Patents by Inventor Koujiro Kitahata

Koujiro Kitahata 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).

  • Patent number: 4689198
    Abstract: Disclosed herein is a high strength austenitic stainless steel with excellent corrosion resistance even in oxidative enviroments, and a method for producing such stainless steel, in which the kinds and proportions of the component elements are strictly restricted, especially limiting the contents of C and N to achieve solution strengthening while preventing degradations in corrosion resistance and defects of steel ingots which would be caused if they are added excessively. Besides, V is added under coexistence with Cr and Ni to increase the strength by precipitation of carbides and nitrides of V while preventing production of Cr carbides.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: August 25, 1987
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Kazuo Fujiwara, Yasushi Torii, Koujiro Kitahata, Tsuyoshi Inoue, Tadamasa Yokoyama, deceased