Patents by Inventor Denei Takai

Denei Takai 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).

  • High strength steel plate and method for manufacturing same
    Patent number: 4501626
    Abstract: There are described a high strength steel plate having a low yield ratio and improved strength-elongation balance and stretch flangeability, and a method for producing same, the steel plate containing 0.01-0.2% of C, 0.3-2.5% of Mn and 0.01-1.8% of Si and having a tripple phase of polygonal ferrite, bainite and martensite, the area ratios of the bainite and martensite phases being 4-45% and 1-15%, respectively, and the area ratio of the bainite phase being greater than that of the martensite phase.
    Type: Grant
    Filed: October 15, 1981
    Date of Patent: February 26, 1985
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Masatoshi Sudo, Hiromi Hori, Takafusa Iwai, Akinori Ohtomo, Denei Takai