 6, 2012
    Inventor: Thomas Villwock