Patents Examined by Xiaowei Su
  • Bulk anisotropic exchange-spring magnets and method of producing the same
    Patent number: 11145445
    Abstract: A method of preparing a permanent magnet nanocomposite. The method includes melting a precursor alloy having a hard magnetic phase and a magnetically soft phase. The hard magnetic phase has less than a stoichiometric amount of rare earth metal or noble metal. The melted precursor is cast into flakes and milled into a powder. The powder may then be pressure crystalized.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: October 12, 2021
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventor: Zafer Turgut
  • R-T-B based permanent magnet
    Patent number: 11120931
    Abstract: An object of the present invention is to provide an R-T-B based permanent magnet having a low coercive force and a low magnetizing field, and having a high residual magnetic flux density and a high minor curve flatness even in the low magnetizing field. Provided is an R-T-B based permanent magnet including a main phase crystal grain including a compound having an R2T14B type tetragonal structure and a grain boundary phase existing between the main phase crystal grains, in which R is at least one rare earth element including scandium and yttrium, T is at least one transition metal element including iron, or at least two transition metal elements including iron and cobalt, an average diameter D50 of the main phase crystal grain is 1.00 ?m or less, and a content of carbon included in the R-T-B based permanent magnet is 3,000 ppm or more.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: September 14, 2021
    Assignee: TDK CORPORATION
    Inventors: Shota Miyazaki, Keiji Takeda
  • Magnet material, permanent magnet, motor, and power generator
    Patent number: 11114224
    Abstract: A magnet material of an embodiment includes a composition represented by a formula 1: (Fe1-x-yCoxTy)2(B1-aAa)b, and a metallic structure having a CuAl2 crystal phase as a main phase. T is at least one element selected from V, Cr, and Mn. A is at least one element selected from C, N, Si, S, P, and Al. An atomic ratio x of Co and an atomic ratio y of the element T satisfy 0.01?y?0.5 and x+y?0.5. When the element T includes at least one element selected from V and Cr, a total atomic ratio of V and Cr is 0.03 or more. When the element T includes Mn, an atomic ratio of Mn is 0.3 or less. An atomic ratio a of the element A satisfies 0?a?0.4. A total atomic ratio b of B and the element A satisfies 0.8?b?1.2.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: September 7, 2021
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masaki Endo, Yasutaka Nishida, Shinya Sakurada, Keiko Okamoto, Fumihiko Aiga
  • High-chromium heat-resistant steel
    Patent number: 11105501
    Abstract: The present invention provides a high-chromium heat-resistant steel. The steel contains in mass %, C: 0.08% to 0.13%; Si: 0.15% to 0.45%; Mn: 0.1% to 1.0%; Ni: 0.01% to 0.5%; Cr: 10.0% to 11.5%; Mo: 0.3% to 0.6%; V: 0.10% to 0.25%; Nb: 0.01% to 0.06%; N: 0.015% to 0.07%; B: ?0.005%, and Al: ?0.04%. The balance consists of Fe and inevitable impurity elements. The steel shows a martensitic microstructure.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: August 31, 2021
    Assignee: Tenaris Connections B.V.
    Inventors: Yusuke Minami, Tatsuo Ono, Giuseppe Cumino, Paola Mariani
  • Magnesium oxide for annealing separator, and grain-oriented electromagnetic steel sheet
    Patent number: 11097955
    Abstract: An object of the present invention is to provide magnesium oxide for an annealing separator which is useful for obtaining grain-oriented electromagnetic steel sheets with excellent magnetic properties and insulating properties. To resolve the above object, an aspect of the present invention resides in magnesium oxide for an annealing separator having a Blaine specific surface area of 2.5×103 to 7.0×103 m2·kg?1 and CAA of 50 to 170 seconds.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: August 24, 2021
    Assignee: TATEHO CHEMICAL INDUSTRIES CO., LTD.
