Patents by Inventor Youichi Amako

Youichi Amako 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).

  • Gas insulation transformer
    Patent number: 6859124
    Abstract: A gas insulation transformer, in the tank of which transformer an apparatus including an iron core and a coil is received and a gas is filled as an insulating and cooling medium, is provided, wherein the iron core and coil are possessed with the loss characteristics equivalent to that of a high-efficient transformer and an inert gas, the global warming coefficient of which gas is rated 1 or below, is filled in the tank as an insulating and cooling medium.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: February 22, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Akira Nishimizu, Youichi Amako, Takahide Matsuo, Noriyuki Hayashi, Takashi Shirone
  • Method of fabricating a core for a transformer
    Patent number: 6769169
    Abstract: To provide a technology capable of restraining direct current magnetic deviation in a transformer without providing a gap in a core, an axis of easy magnetization is provided in a second direction intersecting with a first direction along a magnetic circuit of the core to thereby bring a B-H characteristic of a material characteristic of the core into an unsaturated state.
    Type: Grant
    Filed: February 7, 2003
    Date of Patent: August 3, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Akira Nishimizu, Hideki Masuhara, Youichi Amako, Masanao Kuwabara
  • Transformer
    Patent number: 6611191
    Abstract: To provide a technology capable of restraining direct current magnetic deviation in a transformer without providing a gap in a core, an axis of easy magnetization is provided in a second direction intersecting with a first direction along a magnetic circuit of the core to thereby bring a B-H characteristic of a material characteristic of the core into an unsaturated state.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: August 26, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Akira Nishimizu, Hideki Masuhara, Youichi Amako, Masanao Kuwabara
  • Method of fabricating a core for a transformer
    Publication number: 20030137386
    Abstract: To provide a technology capable of restraining direct current magnetic deviation in a transformer without providing a gap in a core, an axis of easy magnetization is provided in a second direction intersecting with a first direction along a magnetic circuit of the core to thereby bring a B-H characteristic of a material characteristic of the core into an unsaturated state.
    Type: Application
    Filed: February 7, 2003
    Publication date: July 24, 2003
    Inventors: Akira Nishimizu, Hideki Masuhara, Youichi Amako, Masanao Kuwabara
  • Gas insulation transformer
    Publication number: 20030080841
    Abstract: A gas insulation transformer, in the tank of which transformer an apparatus including an iron core and a coil is received and a gas is filled as an insulating and cooling medium, is provided, wherein the iron core and coil are possessed with the loss characteristics equivalent to that of a high-efficient transformer and an inert gas, the global warming coefficient of which gas is rated 1 or below, is filled in the tank as an insulating and cooling medium.
    Type: Application
    Filed: January 31, 2002
    Publication date: May 1, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Akira Nishimizu, Youichi Amako, Takahide Matsuo, Noriyuki Hayashi, Takashi Shirone
  • Transformer
    Publication number: 20020101321
    Abstract: To provide a technology capable of restraining direct current magnetic deviation in a transformer without providing a gap in a core, an axis of easy magnetization is provided in a second direction intersecting with a first direction along a magnetic circuit of the core to thereby bring a B-H characteristic of a material characteristic of the core into an unsaturated state.
    Type: Application
    Filed: July 20, 2001
    Publication date: August 1, 2002
    Inventors: Akira Nishimizu, Hideki Masuhara, Youichi Amako, Masanao Kuwabara