Patents by Inventor Iwaki HIROOKA

Iwaki HIROOKA 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).

  • Grease composition
    Patent number: 11162051
    Abstract: The present invention provides a grease composition comprising (a) a base oil, (b) a thickener comprising a urea compound, (c) an amine antioxidant at 0.5 to 5% by mass based on a total mass of the composition, and (d) a quinoline antioxidant at 0.5 to 5% by mass based on the total mass of the composition.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: November 2, 2021
    Assignee: KYODO YUSHI CO., LTD.
    Inventors: Iwaki Hirooka, Yuta Sato, Masatoshi Ijima
  • Grease composition
    Patent number: 11155766
    Abstract: A grease composition comprises a thickener, a base oil, and a friction modifier. The friction modifier comprises: at least one selected from the group consisting of fatty acids, fatty acid metal salts, phosphate esters, thiophosphate esters, and zinc dithiophosphates; and a polyhydric alcohol ester.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: October 26, 2021
    Assignee: KYODO YUSHI CO., LTD.
    Inventors: Ryosuke Saito, Yuta Sato, Iwaki Hirooka
  • Grease composition for lubricating resins and electric power steering device
    Patent number: 10920163
    Abstract: The invention provides a grease composition for lubricating resins which contains a base oil, a diurea compound represented by formula (I) as a thickener: R1—NHCONH—R2—NHCONH—R3 (I) (wherein R2 represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 each independently represent a straight-chain or branched alkyl group having 8 to 22 carbon atoms), and a chained hydrocarbon polymer having a weight-average molecular weight of 20,000 to 300,000.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: February 16, 2021
    Assignees: KYODO YUSHI CO., LTD., NSK LTD.
    Inventors: Iwaki Hirooka, Haruhiko Kiyota, Takeshi Yamamoto, Michita Hokao
  • Grease composition
    Patent number: 10844309
    Abstract: Provided is a grease composition for a magnet clutch of an automobile, including: a base oil; and a thickener, wherein the composition contains 5% by mass or more of a sulfur content in terms of sulfur element relative to a total mass of the composition.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: November 24, 2020
    Assignees: KYODO YUSHI CO., LTD., DENSO CORPORATION
    Inventors: Shozo Ikejima, Iwaki Hirooka, Yutaka Imai, Ryosuke Ichimura, Kazuki Isa, Yusuke Asada, Kyoji Inukai, Hiromasa Tanaka, Masashi Tobayama, Toshizo Watanabe
  • GREASE COMPOSITION
    Publication number: 20190185780
    Abstract: A grease composition comprises a thickener, a base oil, and a friction modifier. The friction modifier comprises: at least one selected from the group consisting of fatty acids, fatty acid metal salts, phosphate esters, thiophosphate esters, and zinc dithiophosphates; and a polyhydric alcohol ester.
    Type: Application
    Filed: July 26, 2017
    Publication date: June 20, 2019
    Applicant: KYODO YUSHI CO., LTD.
    Inventors: Ryosuke SAITO, Yuta SATO, Iwaki HIROOKA
  • GREASE COMPOSITION
    Publication number: 20190177645
    Abstract: The present invention provides a grease composition comprising (a) a base oil, (b) a thickener comprising a urea compound, (c) an amine antioxidant at 0.5 to 5% by mass based on a total mass of the composition, and (d) a quinoline antioxidant at 0.5 to 5% by mass based on the total mass of the composition.
    Type: Application
    Filed: August 4, 2017
    Publication date: June 13, 2019
    Applicant: KYODO YUSHI CO., LTD.
    Inventors: Iwaki HIROOKA, Yuta SATO, Masatoshi IJIMA
  • Lubricating oil for fluid dynamic bearing and spindle motor equipped with the lubricating oil
    Patent number: 10280382
    Abstract: The invention provides a lubricating oil for fluid dynamic bearing including as a base oil a monoester oil free of unsaturated bond, and having an absolute viscosity of 2.0 to 3.0 mPa·s at 100° C. a viscosity index of 130 or more and a pour point of ?20° C. or less.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: May 7, 2019
    Assignees: KYODO YUSHI CO., LTD., NIDEC CORPORATION
    Inventors: Iwaki Hirooka, Takayuki Oe, Sayuri Tsubata, Yuji Hagiwara
  • GREASE COMPOSITION
    Publication number: 20190062664
    Abstract: Provided is a grease composition for a magnet clutch of an automobile, including: a base oil; and a thickener, wherein the composition contains 5% by mass or more of a sulfur content in terms of sulfur element relative to a total mass of the composition.