    Inventors: Masaki Kitagaki, Yutaka Hiratsu, Tadasuke Kamei
  • Artificial permanent magnet and method for producing the artificial permanent magnet
    Patent number: 11087907
    Abstract: A method is provided for producing an artificial permanent magnet, in a powder preparation step a main phase powder, which includes a rare-earth transition metal compound with permanently magnetic properties and has a first average particle size, is prepared and an anisotropic powder, which has a higher anisotropy field strength than the main phase powder and has a second average particle size, is prepared, wherein the second average particle size is smaller than the first average particle size. In a subsequent powder mixing step, the main phase powder and the anisotropic powder are mixed together to form a powder mixture and, in a subsequent heat treatment step, this powder mixture with the main phase powder of the first average particle size and with the anisotropic powder of the second average particle size is sintered to form an artificial permanent magnet.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: August 10, 2021
    Assignee: TECHNISCHE UNIVERSITÄT DARMSTADT
    Inventors: Konrad Löwe, Wilhelm Fernengel, Konstantin Skokov, Oliver Gutfleisch
  • Method and device for magnetic domain refinement of oriented electrical steel plate
    Patent number: 11072838
    Abstract: To optimize equipment and processes to enhance magnetic domain refinement efficiency and to enhance workability to improve processing capability, a method of refining a magnetic domain of a grain-oriented electrical steel plate includes zigzag controlling for transferring the steel plate without being inclined in right and left directions along a production line center, steel plate support roll position adjusting for controlling a position of the steel plate in up and down directions while supporting the steel plate, laser beam irradiating for irradiating a laser beam to a surface of the steel plate to melt the steel plate to form a groove in the surface of the steel plate, and removing for absorbing and removing radiant heat due to reflection of the laser beam irradiated to the surface of the steel plate during the laser beam irradiating.
    Type: Grant
    Filed: December 26, 2016
    Date of Patent: July 27, 2021
    Assignee: POSCO
    Inventors: Seung Ho Lim, Do Ryun Lee, Jin Ho Kim, Myung Sik Chun, Gyoo Taek Lee, Seong Cheol Hong
  • Systems and methods for non-contact tensioning of a metal strip
    Patent number: 11072843
    Abstract: Systems and methods of non-contact tensioning of a metal strip during metal processing include passing the metal strip adjacent a magnetic rotor. The magnetic rotor is spaced apart from the metal strip by a first distance. The systems and methods also include tensioning the metal strip through the magnetic rotor by rotating the magnetic rotor. Rotating the magnetic rotor induces a magnetic field into the metal strip such that the metal strip is tensioned in an upstream direction or a downstream direction. In other aspects, rotating the magnetic rotor induces a magnetic field into the metal strip such that a force normal to a surface of the metal strip is applied to the metal strip.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: July 27, 2021
    Assignee: NOVELIS INC.
    Inventors: Antoine Jean Willy Pralong, David Anthony Gaensbauer, Rodger Brown, William Beck, Andrew James Hobbis
  • Method for refining magnetic domains of grain-oriented electrical steel plates, and apparatus therefor
    Patent number: 11065720
    Abstract: By optimizing equipment and processing, magnetic domain miniaturization efficiency can be increased, workability can be improved, and processing ability can be increased through same. Provided is a method for miniaturizing the magnetic domains of a directional electric steel plate, the method comprising: a steel plate supporting roll position adjusting step of controlling the vertical direction position of a steel plate while supporting the steel plate progressing along a production line; and a laser emitting step of melting the steel plate by emitting a laser beam to form grooves on the surface of the steel plate and a removing steel plate surface step of to remove remaining spatters dropped on the surface of the steel plate after the laser emitting.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: July 20, 2021
    Assignee: POSCO
    Inventors: Seong Cheol Hong, Ki Young Min, Gyoo Taek Lee, Se min Park, Oh Yeoul Kwon, Jae Kyoum Kim
  • Method for refining magnetic domains of grain-oriented electrical steel plates, and apparatus therefor
    Patent number: 11060163
    Abstract: Provided is a method for refining magnetic domains of grain-oriented electrical steel plates including: a steel plate supporting roll position adjusting step of controlling a vertical direction position of the steel plate while supporting the steel plate; a laser radiating step of melting the steel plate by radiating a laser beam to form grooves on the surface of the steel plate; and a setting and maintaining step of setting and maintaining an internal operation environment of a laser room in which the laser radiation is performed, so as to increase magnetic domain refinement efficiency and improve workability by optimizing equipment and processes, thereby increasing the processing capacity.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: July 13, 2021
