Patents by Inventor Toshio Iwasaki

Toshio Iwasaki 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 having an excellent hydrogen induced cracking resistance
    Patent number: 4153454
    Abstract: Steel materials having an excellent hydrogen induced cracking resistance when used under atmosphere containing H.sub.2 S, which contain 0.05 to 0.20% of C, 0.01 to 0.50% of Si, 0.60 to 2.00% of Mn, 0.01 to 0.10% of Al, less than 0.0020% of S, Ca of 0.0020% to less than 0.0050%. These steel materials are increased in the tensile strength by additionally containing at least one of Cu, Ni, Cr, B, Mo, Nb, V, Zr and Ti. Furthermore the effect of addition of Ca is stabilized by adding rare-earth elements.
    Type: Grant
    Filed: December 23, 1977
    Date of Patent: May 8, 1979
    Assignee: Kawasaki Steel Corporation
    Inventors: Toshihiko Emi, Osamu Haida, Shinobu Okano, Shuji Watanabe, Akitoshi Fujiwara, Toshiaki Shiraishi, Hiroshi Ooi, Toshio Iwasaki, Noboru Okamoto