Patents by Inventor Shigekazu Ooba

Shigekazu Ooba 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).

  • Zinc-based metal plated steel sheet treated with phosphate being excellent in formability and method for production thereof
    Patent number: 6753095
    Abstract: The aim of the present invention is to provide a phosphate treated zinc coated steel sheet with excellent workability. A steel sheet coated with a zinc based alloy has a phosphate treated coating on the surface thereof. The phosphate treated coating comprises mainly granulated crystals, specifically, crystals in which the average ratio of the major axis to the minor axis is not less than 1.00 and not more than 2.90. Moreover, the method for producing the phosphate treated coating uses a phosphate treatment solution in which the amount of Mg ions is ≧6 g/l and the amount of Zn ions is ≧0.5 g/l, or a phosphate treatment solution in which the amount of Mg ions is ≧10 g/l, the amount of Zn ions is 0≦ and <0.5 g/l, and the amount of nitric acid ions is ≧40 g/l.
    Type: Grant
    Filed: February 11, 2002
    Date of Patent: June 22, 2004
    Assignee: Nippon Steel Corporation
    Inventors: Hidetoshi Shindou, Kiyokazu Isizuka, Keiichi Sanada, Kazuo Takahashi, Teruaki Yamada, Daisuke Ito, Shigekazu Ooba