Patents Examined by Holly Rickman
  • 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
  • Patent number: 10006150
    Abstract: A kind of hydrophobic flame-retardant fiber and a preparation method thereof are provided by the present invention. The fiber has a skin-core structure, wherein, the volume ratio of skin to core is in a range of 2:8-6:4; weight percentages of compositions of skin layer material include: 79.9%-88.8% of PET (polyethylene terephthalate), 8%-13% of PVDF (polyvinylidene fluoride), 3%-6% of flame-retardant agent, 0.1%-0.5% of compatibilizer, 0.1%-0.6% of coupling agent; weight percentages of compositions of core layer material include: 91%-95% of PET, 5%-9% of flame-retardant agent.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: June 26, 2018
    Assignee: Bosideng Corporation Limited
    Inventors: Lu Qi, Zhijia Ding, Dekang Gao, Xiadong Gao
  • Patent number: 10008311
    Abstract: This invention relates to a magnetic composite powder, a method of preparing the same and an electromagnetic noise suppressing film comprising the same. The magnetic composite powder and the electromagnetic noise suppressing film can effectively suppress unwanted electromagnetic waves emitted by various parts of an advanced digital device having high performance characteristics in terms of speed, frequency and functionality.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: June 26, 2018
    Assignee: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Sang Woo Kim, Ji Hea Park, Yoon Bae Kim
  • Patent number: 10002632
    Abstract: A perpendicular recording medium with enhanced magnetic stability. In accordance with some embodiments, a multi-layer recording structure is formed on a base substrate and adapted to magnetically store a magnetic bit sequence in domains substantially perpendicular to said layers. A thin magnetic stabilization layer is formed on the multi-layer recording substrate to magnetically stabilize an upper portion of the recording structure.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: June 19, 2018
    Assignee: Seagate Technology LLC
    Inventors: Bo Bian, Weikang Shen, Pengcheng Li, Miaogen Lu, Connie Chunling Liu, Thomas Nolan
  • Patent number: 9994974
    Abstract: The present invention concerns fiber made from a polymer comprising imidazole groups, the polymer further having: i) halide anions being present in an amount in the range of 0.05 to 20.1 weight percent, based on weight of fiber; ii) sulfur, wherein the sulfur is present in the fiber in an amount in the range of 0.05 to 3 weight percent, based on weight of fiber; and iii) alkali metal ion, wherein the alkali metal ion is present in the fiber in an amount in the range of 0.05 to 2 weight percent, based on weight of fiber.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: June 12, 2018
    Assignee: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Steven R. Allen, Vlodek Gabara, Joseph Lenning Lowery, Christopher William Newton, David J. Rodini, Andrew J. Sitter
  • Patent number: 9988514
    Abstract: The present invention concerns fiber made from a polymer comprising imidazole groups, fiber further having: i) a halide anion, the halide anion being present in an amount of 0.05 to 20.1 weight percent, based on weight of fiber; and ii) sulfur, wherein the sulfur is present in the fiber in an amount of 0.05 to 3 weight percent.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: June 5, 2018
    Assignee: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Steven R. Allen, Vlodek Gabara, Joseph Lenning Lowery, Steven Raymond Lustig, Christopher William Newton, David J. Rodini, Andrew J. Sitter
  • Patent number: 9990940
    Abstract: A data storage medium having a seed structure formed of a first seed layer comprising a nickel alloy NiY, where Y is an element selected from Al, B, Fe, Nb, W, and Co, and a second seed layer represented by NiWAX, where A is an element selected from Al, B, Fe, Nb, and Co, and X is either B, Si, Ti, Nb, V, Cr, Ru, or an oxide, with the second seed layer being disposed on the first seed layer; and a magnetic recording layer above the seed structure. In addition, a method for manufacturing a data storage medium containing the aforementioned seed structure is also disclosed.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: June 5, 2018
    Assignee: WD Media, LLC
    Inventors: Kyongha Kang, Daehoon Hong, Sy Vu, Chester C. H. Lo
  • Patent number: 9984715
    Abstract: A magnetic disk of is provided, the magnetic disk having at least a magnetic layer, a carbon protective layer, and a lubrication layer sequentially provided on a substrate. In an embodiment, the lubrication layer a film formed by a lubricant having a perfluoropolyether compound A having a perfluoropolyether main chain in the structure and also having a hydroxyl group at the end and a compound C obtained from a reaction between a compound B expressed by: [Chemical formula 1] CF3(—O—C2F4)m-(O—CF2)n-OCF3 [m and n in the formula are natural numbers.] and aluminum oxide.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: May 29, 2018
    Assignee: WD Media, LLC
    Inventors: Koichi Shimokawa, Katsushi Hamakubo, Kae Itoh
  • Patent number: 9984711
    Abstract: The magnetic recording medium comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, and further comprises a compound denoted by Formula (1): wherein, in Formula (1), X denotes —O—, —S—, or NR1—; each of R and R1 independently denotes a hydrogen atom or a monovalent substituent; L denotes a divalent connecting group; Z denotes a partial structure of valence n comprising at least one group selected from the group consisting of carboxyl groups and carboxylate groups; m denotes an integer of greater than or equal to 2, and n denotes an integer of greater than or equal to 1.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: May 29, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Toshihide Aoshima, Wataru Kikuchi, Kazutoshi Katayama, Tatsuo Mikami
  • Patent number: 9982118
    Abstract: Provided is a flame retardant resin composition including a base resin, calcium carbonate particles that are incorporated at a proportion of 10 parts by mass or more relative to 100 parts by mass of the base resin, a silicone-based compound that is incorporated at a proportion of more than 1 part by mass relative to 100 parts by mass of the base resin, and a fatty acid-containing compound that is incorporated at a proportion of more than 3 parts by mass relative to 100 parts by mass of the base resin. The average particle size of the calcium carbonate particles is 0.7 ?m or larger.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: May 29, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Masayuki Iwata, Tomohisa Watanabe, Kazuya Hoshino
  • Patent number: 9978413
    Abstract: A multilayer exchange spring recording media consists of a magnetically hard magnetic storage layer strongly exchange coupled to a softer nucleation host. The strong exchange coupling can be through a coupling layer or direct. The hard magnetic storage layer has a strong perpendicular anisotropy. The nucleation host consists of one or more ferromagnetic coupled layers. For a multilayer nucleation host the anisotropy increases from layer to layer. The anisotropy in the softest layer of the nucleation host can be two times smaller than that of the hard magnetic storage layer. The lateral exchange between the grains is small. The nucleation host decreases the coercive field significantly while keeping the energy barrier of the hard layer almost unchanged. The coercive field of the total structure depends on one over number of layers in the nucleation host. The invention proposes a recording media that overcomes the writeability problem of perpendicular recording media.
    Type: Grant
    Filed: June 17, 2006
    Date of Patent: May 22, 2018
    Inventor: Dieter Suess