Patents by Inventor Hiroyuki Nakagawa

Hiroyuki Nakagawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20160346438
    Abstract: [Problem] To provide a composition capable of effectively preventing adhesion. [Solution] An adhesion-preventing preparation comprising, as an active ingredient, a composition comprising an A-B-A triblock copolymer, in which A denotes a cationically chargeable polymer block and B denotes a water-soluble block that comprises a poly(ethylene glycol) (or poly(oxyethylene)) chain, and a polyanionic polymer.
    Type: Application
    Filed: January 27, 2015
    Publication date: December 1, 2016
    Applicant: UNIVERSITY OF TSUKUBA
    Inventors: Yukio NAGASAKI, Hiroyuki NAKAGAWA
  • Patent number: 9406328
    Abstract: In one embodiment, a perpendicular magnetic recording medium includes: a substrate; and a soft magnetic underlayer structure positioned above the substrate, where the soft magnetic underlayer includes: a coupling layer; a first soft underlayer positioned above the coupling layer; and a second soft underlayer positioned below the coupling layer, where a difference between a magnetic flux density of the soft magnetic underlayer structure at 25° C. and a magnetic flux density of the soft underlayer structure at 85° C. is less than or equal to about 10% of the magnetic flux density of the soft magnetic underlayer structure at 25° C.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: August 2, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Shun Tonooka, Masayoshi Shimizu, Hiroyuki Nakagawa, Kiwamu Tanahashi
  • Publication number: 20160035381
    Abstract: A perpendicular magnetic recording medium with an grain isolation layer is disclosed. In one embodiment, a perpendicular magnetic recording medium comprises a substrate, a soft non-magnetic under layer formed over the substrate, a granular layer comprising an exchange control layer and a recording layer formed over the soft non-magnetic under layer, wherein a difference between a level at 25 deg C. and a level at 85 deg C. of a slope at a coercivity of a magnetization process curve having saturation magnetization normalized at 1 is obtained when a magnetic field is applied perpendicular to said medium, is 10% or less.
    Type: Application
    Filed: August 1, 2014
    Publication date: February 4, 2016
    Inventors: Shun TONOOKA, Masayoshi SHIMIZU, Hiroyuki NAKAGAWA, Kiwamu TANAHASHI
  • Publication number: 20160035380
    Abstract: In one embodiment, a perpendicular magnetic recording medium includes: a substrate; and a soft magnetic underlayer structure positioned above the substrate, where the soft magnetic underlayer includes: a coupling layer; a first soft underlayer positioned above the coupling layer; and a second soft underlayer positioned below the coupling layer, where a difference between a magnetic flux density of the soft magnetic underlayer structure at 25° C. and a magnetic flux density of the soft underlayer structure at 85° C. is less than or equal to about 10% of the magnetic flux density of the soft magnetic underlayer structure at 25° C.
    Type: Application
    Filed: July 29, 2014
    Publication date: February 4, 2016
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Shun Tonooka, Masayoshi Shimizu, Hiroyuki Nakagawa, Kiwamu Tanahashi
  • Patent number: 9162936
    Abstract: It is to provide a method for manufacturing a hydrocarbon, with which a hydrocarbon is produced at a high yield even under the condition of an ordinary temperature and an ordinary pressure. A method for manufacturing a hydrocarbon, in which carbon dioxide is reduced to produce the hydrocarbon, the method includes a step of producing the hydrocarbon by bringing magnesium or a magnesium compound such as magnesium oxide into contact with water and the carbon dioxide and reducing the carbon dioxide. Examples of the magnesium compound include magnesium oxide, magnesium hydroxide, magnesium carbonate, and basic magnesium carbonate.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: October 20, 2015
    Assignee: TOYODA GOSEI CO., LTD.
    Inventors: Hiroyuki Nakagawa, Seitaro Taki, Hisashi Mizuno
  • Publication number: 20150294679
    Abstract: In one embodiment, a perpendicular magnetic recording medium includes an oxide recording layer including an oxide and a non-oxide recording layer which does not contain an oxide positioned above the oxide recording layer. The oxide recording layer includes a first recording layer, a second recording layer, a third recording layer, and a fourth recording layer. Also, an oxide concentration of the first recording layer is greater than an oxide concentration of the second recording layer, an oxide concentration of the third recording layer is greater than an oxide concentration of the fourth recording layer, and the oxide concentration of the third recording layer is greater than the oxide concentration of the second recording layer.
