Patents Examined by Holly Rickman
  • Patent number: 10971182
    Abstract: Magnetic powder includes: at least one epsilon-phase iron oxide-based compound selected from the group consisting of ?-Fe2O3 and a compound represented by Formula (1); and a surface treatment layer including a silane compound on at least a part of a surface. The magnetic powder has an average particle diameter of 8 nm to 20 nm. The content ratio of carbon atoms of the silane compound included in the surface treatment layer to iron atoms of the at least one epsilon-phase iron oxide-based compound selected from the group consisting of ?-Fe2O3 and the compound represented by Formula (1) is 0.05% to 0.5% in terms of the number of atoms. A manufacturing method thereof and applications thereof are also provided. In Formula (1), A represents at least one metal element other than Fe and a represents a number that satisfies a relationship of 0<a<2.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: April 6, 2021
    Assignee: FUJIFILM Corporation
    Inventor: Takashi Fujimoto
  • Patent number: 10964444
    Abstract: The present invention aims to provide a resin composition which can provide a molded article excellent in insulation and showing a low relative permittivity and which causes no melt fracture even when extrusion-molded at a high shear rate. The resin composition of the present invention includes an aromatic polyether ketone resin (I) and a fluororesin (II). The fluororesin (II) is a copolymer of tetrafluoroethylene and a perfluoro ethylenically unsaturated compound represented by the following formula (1): CF2?CF—Rf1??(1) wherein Rf1 represents —CF3 or —ORf2; and Rf2 represents a C1-C5 perfluoroalkyl group. The aromatic polyether ketone resin (I) and the fluororesin (II) satisfy a melt viscosity ratio (I)/(II) of not lower than 0.001 but lower than 0.3.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: March 30, 2021
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Yuki Ueda, Masami Nishiumi, Haruhisa Masuda
  • Patent number: 10950365
    Abstract: An insulated wire includes a conductor, a first insulation coating layer which is provided directly on the conductor and includes a polyamide-imide resin including dispersed inorganic fine particles, and a second insulation coating layer which is provided on the outer circumference of the first insulation coating layer and includes a polyamide-imide resin or a polyimide resin. A minimum winding multiplied diameter that does not cause a crack in the first insulation coating layer when the insulated wire is elongated by 30% by a method in compliance with JISC 3216 “5.1.1” and is wound around a winding bar is greater than 2d but smaller than 4d (where d is a conductor diameter of the insulated wire).
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: March 16, 2021
    Assignee: HITACHI METALS, LTD.
    Inventors: Hidehito Hanawa, Hideyuki Kikuchi
  • Patent number: 10947644
    Abstract: Provided are a C-shaped composite fiber, a C-shaped hollow fiber using the same, a fabric including the C-shaped composite fiber and/or the C-shaped hollow fiber, and a manufacturing method of the C-shaped composite fiber, the C-shaped hollow fiber, and/or the fabric, and more particularly, to a C-shaped composite fiber which has excellent strength and elongation together with improved hollowness, so that there is little deformation of the composite fiber and/or the hollow fiber in the manufacturing process thereof, quality degradation of the hollow fiber is minimized in the elution process thereof, a weight reduction process in a fabric state is not required when manufacturing the fabric, and the manufactured fabric has excellent warmth and lightness, a C-shaped hollow fiber using the same, a fabric including the C-shaped composite fiber and/or the C-shaped hollow fiber, and a manufacturing method of the C-shaped composite fiber, the C-shaped hollow fiber, and/or the fabric.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: March 16, 2021
    Assignee: TORAY ADVANCED MATERIALS KOREA INC.
    Inventors: Dong Won Kim, Jin Suk Ma, Hyoun Soo Lee, Mi Nam Choi, Ho Keun Kim, Jae Wook Hong
  • Patent number: 10937456
    Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 ?m, the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°, and the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 55.0°.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: March 2, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Takuto Kurokawa, Masahito Oyanagi
  • Patent number: 10937457
    Abstract: There is provided a magnetic recording medium of which an average thickness tT is tT?5.6 ?m, a dimensional change amount ?w in a width direction with respect to a change in tension in a longitudinal direction is 660 ppm/N??w, a squareness ratio in a vertical direction is 65% or more, and a width deformation coefficient b during long-term storage in a case where a long-term storage width change amount Y is defined as Y=blog(t) is ?0.06 ?m?b?0.06 ?m.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: March 2, 2021
    Assignee: Sony Corporation
    Inventors: Minoru Yamaga, Noboru Sekiguchi, Tooru Sato, Takashi Aizawa
  • Patent number: 10930313
    Abstract: According to one embodiment, a magnetic recording medium includes: a substrate; and a magnetic recording layer structure formed above the substrate. The magnetic recording layer structure includes five or more magnetic recording layers and four or more nonmagnetic exchange coupling layers, where the magnetic recording layers and the nonmagnetic exchange coupling layers are arranged in an alternating pattern, and where the magnetic recording layers are separated from each other by least one of the nonmagnetic exchange coupling layers. The magnetic recording layer positioned closest to the substrate has each of the following: an average magnetic grain pitch of about 8.3 nm or less, a magnetic anisotropy field (Hk) value of greater than or equal to about 20 kOe, and a thickness that is about 40% of a total thickness of the magnetic recording layer structure.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: February 23, 2021
    Assignee: Western Digital Technologies, Inc.
