Patents by Inventor Ryouichi Shirai

Ryouichi Shirai 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 of recovering useful materials from spent secondary batteries for electric vehicles
    Patent number: 5795673
    Abstract: A method of recovering useful materials from spent secondary batteries for electric vehicles according to the present invention involves a step of cutting a spent secondary battery for electric vehicles into a cover portion and a housing portion, a step of taking out and separating electrode plates from the housing portion, and a step of crushing the electrode plates and dividing the crushed materials into negative electrode substrate, positive electrode plates including a nickel compound and active materials, and separators through the use of pneumatically separating and sieving.
    Type: Grant
    Filed: September 16, 1996
    Date of Patent: August 18, 1998
    Assignee: Mitsui Mining & Smelting Co., Ltd.
    Inventors: Hiroshi Miyagawa, Ryouichi Shirai
  • Method of recovering useful materials from spent secondary batteries for electric vehicles
    Patent number: 5789095
    Abstract: The method of recovering useful materials from spent secondary batteries for electric vehicles comprises a step of separating spent secondary batteries for electric vehicles into a cover portion and a housing portion, a step of taking out electrode plates to separate them from the housing portion, a step of disassembling electrode plates into positive electrode plates and negative electrode plates, and a step of cutting the pole section so that the positive electrode plates can be separated from the negative electrode plates.
    Type: Grant
    Filed: September 16, 1996
    Date of Patent: August 4, 1998
    Assignee: Mitsui Mining & Smelting Co., Ltd.
    Inventors: Hiroshi Miyagawa, Ryouichi Shirai