Patents by Inventor Keisuke Hirano

Keisuke Hirano 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: 20120285674
    Abstract: A thermal conductive sheet contains a resin and a plate-like or flake-like filler. The average orientation angle of the filler is 29 degrees or more and the maximum orientation angle thereof is 65 degrees or more with respect to the plane direction of the thermal conductive sheet.
    Type: Application
    Filed: May 11, 2012
    Publication date: November 15, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventor: Keisuke HIRANO
  • Patent number: 8298456
    Abstract: The present invention relates to a silicone resin composition including a silicone resin and metal oxide fine particles dispersed therein, the silicone resin being obtained by reacting a siloxane derivative having at least one selected from the group consisting of an alkoxysilyl group and a silanol group at a molecular end thereof and having a weight-average molecular weight (Mw) as determined by a gel permeation method of 300 to 6,000, with silica fine particles having silanol groups on a surface thereof.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: October 30, 2012
    Assignee: Nitto Denko Corporation
    Inventor: Keisuke Hirano
  • Publication number: 20120194310
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of densely sintering the entirety of the magnet without making a gap between a main phase and a grain boundary phase in the sintered magnet. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M- (OR)x (M represents V, Mo, Zr, Ta, Ti, W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, a compact body formed through powder compaction is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius. Thereafter, through sintering process, a permanent magnet is manufactured.
    Type: Application
    Filed: March 28, 2011
    Publication date: August 2, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120187326
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of decreasing an activity level of a calcined body activated by a calcination process. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M?(OR)x (M represents Dy or Tb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, desiccated magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius. Thereafter, the powdery calcined body calcined through the calcination process in hydrogen is held for several hours in vacuum atmosphere at 200 through 600 degrees Celsius for a dehydrogenation process.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 26, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Toshinobu Hoshino, Takashi Ozaki
  • Publication number: 20120187329
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of densely sintering the entirety of the magnet without making a gap between a main phase and a grain boundary phase in the sintered magnet. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)X (M represents Dy or Tb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, X represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, a compact body formed by powder compaction is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius for calcination process in hydrogen. Thereafter, through sintering process, the compacted-state calcined body is formed into a permanent magnet.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 26, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Toshinobu Hoshino, Takashi Ozaki
  • Publication number: 20120187612
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of densely sintering the entirety of the magnet without making a gap between a main phase and a grain boundary phase in the sintered magnet. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)X (M represents Dy or Tb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, X represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, desiccated magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius. Thereafter, the powdery calcined body calcined through the calcination process in hydrogen is held for several hours in vacuum atmosphere at 200 through 600 degrees Celsius for a dehydrogenation process.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 26, 2012
    Applicant: Nitto Denko Corporation
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Toshinobu Hoshino, Takashi Ozaki
  • Publication number: 20120187327
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of decreasing an activity level of a calcined body activated by a calcination process. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)x (M represents V, Mo, Zr, Ta, Ti, W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, desiccated magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius. Thereafter, the powdery calcined body calcined through the calcination process in hydrogen is held for several hours in vacuum atmosphere at 200 through 600 degrees Celsius for a dehydrogenation process.
    Type: Application
    Filed: March 31, 2011
    Publication date: July 26, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120187328
    Abstract: There are provided a permanent magnet and a manufacturing method thereof enabling carbon content contained in magnet particles to be reduced in advance before sintering even when wet milling is employed. Coarsely-milled magnet powder is further milled by a bead mill in a solvent together with an organometallic compound expressed with a structural formula of M-(OR)X (M represents V, Mo, Zr, Ta Ti W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, X represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the magnet powder. Thereafter, a compact body of compacted magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius to perform hydrogen calcination process. Thereafter, through sintering process, a permanent magnet 1 is formed.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 26, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120181475
    Abstract: There are provided a permanent magnet and a manufacturing method thereof enabling carbon content contained in magnet particles to be reduced in advance before sintering even when wet milling is employed. Coarsely-milled magnet powder is further milled by a bead mill in a solvent together with an organometallic compound expressed with a structural formula of M?(OR)x (M includes at least one of neodymium, praseodymium, dysprosium and terbium, each being a rare earth element, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the magnet powder. Thereafter, a compact body of compacted magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius to perform hydrogen calcination process. Thereafter, through sintering process, a permanent magnet 1 is manufactured.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 19, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120182107
    Abstract: There are provided a permanent magnet and a manufacturing method thereof that enables concentration of V, Mo, Zr, Ta, Ti, W or Nb contained in an organometallic compound in grain boundaries of the permanent magnet. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)x (M represents V, Mo, Zr, Ta, Ti, W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, a compact body obtained by compacting the magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius so as to perform a calcination process in hydrogen. Thereafter, through sintering, a permanent magnet is manufactured.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 19, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120182106
