Patents by Inventor Yukio Matsuo

Yukio Matsuo 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).

  • Process for production of grain oriented electrical steel sheet having excellent magnetic properties
    Patent number: 5512110
    Abstract: In the present invention, grain oriented electrical steel sheets provided by heating a slab comprising, by weight percent, 0.025 to 0.075% of C, 3.4 to 5.0% of Si, 0.015 to 0.080% of sol. Al, 0.0030 to 0.013% of N, 0.014% or less of (S+0.405 Se) and 0.05 to 0.8% of Mn, sol. Al (%)/Si (%) being 0.0080 or more, the balance consisting of Fe and unavoidable impurities at a temperature below 1280.degree. C., hot-rolling the heated slab, subjecting the hot-rolled steel sheet to cold rolling, subjecting the cold-rolled steel sheet to decarbonization annealing with regulating the average diameter of primary recrystallized grains of the steel sheet subjected to decarbonization annealing to 18 to 35 .mu.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: April 30, 1996
    Assignee: Nippon Steel Corporation
    Inventors: Yasunari Yoshitomi, Katsuro Kuroki, Yukio Matsuo, Hiroaki Masui, Yoshio Nakamura, Maremizu Ishibashi, Tsuyoshi Kawano, Tsutomu Haratani, Yoshiyuki Ushigami