    Type: Application
    Filed: June 2, 2015
    Publication date: October 15, 2015
    Inventors: Shun Tonooka, Kiwamu Tanahashi, Hiroyuki Nakagawa, Ichiro Tamai
  • Publication number: 20150262603
    Abstract: A perpendicular magnetic recording medium with an grain isolation layer is disclosed. In one embodiment, a perpendicular magnetic recording medium comprising a substrate, a soft magnetic under layer formed over the substrate, a seed layer comprising an upper layer and a lower layer formed over the soft magnetic underlayer, an intermediate layer formed of Ru or an Ru alloy formed over the seed layer and a recording layer formed over the intermediate layer, forming a grain isolation layer on the upper layer of the seed layer is provided.
    Type: Application
    Filed: March 14, 2014
    Publication date: September 17, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Shun Tonooka, Masayoshi Shimizu, Ichiro Tamai, Hiroyuki Nakagawa
  • Patent number: 9099140
    Abstract: In order to provide a thermal energy assisted medium capable of improving anti-sliding reliability over long periods of time in low flying head conditions, while also maintaining a high SNR, a unique medium is proposed. A soft magnetic layer is formed on a substrate, a soft magnetic layer is formed thereon via a non-magnetic intermediate layer, and an intermediate layer, a crystal oriented control intermediate layer, an artificial lattice intermediate layer having an artificial lattice film in which a first layer comprising Co and a second layer comprising Pt and Pd are laminated repeatedly to form a recording layer, and a cap layer and an lubricating layer are formed. The concentration of Pd comprising the second layer is from about 20 atomic % to about 40 atomic %. Other mediums and systems are also described.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: August 4, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Hiroaki Nemoto, Hiroyuki Nakagawa, Takayuki Ichihara, Masae Suzuki
  • Patent number: 9090524
    Abstract: The present invention provides a method for manufacturing a hydrocarbon, the method including bringing metal Mg into contact with water and carbon dioxide and reducing the carbon dioxide. In the method, one or more elements selected from the group consisting of Group 8 elements, Group 9 elements, B, C, S, Ca, V, Mn, Ni, Ge, Zr, Nb, Pd, Ag, Sn, Pt, Au, and Ce are used as combination element(s), and the contact is effected under presence of one or more of simple substance(s) of the combination element(s), water-soluble compound(s) of the combination element(s), and ion(s) of the combination element(s).
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: July 28, 2015
    Assignee: TOYODA GOSEI CO., LTD.
    Inventors: Hiroyuki Nakagawa, Seitaro Taki, Hisashi Mizuno
  • Patent number: 9057352
    Abstract: A wave power generation device for synchronizing a vertical movement of a float with all the wave periods, and a method of controlling the same. The device has a controller which controls a torque of a power generator, and the controller is configured to estimate a displacement and a speed of a float from data of a rotation number or a rotation speed of the power generator, to estimate a wave period from the displacement and the speed, and to determine a displacement coefficient corresponding to the wave period from a data table stored in advance, and to transmit a calculated product of the displacement coefficient and the displacement as a torque command to the power generator so as to control a torque of the power generator.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: June 16, 2015
    Assignee: MITSUI ENGINEERING & SHIPBUILDING CO., LTD.
