Patents by Inventor Katsurou Kuroki

Katsurou 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).

  • Grain oriented silicon steel sheet having low core loss and method of manufacturing same
    Patent number: 5961744
    Abstract: Grain oriented silicon steel sheet on which is formed an insulating coating having a thickness that is not less than 2.5 .mu.m that imparts tension to the steel sheet which does not have an inorganic mineral layer formed during a final annealing step (glass film) and a method of forming on grain oriented silicon steel sheet an insulating coating that is not less than 2.5 .mu.m thick and which imparts tension to the steel sheet which does not have the inorganic mineral layer (glass film) that forms during finish annealing, and a method of forming a tensioning insulating coating on grain oriented silicon steel sheet which has been finish annealed and does not have an inorganic mineral surface layer (glass film), after first forming a layer of SiO.sub.2 not less than 0.001 .mu.m thick on the oriented silicon steel sheet.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: October 5, 1999
    Assignee: Nippon Steel Corporation
    Inventors: Shuichi Yamazaki, Hiroyasu Fujii, Takeo Nagashima, Yoshiyuki Ushigami, Osamu Tanaka, Katsurou Kuroki, Hiroaki Masui