    Assignee: POSCO
    Inventors: Seong Cheol Hong, Jae Kyoum Kim, Ki Young Min, Se Min Park, Myung Sik Chun, Gyoo Taek Lee, Oh Yeoul Kwon, Hyun Chui Park
  • X80 pipeline steel with good strain-aging performance, pipeline tube and method for producing same
    Patent number: 11053563
    Abstract: A X80 pipeline steel with good strain-aging performance comprises (wt. %): C: 0.02-0.05%; Mn: 1.30-1.70%; Ni: 0.35-0.60%: Ti: 0.005-0.020%; Nb: 0.06-0.09%; Si: 0.10-0.30%; Al: 0.01-0.04%; N?0.008%; P?0.012%; S?0.006%; Ca: 0.001-0.003%, and balance iron and unavoidable impurities.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: July 6, 2021
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Mingzhuo Bai, Lei Zheng, Leilei Sun, Guodong Xu, Kougen Wu, Haisheng Xu
  • Separation of manganese bismuth powders
    Patent number: 11043319
    Abstract: A method of increasing volume ratio of magnetic particles in a MnBi alloy includes depositing a MnBi alloy powder containing magnetic particles and non-magnetic particles on a sloped surface having a magnetic field acted thereupon. The method further includes collecting falling non-magnetic particles while separated magnetic particles are magnetically retained on the sloped surface.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: June 22, 2021
    Assignee: Ford Global Technologies, LLC
    Inventors: Wanfeng Li, Feng Liang
  • Dust core
    Patent number: 11043320
    Abstract: A dust core includes a metal magnetic material, a resin, and an insulation film. The insulation film contacts with a surface of the metal magnetic material and covers the metal magnetic material. The insulation film includes a first film and a second film. The first film contacts with the surface of the metal magnetic material. The second film contacts with a surface of the first film. A density of the first film is higher than a density of the second film.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: June 22, 2021
    Assignee: TDK CORPORATION
    Inventors: Masahiro Kamiya, Yasuhide Yamashita, Chiomi Sato, Yousuke Futamata, Ryoma Nakazawa, Takeshi Takahashi, Hiroyuki Ono
  • Soft magnetic alloy powder, method for producing same, and dust core using soft magnetic alloy powder
    Patent number: 11037711
    Abstract: Provided herein is a soft magnetic alloy powder that can exhibit a high saturation flux density and desirable soft magnetic characteristics. A dust core using such a soft magnetic alloy powder is also provided. A soft magnetic alloy powder is used that includes an amorphous phase, and an ?Fe crystalline phase residing in the amorphous phase. The ?Fe crystalline phase has a crystallite volume distribution with a mode of 1 nm or more and 15 nm or less, and with a half width of 3 nm or more and 50 nm or less.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: June 15, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Masato Maede, Toshiyuki Kojima
  • Magnetic material and manufacturing method therefor
    Patent number: 11033958
    Abstract: Provided is a new magnetic material with high magnetic stability, as well as a manufacturing method therefor, said magnetic material having a higher saturation magnetization than ferrite-based magnetic materials, and having a higher electrical resistivity than existing metal-based magnetic materials, thus solving problems such as that of eddy current loss. Mn-ferrite nanoparticles obtained through wet synthesis are reduced within hydrogen, and grains are allowed to grow while simultaneously using a phase separation phenomenon due to a disproportionation reaction to produce a magnetic material powder in which an ?-(Fe, Mn) phase and a Mn-enriched phase are nano-dispersed. This powder is then sintered to produce a solid magnetic material.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: June 15, 2021
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Nobuyoshi Imaoka, Kimihiro Ozaki
  • Method for producing R-T-B sintered magnet
    Patent number: 11037724
    Abstract: A method of producing a sintered R-T-B based magnet includes providing a sintered R-T-B based magnet work, an RH compound (at least one selected from RH fluorides, RH oxides, and RH oxyfluorides), and an RL-Ga alloy, where the sintered magnet work contains R: 27.5 to 35.0 mass %, B: 0.80 to 0.99 mass %, Ga: 0 to 0.8 mass %, M: 0 to 2 mass % (where M is at least one of Cu, Al, Nb and Zr), and T: 60 mass % or more; a diffusion step of, while keeping the RH compound and the RL-Ga alloy in contact with a surface of the sintered magnet work, performing a first heat treatment between 700° C. and 950° C. to increase the RH amount contained in the sintered magnet work by between 0.05 mass % and 0.40 mass %; and performing a second heat treatment between 450° C. and 750° C. but which is lower than the first heat treatment.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: June 15, 2021
    Assignee: HITACHI METALS, LTD.
