Patents by Inventor Satoru Yusa

Satoru Yusa 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).

  • Aircraft engine shaft comprising a maraging steel having a tensile strength of 2300MPa or more
    Patent number: 9506125
    Abstract: The present invention provides a maraging steel containing: 0.10?C?0.30 mass %, 6.0?Ni?9.4 mass %, 11.0?Co?20.0 mass %, 1.0?Mo?6.0 mass %, 2.0?Cr?6.0 mass %, 0.5?Al?1.3 mass %, and Ti?0.1 mass %, with the balance being Fe and unavoidable impurities, and satisfying 1.00?A?1.08, in which A is 0.95+0.35×[C]?0.0092×[Ni]+0.011×[Co]?0.02×[Cr]?0.001×[Mo], where [C] indicates a content (mass %) of C, [Ni] indicates a content (mass %) of Ni, [Co] indicates a content (mass %) of Co, [Cr] indicates a content (mass %) of Cr, and [Mo] indicates a content (mass %) of Mo, respectively. The maraging steel has a tensile strength of 2,300 MPa or more and is also excellent in the toughness/ductility and fatigue characteristics.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: November 29, 2016
    Assignees: DAIDO STEEL CO., LTD., IHI CORPORATION
    Inventors: Shigeki Ueta, Hiroyuki Takabayashi, Ei Kimura, Yuta Tanaka, Satoshi Takahashi, Isao Nakanowatari, Kota Sasaki, Koshiro Yamane, Satoru Yusa
  • MARAGING STEEL
    Publication number: 20130327446
    Abstract: The present invention provides a maraging steel containing: 0.10?C?0.30 mass %, 6.0?Ni?9.4 mass %, 11.0?Co?20.0 mass %, 1.0?Mo?6.0 mass %, 2.0?Cr?6.0 mass %, 0.5?Al?1.3 mass %, and Ti?0.1 mass %, with the balance being Fe and unavoidable impurities, and satisfying 1.00?A?1.08, in which A is 0.95+0.35×[C]?0.0092×[Ni]+0.011×[Co]?0.02×[Cr]?0.001×[Mo], where [C] indicates a content (mass %) of C, [Ni] indicates a content (mass %) of Ni, [Co] indicates a content (mass %) of Co, [Cr] indicates a content (mass%) of Cr, and [Mo] indicates a content (mass%) of Mo, respectively, The maraging steel has a tensile strength of 2,300 MPa or more and is also excellent in the toughness/ductility and fatigue characteristics.
    Type: Application
    Filed: June 5, 2013
    Publication date: December 12, 2013
    Applicants: IHI CORPORATION, DAIDO STEEL CO., LTD.
    Inventors: Shigeki UETA, Hiroyuki TAKABAYASHI, Ei KIMURA, Yuta TANAKA, Satoshi TAKAHASHI, Isao NAKANOWATARI, Kota SASAKI, Koshiro YAMANE, Satoru YUSA
  • High toughness steel and a method for manufacturing the same
    Patent number: 6348108
    Abstract: Ups and downs having a cycle of not more than 5 &mgr;m and an amplitude of not less than 200 nm are formed in a part of not less than 70% per unit length of a prior-austenite grain boundary which is observed in a linear form when seen from a vertical plane by a series of steps of subjecting a steel in a state of austenite to a deformation in not less than 30% of a total area reduction rate at a temperature region which is lower than recrystallization temperature of austenite, and subsequently cooling a deformed steel without causing neither recrystallization nor phase transformation of a diffusion type.
    Type: Grant
    Filed: March 2, 1999
    Date of Patent: February 19, 2002
    Assignee: National Research Institute for Metals
    Inventors: Satoru Yusa, Kaneaki Tsuzaki, Toshihiko Takahashi