    Type: Application
    Filed: July 5, 2018
    Publication date: February 28, 2019
    Applicants: Kyodo Yushi Co., Ltd., Denso Corporation
    Inventors: Shozo Ikejima, Iwaki Hirooka, Yutaka Imai, Ryosuke Ichimura, Kazuki Isa, Yusuke Asada, Kyoji Inukai, Hiromasa Tanaka, Masashi Tobayama, Toshizo Watanabe
  • Grease composition
    Patent number: 10077411
    Abstract: The invention provides a grease composition containing a base oil, a thickener, and an anti-flaking additive such as a compound represented by, for example, formula (1-1), which grease composition can prevent the white layer flaking of the rolling bearings. (In the formula, R1 and R4 are each independently a straight-chain or branched alkyl or alkenyl group having 1 to 20 carbon atoms.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: September 18, 2018
    Assignees: KYODO YUSHI CO., LTD., DENSO CORPORATION
    Inventors: Terasu Yoshinari, Tomonobu Komoriya, Iwaki Hirooka, Masataka Muto, Satoru Nakazawa, Yoshinori Fukushima, Shigeyuki Mori
  • GREASE COMPOSITION FOR LUBRICATING RESINS AND ELECTRIC POWER STEERING DEVICE
    Publication number: 20170362530
    Abstract: The invention provides a grease composition for lubricating resins which contains a base oil, a diurea compound represented by formula (I) as a thickener: R1—NHCONH —R2—NHCONH—R3 (I) (wherein R2 represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 each independently represent a straight-chain or branched alkyl group having 8 to 22 carbon atoms), and a chained hydrocarbon polymer having a weight-average molecular weight of 20,000 to 300,000.
    Type: Application
    Filed: December 28, 2015
    Publication date: December 21, 2017
    Applicants: KYODO YUSHI CO., LTD., NSK Ltd.
    Inventors: Iwaki HIROOKA, Haruhiko KIYOTA, Takeshi YAMAMOTO, Michita HOKAO
  • SILICONE GREASE COMPOSITION
    Publication number: 20170002285
    Abstract: The invention provides a silicone grease composition where the high friction properties are improved, with no decrease of the wear preventive characteristics. The silicone grease composition contains a thickener, a base oil containing a silicone oil in an amount of 50 mass % or more of the total mass of the base oil, and a metallic oxide with a Mohs hardness of 6 or less as a friction modifier.
    Type: Application
    Filed: February 18, 2015
    Publication date: January 5, 2017
    Applicant: KYODO YUSHI CO., LTD.
    Inventors: Iwaki HIROOKA, Terasu YOSHINARI
  • LUBRICATING OIL FOR FLUID DYNAMIC BEARING AND SPINDLE MOTOR EQUIPPED WITH THE LUBRICATING OIL
    Publication number: 20160319215
    Abstract: The invention provides a lubricating oil for fluid dynamic bearing including as a base oil a monoester oil free of unsaturated bond, and having an absolute viscosity of 2.0 to 3.0 mPa·s at 100° C. a viscosity index of 130 or more and a pour point of ?20° C. or less.
    Type: Application
    Filed: April 28, 2016
    Publication date: November 3, 2016
    Inventors: Iwaki HIROOKA, Takayuki OE, Sayuri TSUBATA, Yuji HAGIWARA
  • GREASE COMPOSITION
    Publication number: 20160177213
    Abstract: The invention provides a grease composition containing a base oil, a thickener, and an anti-flaking additive such as a compound represented by, for example, formula (1-1), which grease composition can prevent the white layer flaking of the rolling bearings. (In the formula, R1 and R4 are each independently a straight-chain or branched alkyl or alkenyl group having 1 to 20 carbon atoms.
    Type: Application
    Filed: August 4, 2014
    Publication date: June 23, 2016
    Applicants: KYODO YUSHI CO., LTD., DENSO CORPORATION
    Inventors: Terasu YOSHINARI, Tomonobu KOMORIYA, Iwaki HIROOKA, Masataka MUTO, Satoru NAKAZAWA, Yoshinori FUKUSHIMA, Shigeyuki MORI
  • Grease composition comprising polymer alloy, a structure part enclosing the same and a method for producing the grease composition
    Patent number: 8975218
    Abstract: A grease composition having a thickener, a base oil containing a hydrocarbon oil, and a polymer alloy of an olefin copolymer and a styrene-based copolymer is disclosed.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: March 10, 2015
    Assignee: Kyodo Yushi Co., Ltd.
    Inventors: Kyosuke Ikuma, Yosuke Takao, Takashi Takizawa, Iwaki Hirooka, Yosuke Endo, Akihiko Urashima
  • GREASE COMPOSITION COMPRISING POLYMER ALLOY, A STRUCTURE PART ENCLOSING THE SAME AND A METHOD FOR PRODUCING THE GREASE COMPOSITION
    Publication number: 20120214721
    Abstract: A grease composition having a thickener, a base oil containing a hydrocarbon oil, and a polymer alloy of an olefin copolymer and a styrene-based copolymer is disclosed.
    Type: Application
    Filed: February 3, 2012
    Publication date: August 23, 2012
    Applicant: KYODO YUSHI CO., LTD.
    Inventors: Kyosuke IKUMA, Yosuke TAKAO, Takashi TAKIZAWA, Iwaki HIROOKA, Yosuke ENDO, Akihiko URASHIMA