Patents by Inventor Fumikazu Andou

Fumikazu Andou 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).

  • Grain-oriented electrical steel sheet and method for producing grain-oriented electrical steel sheet
    Patent number: 11072861
    Abstract: A grain-oriented electrical steel sheet according to one embodiment of the present invention includes a steel sheet and an insulation coating, in which the insulation coating contains a first metal phosphate, which is a metal phosphate of one or two more metals selected from Al, Fe, Mg, Mn, Ni, and Zn; a second metal phosphate, which is a metal phosphate of one or two more metals selected from Co, Mo, V, W, and Zr; and colloidal silica, the insulation coating does not contain chromate, and an elution amount of phosphoric acid of the insulation coating as determined by boiling the grain-oriented electrical steel sheet in a boiled pure water for 10 minutes, then measuring an elution amount of phosphoric acid into the pure water, and dividing the amount of phosphoric acid by the area of the insulation coating of the boiled grain-oriented electrical steel sheet is 30 mg/m2 or less.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: July 27, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi Takeda, Fumikazu Andou, Tomoya Suenaga, Shuichi Yamazaki, Masaru Takahashi
  • GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
    Publication number: 20190186018
    Abstract: A grain-oriented electrical steel sheet according to one embodiment of the present invention includes a steel sheet and an insulation coating, in which the insulation coating contains a first metal phosphate, which is a metal phosphate of one or two more metals selected from Al, Fe, Mg, Mn, Ni, and Zn; a second metal phosphate, which is a metal phosphate of one or two more metals selected from Co, Mo, V, W, and Zr; and colloidal silica, the insulation coating does not contain chromate, and an elution amount of phosphoric acid of the insulation coating as determined by boiling the grain-oriented electrical steel sheet in a boiled pure water for 10 minutes, then measuring an elution amount of phosphoric acid into the pure water, and dividing the amount of phosphoric acid by the area of the insulation coating of the boiled grain-oriented electrical steel sheet is 30 mg/m2 or less.
    Type: Application
    Filed: September 28, 2016
    Publication date: June 20, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kazutoshi TAKEDA, Fumikazu ANDOU, Tomoya SUENAGA, Shuichi YAMAZAKI, Masaru TAKAHASHI
  • Grain-oriented electrical steel sheet having high tensile strength insulating film and method of treatment of such insulating film
    Patent number: 7998284
    Abstract: Grain-oriented electrical steel sheet having a chrome-free high tensile strength insulating film characterized by comprising steel sheet on the surface of which is formed an insulating film containing a phosphate and colloidal silica as main ingredients and containing crystalline magnesium phosphate uniformly dispersed over the entire surface.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: August 16, 2011
    Assignee: Nippon Steel Corporation
    Inventors: Kazutoshi Takeda, Fumiaki Takahashi, Shuichi Yamazaki, Hiroyasu Fujii, Fumikazu Andou
  • Grain-Oriented Electrical Steel Sheet Having High Tensile Strength Insulating Film and Method of Treatment of Such Insulating Film
    Publication number: 20090233114
    Abstract: Grain-oriented electrical steel sheet having a chrome-free high tensile strength insulating film characterized by comprising steel sheet on the surface of which is formed an insulating film containing a phosphate and colloidal silica as main ingredients and containing crystalline magnesium phosphate uniformly dispersed over the entire surface.
    Type: Application
    Filed: May 18, 2007
    Publication date: September 17, 2009
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi Takeda, Fumiaki Takahashi, Shuichi Yamazaki, Hiroyasu Fujii, Fumikazu Andou