Patents by Inventor Hidetoshi Kuroki

Hidetoshi Kuroki 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: 20090068052
    Abstract: The invention is of a heat resisting martensitic steel comprising, by weight, 0.05 to 0.30% C, not more than 0.50% Si, not more than 0.60% Mn, 8.0 to 13.0% Cr, 0.5 to 3.0% Ni, 1.0 to 3.0% Mo, 0.1 to 1.5% W, 0.5 to 4% Co, 0.05 to 0.35% V, 0.02 to 0.30% in total of one or two elements selected from the group consisting of Nb and Ta, and 0.02 to 0.10% N, wherein a value of the square of a difference between the Ni amount and the Co amount, and the Ni amount are not more than values determined by a straight line drawn on a point A (1.0, 2.7%) and a point B (2.5, 1.0%) in the orthogonal coordinates shown in the attached drawing of FIG. 2 which represents a relationship between the above square value and the Ni amount, and an amount ratio of Mo/(Mo+0.5W) is not less than 0.5. The heat resisting steel is suitably used in various components of a gas turbine.
    Type: Application
    Filed: May 21, 2008
    Publication date: March 12, 2009
    Applicant: HITACHI, LTD.
    Inventors: Masahiko Arai, Hirotsugu Kawanaka, Hiroyuki Doi, Isao Takehara, Hidetoshi Kuroki
  • Patent number: 7452181
    Abstract: A plant facility in which lubricant supply equipment for supplying a lubricant to rotor bearings and a speed reducer can be dispensed with. The plant facility comprises a gas turbine rotor of a gas turbine that serves as a prime mover driven by expansion work of a working fluid, a generator rotor of a power generator that serves as load equipment rotated by rotational power transmitted from the gas turbine rotor, a plurality of magnetic bearings for supporting the gas turbine rotor and the generator rotor, and an electromagnetic coupling for magnetically coupling the gas turbine rotor and the generator rotor and adjusting a speed reduction ratio between the gas turbine rotor and the generator rotor in accordance with supplied power.
    Type: Grant
    Filed: January 26, 2006
    Date of Patent: November 18, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Hidetoshi Kuroki, Shinya Marushima, Ryo Akiyama
  • Publication number: 20080240924
    Abstract: An airfoil profile is formed such that a passage width ratio, represented in a dimensionless manner, of an inter-blade passage width of vain root cross-section to an outlet throat width substantially monotonously decreases from a blade inlet toward a blade outlet. The blade has a blade airfoil profile shape in an envelope within a range of ±2.0 mm in a direction normal to any surface location of an airfoil profile portion. The airfoil profile portion has a reference airfoil contour represented in Cartesian coordinates wherein Z is a distance representing a sectional height from a root of the airfoil profile portion. The contours represented by X and Y at each section Z are joined smoothly with one another in a blade height direction to form a complete shape of the airfoil profile portion.
    Type: Application
    Filed: January 23, 2008
    Publication date: October 2, 2008
    Inventors: Nobuaki Kizuka, Hidetaro Murata, Hidetoshi Kuroki, Kenji Nanataki
  • Patent number: 7143585
    Abstract: A turbine power plant includes power generation apparatuses divided into a plurality of modules, a common base mounting thereon the power generation apparatuses and a supporting apparatus for supporting the common base. The common base is constructed so as to be commonly used as a part of a transportation vehicle and as a frame of the power plant.
    Type: Grant
    Filed: July 20, 2004
    Date of Patent: December 5, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Hidetoshi Kuroki, Isao Takehara, Yasuyuki Watanabe, Seisaku Takihana
  • Publication number: 20060239820
    Abstract: Provided is a member having an internal cooling passage 7c formed therein and having opposed partition walls 6b, 6c between which a medium flows to cool a parent material, including a first heat transfer rib 25a which extends from almost the center between the opposed partition walls 6b, 6c to one partition wall 6c and slants in a downstream direction of the medium, and a second heat transfer rib 25b which extends from almost the center between the opposed partition walls 6b, 6c to the other partition wall 6b and slants in the downstream direction of the medium, wherein a slit 70a or 70b which passes through between an upstream side of the cooling passage 7c and a downstream side thereof is formed in the first heat transfer rib 70a or the second heat transfer rib 70b.
