Patents by Inventor Yasuhiro Koyakumaru

Yasuhiro Koyakumaru 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).

  • Method for manufacturing a corrosion resistant nickel plating steel sheet or strip
    Patent number: 5679181
    Abstract: According to the present invention, there is provided a method of forming a corrosion-resistant nickel plated steel sheet or strip comprising a base sheet made of a cold rolled steel sheet or strip. A nickel layer is electroplated on at least one side thereof. A part or all of the nickel plated layer forms Fe-Ni diffusion layer. Moreover, the exposure rate of iron on the surface of the nickel plated layer is 4-30%.
    Type: Grant
    Filed: January 25, 1996
    Date of Patent: October 21, 1997
    Assignee: Toyo Kohan Co., Ltd.
    Inventors: Hitoshi Ohmura, Yasuhiro Koyakumaru, Satoshi Iketaka
  • Corrosion resistant nickel plating steel sheet or strip and manufacturing method thereof
    Patent number: 5587248
    Abstract: According to the present invention, there is provided a corrosion-resistant nickel plated steel sheet or strip comprising base sheet made of a cold rolled steel sheet or strip and a nickel layer plated on at least one side thereof; in which a part or all of the nickel plated layer forms Fe-Ni diffusion layer; moreover, exposure rate of iron on a surface of the nickel plated layer is 30% and below.
    Type: Grant
    Filed: March 3, 1995
    Date of Patent: December 24, 1996
    Assignee: Toyo Kohan Co., Ltd.
    Inventors: Hitoshi Ohmura, Yasuhiro Koyakumaru, Satoshi Iketaka