    Inventors: Kunio Nakano, Hiroyuki Nakagawa, Shogo Miyajima, Takashi Kawaguchi
  • Patent number: 9058831
    Abstract: In one embodiment, a perpendicular magnetic recording medium includes an oxide recording layer including an oxide and a non-oxide recording layer which does not contain an oxide positioned above the oxide recording layer. The oxide recording layer includes a region R1 where a grain boundary width in a direction parallel to a plane of formation of R1 increases therealong from a lowermost portion of the oxide recording layer toward a medium surface, a region R3 positioned above R1 wherein a grain boundary width increases therealong toward the medium surface, a region R2 where a grain boundary width of R2 decreases therealong from R1 to R3, with R2 being positioned between R1 and R3, and a region R4 where a grain boundary width of R4 decreases therealong from R3 toward the medium surface, with R4 being positioned above R3 and near an uppermost portion of the oxide recording layer.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: June 16, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Shun Tonooka, Kiwamu Tanahashi, Hiroyuki Nakagawa, Ichiro Tamai
  • Publication number: 20150126630
    Abstract: It is to provide a method for manufacturing a hydrocarbon, with which a hydrocarbon is produced at a high yield even under the condition of an ordinary temperature and an ordinary pressure. A method for manufacturing a hydrocarbon, in which carbon dioxide is reduced to produce the hydrocarbon, the method includes a step of producing the hydrocarbon by bringing magnesium or a magnesium compound such as magnesium oxide into contact with water and the carbon dioxide and reducing the carbon dioxide. Examples of the magnesium compound include magnesium oxide, magnesium hydroxide, magnesium carbonate, and basic magnesium carbonate.
    Type: Application
    Filed: January 17, 2013
    Publication date: May 7, 2015
    Inventors: Hiroyuki Nakagawa, Seitaro Taki, Hisashi Mizuno
  • Publication number: 20150025159
    Abstract: The present invention provides a method for manufacturing a hydrocarbon, the method including bringing metal Mg into contact with water and carbon dioxide and reducing the carbon dioxide. In the method, one or more elements selected from the group consisting of Group 8 elements, Group 9 elements, B, C, S, Ca, V, Mn, Ni, Ge, Zr, Nb, Pd, Ag, Sn, Pt, Au, and Ce are used as combination element(s), and the contact is effected under presence of one or more of simple substance(s) of the combination element(s), water-soluble compound(s) of the combination element(s), and ion(s) of the combination element(s).
    Type: Application
    Filed: June 17, 2014
    Publication date: January 22, 2015
    Inventors: Hiroyuki NAKAGAWA, Seitaro TAKI, Hisashi MIZUNO
  • Publication number: 20150017725
    Abstract: A polyurethane porous membrane is produced by a simple method to be used for at least one of applications of cell culture and cancer cell growth inhibition. The production method of the polyurethane porous membrane to be used for at least one of the applications of cell culture and cancer cell growth inhibition comprises: a first step of forming a layer of a polyurethane material which is uncured, on a substrate; and a second step of supplying water vapor to an exposed surface of the layer of the polyurethane material formed on the substrate, which is away from the substrate, so as to cure the polyurethane material and provide the layer of the polyurethane material with a porous structure having a plurality of irregularities on the exposed surface.
    Type: Application
    Filed: July 1, 2014
    Publication date: January 15, 2015
    Inventors: Seitaro TAKI, Hisashi MIZUNO, Hiroyuki NAKAGAWA, Toshiyuki HAGIYAMA, Atsuki YOSHIMURA, Masaru TANAKA, Ayano SASAKI, Toshifumi TAKAHASHI, Tsuyoshi OHTA
  • Patent number: 8795478
    Abstract: Embodiments of the invention provide a manufacturing method which permits a high quality perpendicular magnetic recording medium to be manufactured with a high yield by preventing abnormal discharge which sputters particles from the target. In one embodiment, while the perpendicular magnetic recording medium is formed, DC pulses are applied to the target. During the reversal period (Reversal Time) between sputtering periods, a voltage of the opposite polarity is applied. During the sputtering period, a negative voltage is applied which biases the target surface to a negative potential, causing Ar+ to collide with and sputter CoCrPt and SiO2 for deposition on the intermediate layer. The top surface of the insulation material (SiO2) on the target is charged by Ar+ to have a voltage larger than the target voltage. However, arcing can be prevented since the charge on the surface of the insulation material is neutralized due to a positive voltage applied to the target during the non-sputtering period.
