Patents by Inventor Yasuhiro Katoh

Yasuhiro Katoh 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).

  • Patent number: 7040083
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: May 9, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Publication number: 20040255596
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Application
    Filed: July 22, 2004
    Publication date: December 23, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Patent number: 6779332
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: August 24, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Publication number: 20040093850
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and an injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas. to be introduced into the compressor than the atmospheric temperature, and causing water droppers having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Application
    Filed: November 12, 2003
    Publication date: May 20, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Patent number: 6711888
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: March 30, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Patent number: 6705074
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: March 16, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Patent number: 6568167
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: May 27, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Patent number: 6568168
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: May 27, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Patent number: 6530210
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: March 11, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Publication number: 20030019202
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and an injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Application
    Filed: September 17, 2002
    Publication date: January 30, 2003
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Publication number: 20030014978
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and an injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Application
    Filed: September 17, 2002
    Publication date: January 23, 2003
    Inventors: Nobuyuki Horii, lsao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Publication number: 20030014958
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and an injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Application
    Filed: September 17, 2002
    Publication date: January 23, 2003
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Publication number: 20020139105
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and an injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Application
    Filed: May 30, 2002
    Publication date: October 3, 2002
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Publication number: 20010022078
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and an injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Application
    Filed: May 16, 2001
    Publication date: September 20, 2001
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Patent number: 6260350
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: July 17, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Patent number: 5586857
    Abstract: A compressor has inlet guide vanes, rotor blades and stator blades. To prevent rotating stall, baffle vanes 5 capable of having their angles varied are installed upstream of the inlet guide vanes, actuators to vary the angles of baffle vanes are coupled to the baffle vanes, sensors installed upstream of the baffle vanes detect a rotating stall condition inside the flow passage of the compressor, and a control unit is responsive to signals from the sensors to output control signals to the actuators to vary the angles of the baffle vanes so as to prevent the rotating stall condition. Instead of the baffle vanes, fluid jets may be provided upstream of the inlet guide vanes for the same purposes.
    Type: Grant
    Filed: June 30, 1995
    Date of Patent: December 24, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Ishii, Tetsuo Sasada, Masayuki Kasahara, Yasuhiro Katoh, Yasushige Kashiwabara
  • Patent number: 5554000
    Abstract: An axial flow compressor for use in a gas turbine or other industrial application having an improved efficiency is provided through modification of the blade shape and profile of the blades subject to a subsonic high velocity inlet flow so as to avoid shock losses in the blade rows, and improve the total efficiency. The curvature distribution on the suction surface of the stator blade rows or rotor blade rows of the axial flow compressor is adapted to have a local minimum in a region toward the leading edge of the blade, and then a local maximum. Thereby, an excessive increment in velocity on the suction surface from the leading edge to the position of the maximum velocity can be suppressed, and the occurrence of a shock wave can be avoided so as to minimize pressure loss in the blade rows, thus increasing the total efficiency of the axial compressor.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: September 10, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Yasuhiro Katoh, Yoshihiro Tsuda, Mitsuaki Yanagida, Hajime Toriya, Tetsuo Sasada
  • Patent number: 5352489
    Abstract: A method for manufacturing a rotary anode for use in an X-ray tube is proposed. The method has the step of forming, on a graphite substrate plate, an intermediate layer of rhenium by subjecting a metallic chloride to the thermal decomposition CVD process at a substrate temperature of 1200.degree. C. or more. The method further has the step of forming, on the intermediate layer, an X-ray generating layer of tungsten or tungsten-rhenium alloy by subjecting a metallic fluoride to the hydrogen reduction thermal CVD process.
    Type: Grant
    Filed: August 10, 1993
    Date of Patent: October 4, 1994
    Assignees: Tokyo Tungsten Co., Ltd, Sumitomo Electric Industries, Ltd.
    Inventors: Hisanori Ohara, Hiromu Kawai, Shigehiko Takaoka, Yasuhiro Katoh
  • Patent number: RE38831
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: November 18, 2004
    Date of Patent: October 18, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh
  • Patent number: RE39092
    Abstract: A gas turbine comprises a compressor for compressing a gas supplied therein and discharging the compressed gas, a combustor in which the discharged gas from the compressor and a fuel are combusted, a turbine to be driven by a combustion gas from the combustor, and a water injection unit which injects water into the gas to be supplied to the compressor, thereby lowering the temperature of the gas to be introduced into the compressor to a temperature lower than the atmospheric temperature, and causing water droplets having been injected in the gas and within the compressor to be vaporized while flowing down therein, wherein the quantity of water spray injection is controlled while monitoring operational conditions of the gas turbine.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: May 9, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyuki Horii, Isao Takehara, Hidetaro Murata, Motoaki Utamura, Takaaki Kuwahara, Tetsuo Sasada, Fumiyuki Hirose, Yasuhiro Katoh