Patents by Inventor Muneyoshi Takeyama

Muneyoshi Takeyama 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).

  • Method for producing steel plate having excellent resistance to hydrogen induced cracking
    Patent number: 4325748
    Abstract: Steel plate having an excellent resistance to hydrogen induced cracking is obtained from a continuously cast slab having the following composition, C 0.01-0.30% by weight, Si 0.05-0.60% by weight, Mn 0.40-2.50% by weight, Sol Al 0.005-1.00% by weight, S 0.003% and lower by weight, the weight ratio of Ca/S is 2-10, the remainder being substantially Fe, through the steps of hot primary reduction rolling the cast slab, heating it at the temperature of 1200.degree. C. or higher for 10 hours or longer, and ordinary rolling it.
    Type: Grant
    Filed: March 27, 1980
    Date of Patent: April 20, 1982
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Hajime Nashiwa, Toshihiko Kawai, Muneyoshi Takeyama, Youzi Yamaguchi, Tsuneaki Kobayashi, Tsutomu Nagahata