    Type: Grant
    Filed: October 18, 2005
    Date of Patent: August 5, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Yoshinori Honda, Takayuki Ichihara, Hiroyuki Nakagawa, Kiwamu Tanahashi
  • Publication number: 20140197637
    Abstract: A wave power generation device which eliminates addition of an adjustment mechanism relating to a change in a mass or a shape to a float and an external sensor such as a wave meter and can improve power generation efficiency by synchronizing a vertical movement of the float with all the wave periods while a manufacturing cost of the wave power generation device is suppressed and a method of controlling the same are provided.
    Type: Application
    Filed: January 16, 2014
    Publication date: July 17, 2014
    Applicant: MITSUI ENGINEERING & SHIPBUILDING CO., LTD.
    Inventors: Kunio Nakano, Hiroyuki Nakagawa, Shogo Miyajima, Takashi Kawaguchi
  • Patent number: 8709618
    Abstract: According to embodiments of the present invention, a shielded pole writer and a perpendicular magnetic recording medium suitable thereto are combined to provide high medium SNR and excellent OW characteristic simultaneously. A perpendicular magnetic recording medium of a magnetic storage apparatus mounting a shielded pole writer, including a perpendicular magnetic recording medium having a recording layer of a three layered structure is used. A first recording layer has a granular structure consisting of grain boundaries containing an oxide and columnar grains comprising a CoCrPt alloy, in which a second recording layer and a third recording layer formed thereabove comprise Co as a main ingredient, contain Cr and do not contain an oxide, and the Cr concentration in the second recording layer is lower than the Cr concentration in the third recording layer.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: April 29, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Ikuko Takekuma, Hiroyuki Nakagawa, Hiroaki Nemoto, Yoshiyuki Hirayama
  • Patent number: 8705208
    Abstract: According to one embodiment, a PMRM includes a substrate, a soft magnetic underlayer above the substrate, an underlayer above the soft magnetic underlayer, an oxide-containing magnetic layer above the underlayer, and a ferromagnetic layer above the magnetic layer having no oxides. The underlayer controls orientation and segregation of the magnetic layer. The oxide-containing magnetic layer comprises at least two or more magnetic layers, a Cr concentration of the magnetic layer adjacent to the ferromagnetic metal layer is between about 23 at. % and about 32 at. %, and a difference between the Cr concentration of the magnetic layer adjacent to the ferromagnetic metal layer and a magnetic layer having a lowest Cr concentration among the at least three magnetic layers is less than about 25 at. %, the magnetic layer with a lowest Cr concentration has a granular structure, and a nucleation field is greater than about 159.2 kA/m.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: April 22, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Hiroyuki Nakagawa, Reiko Arai, Ichiro Tamai, Kiwamu Tanahashi
  • Patent number: 8669718
    Abstract: An LED lighting device includes: a power source unit for supplying the DC output voltage to a light-emitting diode; a control unit for adjusting the DC output voltage; and a control power source unit for supplying a control power to the control unit. The control power source unit generates the control power with the DC output voltage and has: a current-limiting resistor for limiting an electric current that flows from the power source unit to the control unit; a constant voltage unit for converting a voltage to be applied to the control unit through the current-limiting resistor unit to a constant voltage; and a switching unit for switching a resistance value of the current-limiting resistor unit among a plurality of resistance values.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: March 11, 2014
    Assignee: Panasonic Corporation
    Inventors: Masafumi Yamamoto, Katunobu Hamamoto, Hiroyuki Asano, Hisaya Takikita, Hiroyuki Nakagawa, Yuji Yoshimoto
  • Patent number: 8614862
    Abstract: In one general embodiment, a perpendicular magnetic recording medium includes a ferromagnetic granular layer with perpendicular magnetic anisotropy and having a granular structure; and a cap layer above said granular layer, the cap layer being a ferromagnetic continuous layer with perpendicular magnetic anisotropy, wherein, near a first side of said granular layer nearest the cap layer. Surfaces of the ferromagnetic grains of said granular layer facing the cap layer each have a domed shape defining undulations along the first side. Indentations in said ferromagnetic grains are filled by the oxide of the grain boundary in a vicinity of the first side of said granular layer. Undulations on a granular layer side of said cap layer are flatter than the undulations of the ferromagnetic grains on the first side of said granular layer.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: December 24, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Masayoshi Shimizu, Hiroyuki Nakagawa, Shun Tonooka, Yoshinori Honda