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of preventing grain growth in a main phase and enabling rare-earth rich phase to be uniformly dispersed. To fine powder of milled neodymium magnet material is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)x (in the formula, M represents Cu or Al, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, a compact body formed by compacting the above neodymium magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius. Thereafter, through a sintering process, a permanent magnet is manufactured.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 19, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120182105
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of preventing degrade in the magnetic properties by densely sintering the entirety of the magnet. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)X (M represents Dy or Tb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, X represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, the desiccated magnet powder is calcined by utilizing plasma heating and the powdery calcined body is sintered so as to form a permanent magnet 1.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 19, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120182109
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of inhibiting grain growth of magnet grains having single domain particle size during sintering so as to improve magnetic properties. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)x (M represents V, Mo, Zr, Ta, Ti, W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, the desiccated magnet powder is calcined by utilizing plasma heating and the powdery calcined body is sintered so as to form a permanent magnet 1.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 19, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120182104
    Abstract: There are provided a permanent magnet and a manufacturing method thereof enabling carbon content contained in magnet particles to be reduced in advance before sintering even when wet milling is employed, and also the entirety of the magnet to be densely sintered without making a gap between a main phase and a grain boundary phase in the sintered magnet. Coarsely-milled magnet powder is further milled by a bead mill in an organic solvent. Thereafter, a compact body of compacted magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius to perform hydrogen calcination process. Thereafter, through sintering process, a permanent magnet 1 is formed.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 19, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120182108
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of densely sintering the entirety of the magnet without making a gap between a main phase and a grain boundary phase in the sintered magnet. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)x (M represents V, Mo, Zr, Ta, Ti, W or Nb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, desiccated magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius. Thereafter, the powdery calcined body calcined through the calcination process in hydrogen is held for several hours in vacuum atmosphere at 200 through 600 degrees Celsius for a dehydrogenation process.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 19, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Takashi Ozaki
  • Publication number: 20120181476
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of efficiently concentrating traces of Dy or Tb in grain boundaries of the magnet and sufficiently improving coercive force due to Dy or Tb while reducing amount of Dy or Tb to be used. To fine powder of milled neodymium magnet material is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M-(OR)x (M represents Dy or Tb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, a compact body compacted through powder compaction is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius for a hydrogen calcination process. Thereafter, through sintering process, the compact body is formed into a permanent magnet.
    Type: Application
    Filed: March 28, 2011
    Publication date: July 19, 2012
    Applicant: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Toshinobu Hoshino, Takashi Ozaki
  • Patent number: 8222352
    Abstract: A composition for a silicone resin containing a poly(methyl silsesquioxane) derivative having an alkoxysilyl group at an end of a molecule, and fine metal oxide particles having a reactive functional group on the surface thereof, wherein the composition further contains at least one compound selected from the group consisting of disilanol derivatives having silanol groups at both ends of a molecule and a monofunctional silane derivative represented by the formula (II): wherein X is an alkoxy group or a halogen atom. The silicone resin composition of the present invention can be suitably used as, for example, materials for encapsulating photosemiconductor elements for use in backlights for liquid crystal displays, traffic lights, outdoor big displays, advertisement sign boards, and the like.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: July 17, 2012
    Assignee: Nitto Denko Corporation
    Inventor: Keisuke Hirano
  • Patent number: 8173743
    Abstract: A silicone resin composition obtainable by reacting a bifunctional alkoxysilane and a trifunctional alkoxysilane in the presence of a dispersion of fine metal oxide particles. The silicone resin composition is suitably used in backlights for liquid crystal displays, traffic lights, outdoor big displays, advertisement sign boards, and the like.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: May 8, 2012
    Assignee: Nitto Denko Corporation
    Inventor: Keisuke Hirano
  • Publication number: 20110217542
    Abstract: There are provided a pressure-sensitive adhesive composition containing stably dispersed metal-based fine particles, having further reinforced mechanical properties, and being capable of forming a pressure-sensitive adhesive layer with excellent refractive index and excellent adhesive strength, and a pressure-sensitive adhesive sheet produced therewith.
    Type: Application
    Filed: August 4, 2009
    Publication date: September 8, 2011
    Applicant: Nitto Denko Corporation
    Inventors: Yutaka Moroishi, Keisuke Hirano, Fumiko Nakano, Akiko Tanaka
  • Publication number: 20110186792
    Abstract: The present invention relates to a silicone resin composition including a silicone resin and metal oxide fine particles dispersed therein, the silicone resin being obtained by reacting a siloxane derivative having at least one selected from the group consisting of an alkoxysilyl group and a silanol group at a molecular end thereof and having a weight-average molecular weight (Mw) as determined by a gel permeation method of 300 to 6,000, with silica fine particles having silanol groups on a surface thereof.
    Type: Application
    Filed: January 31, 2011
    Publication date: August 4, 2011
    Applicant: NITTO DENKO CORPORATION
    Inventor: Keisuke HIRANO