Patents by Inventor Fukuyoshi Yamaguchi

Fukuyoshi Yamaguchi 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).

  • Steel materials for welded structures
    Patent number: 4629504
    Abstract: Production of steel materials which show excellent HAZ qualities when used for welded structures and containC: 0.001 to 0.300%Mn: 0.4 to 2.0%P: 0.025% max.S: 0.025% max.Al: 0.007% max.Ti: 0.003 to 0.050%O: 0.0010 to 0.0100%Balance: iron and unavoidable impurities and containing 0.002 to 0.100% of oxide inclusion having a complex grain phase composed of one or more of Ti oxides such as TiO, Ti.sub.2 O.sub.3 having a particle size of not larger than 10 .mu.m.
    Type: Grant
    Filed: September 26, 1985
    Date of Patent: December 16, 1986
    Assignee: Nippon Steel Corporation
    Inventors: Makoto Koike, Hiroyuki Honma, Shoichi Matsuda, Masana Imagunbai, Masazumi Hirai, Fukuyoshi Yamaguchi