Patents by Inventor Kazuya Tsutsumi

Kazuya Tsutsumi 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).

  • Water jet peening device
    Patent number: 10376942
    Abstract: A water jet peening device includes a sealed vessel provided to cover a surface of a welded portion, and adapted to be in a sealed state where an internal pressure is higher than an outside, a jet nozzle adapted to jet high-pressure water to create a cavitation bubble toward the surface of the welded portion, inside the sealed vessel, and a pressure control hole adapted to be able to adjust the internal pressure of the sealed vessel. The water jet peening device can efficiently reform a tensile residual stress on the surface of the welded portion to a compressive residual stress.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: August 13, 2019
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takaharu Maeguchi, Yuichiro Nomura, Kazuya Tsutsumi, Nobuyuki Hori
  • WATER JET PEENING DEVICE
    Publication number: 20160361746
    Abstract: A water jet peening device includes a sealed vessel provided to cover a surface of a welded portion, and adapted to be in a sealed state where an internal pressure is higher than an outside, a jet nozzle adapted to jet high-pressure water to create a cavitation bubble toward the surface of the welded portion, inside the sealed vessel, and a pressure control hole adapted to be able to adjust the internal pressure of the sealed vessel. The water jet peening device can efficiently reform a tensile residual stress on the surface of the welded portion to a compressive residual stress.
    Type: Application
    Filed: January 16, 2015
    Publication date: December 15, 2016
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takaharu Maeguchi, Yuichiro Nomura, Kazuya Tsutsumi, Nobuyuki Hori
  • Wind turbine and operating method thereof
    Patent number: 8116914
    Abstract: A pitch controller, uninterruptible power supply, and rotational speed detector are disposed in the rotor in a wind turbine. When a slip ring failure or wire breakage occurs, the pitch controller internally creates a pitch angle command so as to control the pitch angle.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: February 14, 2012
    Assignees: Hitachi, Ltd., Fuji Heavy Industries Ltd.
    Inventors: Shinya Oohara, Masaya Ichinose, Motoo Futami, Kazuya Tsutsumi, Takashi Shiraishi, Shigeo Yoshida, Hajime Komiyama, Junichi Sugino
  • WIND TURBINE AND OPERATING METHOD THEREOF
    Publication number: 20080069692
    Abstract: A pitch controller, uninterruptible power supply, and rotational speed detector are disposed in the rotor in a wind turbine. When a slip ring failure or wire breakage occurs, the pitch controller internally creates a pitch angle command so as to control the pitch angle.
    Type: Application
    Filed: August 20, 2007
    Publication date: March 20, 2008
    Inventors: SHINYA OOHARA, Masaya Ichinose, Motoo Futami, Kazuya Tsutsumi, Takashi Shiraishi, Shigeo Yoshida, Hajime Komiyama, Junichi Sugino