Patents by Inventor Hisashi Kabayashi

Hisashi Kabayashi 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 excellent primary film properties
    Patent number: 5565272
    Abstract: A grain oriented silicon steel sheet having excellent primary glass film property and magnetic property, comprising 2.0 to 5.0% by weight of Si, wherein a primary glass film formed during secondary recrystallization annealing is composed mainly of forsterite (Mg.sub.2 SiO.sub.4) and an oxide containing Al, mainly of spinel (MgAl.sub.2 O.sub.4), or Al and Si, mainly of cordierite (MgO.sub.2 Al.sub.4 Si.sub.5 O.sub.18) and/or sapphirine (Mg.sub.4 Al.sub.10 Si.sub.2 O.sub.23), and in an analysis of the surface of the steel sheet by glow discharge optical emission spectrometry analysis (GDS analysis), a peak derived from Al is separated from a peak derived from Mg, and, preferably, the peak derived from Al is separated from the peak derived from Mg and the distance (time) from the surface of the steel sheet at which the peak derived from Al is 1.2 times or more the distance from the surface of the steel sheet at which the peak derived from Mg appears.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: October 15, 1996
    Assignee: Nippon Steel Corporation
    Inventors: Hiroaki Masui, Morio Shiozaki, Nobuyuki Takahashi, Hisashi Kabayashi, Takeo Nagashima, Shuichi Yamazaki, Hiroyasu Fujii