    Inventor: Yoshihiro Ikeda
  • Patent number: 10923147
    Abstract: Magnetic media including a magnetic recording layer structure of at least six magnetic recording sublayers and at least six non-magnetic exchange control sublayers in an alternating pattern are provided. The magnetic recording layer structure includes a gradient of platinum content across the magnetic recording sublayers such that a top magnetic recording sublayer has a lowest platinum content and a bottom magnetic recording sublayer has a highest platinum content. In one such case, the magnetic media includes a substrate and the magnetic recording layer structure on the substrate. In another case, a method of fabricating such magnetic media is provided.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: February 16, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Kai Tang, Arien Michael Ghaderi, Tuqiang Li, Chi Ho Lo
  • Patent number: 10923148
    Abstract: There is provided a magnetic recording medium which has a layer structure including a magnetic layer and a base layer, and of which an average thickness tT is tT?5.6 ?m, a dimensional change amount ?w in a width direction with respect to a change in tension in a longitudinal direction is 660 ppm/N??w, a servo pattern is recorded on the magnetic layer, a standard deviation ?PES of a position error signal (PES) value obtained from a servo signal in which the servo pattern is reproduced is ?PES?25 nm, and a maximum value ?1M of a friction coefficient ?1 between a surface on a side of the magnetic layer and an LTO3 head in a case where measurement of the friction coefficient ?1 is performed 250 times is 0.04??1M?0.5.
    Type: Grant
    Filed: November 14, 2019
    Date of Patent: February 16, 2021
    Assignee: Sony Corporation
    Inventors: Taikei Enomoto, Masaru Terakawa, Minoru Yamaga
  • Patent number: 10889917
    Abstract: A spinneret is used to reduce filament breakage during spinning of multifilament yarn being stretched at a high stretch ratio. The spinneret has a first group of spinning holes with capillaries and a second group of spinning holes with capillaries. The capillaries of the second group of spinning holes have a lower length to diameter (L/D) ratio than the capillaries of the first group of spinning holes. All of the capillaries have the same diameter, which is 100 ?m or less.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: January 12, 2021
    Assignee: TEIJIN ARAMID B.V.
    Inventors: Leonardus Antonius Godfried Busscher, Michiel Jan Adriaan Jaarsveld
  • Patent number: 10096333
    Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer comprising ferromagnetic powder and binder on the nonmagnetic layer, wherein the magnetic layer further comprises carbon black, and a state in which the carbon black is present, as observed in a reflection electron image of a surface of the magnetic layer obtained by a scanning electron microscope, satisfies condition 1 and condition 2 below: condition 1: a number of carbon black particles with a particle size of greater than or equal to 140 nm is greater than or equal to 30 per 1,000 ?m2 of area; and condition 2: a number of carbon black particles with a particle size of greater than or equal to 220 nm is less than or equal to 10 per 1,000 ?m2 of area.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: October 9, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Yoshinori Tamada, Masahide Sato, Kazufumi Omura
  • Patent number: 10079036
    Abstract: A magnetic recording medium 11 in which the outermost surface of a protective layer 3 on a lubricant layer 4 side contains carbon and nitrogen of 10 atomic % to 90 atomic %, the lubricant layer 4 is formed by being in contact with the outermost surface, and contains a compound A of Formula (1) and a compound B of Formula (2), a mass ratio (A/B) of the compound A with respect to the compound B is 0.2 to 0.3, the average molecular weights of the compounds A and B are 1,500 to 2,000 and 1,300 to 2,400, respectively, and the average film thickness is 0.5 nm to 2 nm. R1-C6H4OCH2CH(OH)CH2OCH2—R2-CH2OCH2CH(OH)CH2OH ??(1) (R1 is an alkoxy group having 1 to 4 carbon atoms. R2 is —CF2O(CF2CF2O)x(CF2O)yCF2—).
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: September 18, 2018
    Assignee: SHOWA DENKO K.K.
    Inventors: Satoru Nakamura, Taining Hung, Evance Kuo, Daizo Endo
  • Patent number: 10074396
    Abstract: In a magnetic recording medium of the present invention, an outermost surface of a protective layer 3 on a lubricant layer 4 side contains carbon and nitrogen in a range of 50 atomic % to 90 atomic %, and the lubricant layer 4 is formed by being in contact with the outermost surface, contains compounds A to C represented in the below general formulas (1) to (3) described below, and has a film thickness of 0.5 nm to 2 nm.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: September 11, 2018
    Assignee: SHOWA DENKO K.K.