    Type: Application
    Filed: April 3, 2006
    Publication date: October 26, 2006
    Inventors: Nobuaki Kizuka, Yasuhiro Horiuchi, Shinya Marushima, Hidetoshi Kuroki
  • Publication number: 20060197345
    Abstract: A plant facility in which lubricant supply equipment for supplying a lubricant to rotor bearings and a speed reducer can be dispensed with. The plant facility comprises a gas turbine rotor of a gas turbine that serves as a prime mover driven by expansion work of a working fluid, a generator rotor of a power generator that serves as load equipment rotated by rotational power transmitted from the gas turbine rotor, a plurality of magnetic bearings for supporting the gas turbine rotor and the generator rotor, and an electromagnetic coupling for magnetically coupling the gas turbine rotor and the generator rotor and adjusting a speed reduction ratio between the gas turbine rotor and the generator rotor in accordance with supplied power.
    Type: Application
    Filed: January 26, 2006
    Publication date: September 7, 2006
    Inventors: Hidetoshi Kuroki, Shinya Marushima, Ryo Akiyama
  • Patent number: 7043924
    Abstract: A turbine power plant includes power generation apparatuses divided into a plurality of modules, a common base mounting thereon the power generation apparatuses and a supporting apparatus for supporting the common base. The common base is constructed so as to be commonly used as a part of a transportation vehicle and as a frame of the power plant.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: May 16, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Hidetoshi Kuroki, Isao Takehara, Yasuyuki Watanabe, Seisaku Takihana
  • Publication number: 20050103017
    Abstract: A turbine power plant includes power generation apparatuses divided into a plurality of modules, a common base mounting thereon the power generation apparatuses and a supporting apparatus for supporting the common base. The common base is constructed so as to be commonly used as a part of a transportation vehicle and as a frame of the power plant.
    Type: Application
    Filed: July 20, 2004
    Publication date: May 19, 2005
    Inventors: Hidetoshi Kuroki, Isao Takehara, Yasuyuki Watanabe, Seisaku Takihana
  • Publication number: 20050074356
    Abstract: The invention is of a heat resisting martensitic steel comprising, by weight, 0.05 to 0.30% C, not more than 0.50% Si, not more than 0.60% Mn, 8.0 to 13.0% Cr, 0.5 to 3.0% Ni, 1.0 to 3.0% Mo, 0.1 to 1.5% W, 0.5 to 4% Co, 0.05 to 0.35% V, 0.02 to 0.30% in total of one or two elements selected from the group consisting of Nb and Ta, and 0.02 to 0.10% N, wherein a value of the square of a difference between the Ni amount and the Co amount, and the Ni amount are not more than values determined by a straight line drawn on a point A (1.0, 2.7%) and a point B (2.5, 1.0%) in the orthogonal coordinates shown in the attached drawing of FIG. 2 which represents a relationship between the above square value and the Ni amount, and an amount ratio of Mo/(Mo+0.5 W) is not less than 0.5. The heat resisting steel is suitably used in various components of a gas turbine.
    Type: Application
    Filed: January 16, 2004
    Publication date: April 7, 2005
    Inventors: Masahiko Arai, Hirotsugu Kawanaka, Hiroyuki Doi, Isao Takehara, Hidetoshi Kuroki
  • Patent number: 6871504
    Abstract: A turbine power plant comprises power generation apparatuses divided a plurality of modules, a common base mounting thereon the power generation apparatuses and a supporting apparatus for supporting the common base, and is characterized by a construction of the common base, constructed so as to be commonly used with a part of a transportation vehicle and a frame of the power plant.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: March 29, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Hidetoshi Kuroki, Isao Takehara, Yasuyuki Watanabe, Seisaku Takihana
  • Publication number: 20040060302
    Abstract: A turbine power plant comprises power generation apparatuses divided a plurality of modules, a common base mounting thereon the power generation apparatuses and a supporting apparatus for supporting the common base, and is characterized by a construction of the common base, constructed so as to be commonly used with a part of a transportation vehicle and a frame of the power plant.
    Type: Application
    Filed: September 30, 2003
    Publication date: April 1, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Hidetoshi Kuroki, Isao Takehara, Yasuyuki Watanabe, Seisaku Takihana
  • Publication number: 20030061819
    Abstract: A turbine power plant comprises power generation apparatuses divided a plurality of modules, a common base mounting thereon the power generation apparatuses and a supporting apparatus for supporting the common base, and is characterized by a construction of the common base, constructed so as to be commonly used with a part of a transportation vehicle and a frame of the power plant.
    Type: Application
    Filed: February 25, 2002
    Publication date: April 3, 2003
    Inventors: Hidetoshi Kuroki, Isao Takehara, Yasuyuki Watanabe, Seisaku Takihana