Patents by Inventor Yozo Ogawa

Yozo Ogawa 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).

  • Dual phase-structured hot rolled high-tensile strength steel sheet and a method of producing the same
    Patent number: 4561910
    Abstract: A dual phase-structured hot rolled steel sheet having a composition consisting of 0.03-0.15% by weight of C. 0.6-1.8% by weight of Mn, 0.04-0.2% by weight of P, not more than 0.10% of Al, not more than 0.008% by weight of S, and the remainder being substantially Fe, and having a microstructure consisting of ferrite and martensite dispersed therein, the area fraction of said ferrite being at least 70% and that of said martensite being at least 5% at the section of the steel sheet, has a high tensile strength and a low yield ratio of not higher than 70%, and has excellent formability. The steel sheet can be produced in a simple manner by cooling directly a hot rolled sheet at an ordinary cooling rate without the use of a particular cooling pattern.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: December 31, 1985
    Assignee: Kawasaki Steel Corporation
    Inventors: Toshiyuki Kato, Isao Takahashi, Toshio Irie, Yozo Ogawa