    Inventors: Eishin Yamakawa, Katsuaki To, Saeko Hayase
  • Patent number: 10068603
    Abstract: A magnetic recording medium includes a nonmagnetic substrate and at least a magnetic layer, a protective layer, and a lubricating layer provided on the nonmagnetic substrate. The magnetic recording medium is characterized in that the lubricating layer is formed of a lubricating agent represented by general formulas (1), (2) or (3), in which substituents R1, R2, R3, and R4 in the lubricating agent represent organic groups, at least one of the substituents R1 and R2 at the end part of the lubricating agent and the substituents R3 and R4 contain a plurality of functional groups, and the shortest distance between the functional groups is a distance of three or more atoms, preferably five atoms. The magnetic recording medium may be used for a heat assisted recording method in which the temperature of the magnetic layer reaches 150° C. to 200° C.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: September 4, 2018
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Kunihiro Imai, Takako Matsumoto, Takeshi Watanabe, Akira Furuta, Kazuhiro Kusakawa, Masami Kuroda
  • Patent number: 10056102
    Abstract: According to one embodiment, a magnetic recording medium including a substrate and a magnetic recording layer formed on the substrate and including a plurality of projections is obtained. The array of the plurality of projections includes a plurality of domains in which the projections are regularly arranged, and a boundary region between the domains, in which the projections are irregularly arranged. The boundary region is formed along a perpendicular bisector of a line connecting the barycenters of adjacent projections.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: August 21, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kaori Kimura, Kazutaka Takizawa, Akira Watanabe, Takeshi Iwasaki, Akihiko Takeo
  • Patent number: 10047091
    Abstract: A lubricating agent including an ionic liquid formed from a Bronsted acid (HX) and a Bronsted base (B), wherein the Bronsted base has a linear hydrocarbon group having 10 or more carbon atoms and the difference between the pKa value of the Bronsted acid in water and the pKa value of the Bronsted base in water is 12 or more.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: August 14, 2018
    Assignee: Dexerials Corporation
    Inventors: Hirofumi Kondo, Kouki Hatsuda, Nobuo Tano, Makiya Ito, Kyungsung Yun, Masayoshi Watanabe
  • Patent number: 10026430
    Abstract: The magnetic tape comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder, nonmagnetic powder, and binder, wherein a total thickness of the magnetic tape is less than or equal to 4.80 ?m, and a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35.
    Type: Grant
    Filed: September 28, 2015
    Date of Patent: July 17, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Masahito Oyanagi, Toshio Tada, Yasuhiro Kawatani
  • Patent number: 10026432
    Abstract: A magnetic stack includes a interlayer structure and a magnetic recording layer disposed over the interlayer in the magnetic stack. The magnetic recording layer includes substantially ordered L10, <001> oriented crystalline magnetic grains laterally separated by a nonmagnetic, segregant material. The interlayer structure comprises a first layer having cubic crystal structure including <100> oriented crystalline grains and a second layer having crystalline grains laterally separated by a segregant material. The crystalline grains of the second layer are arranged in substantially vertically contiguous alignment with the crystalline grains of the first layer and the segregant material of the magnetic recording layer is arranged in substantially vertically contiguous alignment with the segregant material of the second layer.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: July 17, 2018
    Assignee: Seagate Technology LLC
    Inventors: Thomas P. Nolan, Kai Chieh Chang, Yukiko Kubota, Yingguo Peng, Jan-Ulrich Thiele
  • Patent number: 10026429
    Abstract: A perpendicular type of magnetic recording medium has a multi-layered recording structure made up of a plurality of ferro-magnetic layers and a non-magnetic layer interposed between the plurality of ferro-magnetic layers, and the perpendicular magnetic anisotropy energy of the lower ferro-magnetic layer is greater than the perpendicular magnetic anisotropy energy of the upper ferro-magnetic layer. Accordingly, the lower ferro-magnetic layer may be easily magnetically reversed by a magnetic field applied during a write operation. Thus, the perpendicular type of magnetic recording medium exhibits an enhanced thermal stability and write-ability.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: July 17, 2018
    Assignee: Seagate Technology LLC
    Inventors: Sok-hyun Kong, Hoo-san Lee, Sadayuki Watanabe, Shunji Takenoiri
  • Patent number: 10014045
    Abstract: Magnetic memories and methods are disclosed. A magnetic memory as described herein includes a plurality of stacked data storage layers to form a three-dimensional magnetic memory. The data storage layers are each formed from a multi-layer structure. At ambient temperatures, the multi-layer structures exhibit an antiparallel coupling state with a near zero net magnetic moment. At higher transition temperatures, the multi-layer structures transition from the antiparallel coupling state to a parallel coupling state with a net magnetic moment. At yet higher temperatures, the multi-layer structure transitions from the antiparallel coupling state to a receiving state where the coercivity of the multi-layer structures drops below a particular level so that magnetic fields from write elements or neighboring data storage layers may imprint data into the data storage layer.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: July 3, 2018
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Olav Hellwig, Bruce D. Terris, Jan-Ulrich Thiele