Patents by Inventor Natsuko Hashimoto

Natsuko Hashimoto 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).

  • Cold rolled steel sheet and galvanized steel sheet having improved homogeneity in workability and process for producing same
    Patent number: 5954896
    Abstract: According to the present invention, an ultra low carbon steel with Nb, Ti, or Nb-Ti added thereto is used as a material, and (% S as MnS)/(total S content) is regulated to not more than 0.2 with (% C as carbosulfide)/(total C content) being regulating to not more than 0.7, thereby efficiently precipitating carbosulfide in a .gamma. temperature region during hot rolling and thus reducing the amount of C in solid solution to ensure the homogeneity of the material over the whole length of a coil and to markedly improve the workability.
    Type: Grant
    Filed: October 18, 1996
    Date of Patent: September 21, 1999
    Assignee: Nippon Steel Corporation
    Inventors: Kazuo Koyama, Masayoshi Suehiro, Naoki Yoshinaga, Natsuko Hashimoto