    Inventor: Futoshi Kuniyoshi
  • Alloy for R-T-B-based rare earth sintered magnet, process of producing alloy for R-T-B-based rare earth sintered magnet, alloy material for R-T-B-based rare earth sintered magnet, R-T-B-based rare earth sintered magnet, process of producing R-T-B-based rare earth sintered magnet, and motor
    Patent number: 11024448
    Abstract: An alloy for R-T-B-based rare earth sintered magnets which contains R which is a rare earth element; T which is a transition metal essentially containing Fe; a metallic element M containing one or more metals selected from Al, Ga and Cu; B and inevitable impurities, in which R accounts for 13 at % to 15 at %, B accounts for 4.5 at % to 6.2 at %, M accounts for 0.1 at % to 2.4 at %, T accounts for balance, a proportion of Dy in all rare earth elements is in a range of 0 at % to 65 at %, and the following Formula 1 is satisfied, 0.0049Dy+0.34?B/TRE?0.0049Dy+0.36??Formula 1 wherein Dy represents a concentration (at %) of a Dy element, B represents a concentration (at %) of a boron element, and TRE represents a concentration (at %) of all the rare earth elements.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: June 1, 2021
    Assignee: TDK CORPORATION
    Inventors: Kenichiro Nakajima, Takashi Yamazaki
  • Soft magnetic powder, powder magnetic core, magnetic element, and electronic device
    Patent number: 11017925
    Abstract: A soft magnetic powder has a composition represented by Fe100-a-b-c-d-e-fCuaSibBcMdM?eXf (at %) (wherein M is at least one element selected from the group consisting of Nb and the like, M? is at least one element selected from the group consisting of V and the like, X is at least one element selected from the group consisting of C and the like, and 0.1?a?3, 0<b?30, 0<c?25, 5?b+c?30, 0.1?d?30, 0?e?10, and 0?f?10). The powder contains a crystalline structure having a particle diameter of 1 nm or more and 30 nm or less in an amount of 40 vol % or more. When the apparent density is assumed to be 100, the tap density is 103 or more and 130 or less.
    Type: Grant
    Filed: April 10, 2018
    Date of Patent: May 25, 2021
    Inventor: Yasuko Kudo
  • Laser patterning of multi-layer structures
    Patent number: 11008644
    Abstract: A method of non-ablatively laser patterning a multi-layer structure, the multi-layer structure including a substrate, a first layer disposed on the substrate, a second layer disposed on the first layer, and a third layer disposed on the second layer, the method including generating at least one laser pulse having laser parameters selected for non-ablatively changing the conductivity a selected portion of the third layer such that the selected portion becomes non-conductive, and directing the pulse to the multi-layer structure, wherein the conductivity of the first layer is not substantially changed by the pulse.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: May 18, 2021
    Assignee: nLIGHT, Inc.
    Inventors: Adam Dittli, Robert J. Martinsen
  • Powder magnetic core, and coil component
    Patent number: 11011305
    Abstract: A method for manufacturing a powder magnetic core using a soft magnetic material powder, wherein the method has: a first step of mixing the soft magnetic material powder with a binder, a second step of subjecting a mixture obtained through the first step to pressure forming, and a third step of subjecting a formed body obtained through the second step to heat treatment. The soft magnetic material powder is an Fe—Cr—Al based alloy powder comprising Fe, Cr and Al. An oxide layer is formed on a surface of the soft magnetic material powder by the heat treatment. The oxide layer has a higher ratio by mass of Al to the sum of Fe, Cr and Al than an alloy phase inside the powder.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: May 18, 2021
    Assignee: HITACHI METALS, LTD.
    Inventors: Yoshimasa Nishio, Shin Noguchi, Kazunori Nishimura, Tetsuroh Katoh, Toshio Mihara