Patents by Inventor Takeshi Moncho

Takeshi Moncho 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).

  • Welded high-strength steel structures and method of manufacturing the same
    Patent number: 6188037
    Abstract: The present invention is a welded high-strength steel structure having a TS of not less than 900 MPa and excellent low-temperature toughness and a method of manufacturing the steel structure. The base steel is formed of a mixed structure of martensite and lower bainite and has a TS of not less than 900 MPa, and the weld metal is steel which has the following elements based on % by weight: C: 0.01% to 0.15%; Si: 0.02% to 0.6%; Mn: 0.6% to 3%; Al: 0.004% to 0.08%; Ti: 0.003% to 0.03%; O (oxygen): not greater than 0.06%; B: 0.0002% to 0.00%; and as optional components, Cu, Ni, Cr, Mo, V, and Nb and which satisfies the following two equations: 0.25 ≦ Pcm ≦ 0.32 and 0.6 ≦ Al/O (oxygen) ≦ 1.4.
    Type: Grant
    Filed: March 18, 1998
    Date of Patent: February 13, 2001
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Masahiko Hamada, Yu-ichi Komizo, Takeshi Moncho