Patents by Inventor Yasuko Kojima

Yasuko Kojima 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).

  • Lithium Extraction Method, and Metal Recovery Method
    Publication number: 20130206607
    Abstract: To provided a method for recovering lithium from a lithium ion battery using comparatively simple equipment and without using a cumbersome process. A lithium extraction method for extracting lithium from the positive electrode material of a lithium ion battery containing lithium and cobalt, the method being characterized in that the positive electrode material is immersed into an acidic solution at 50° C. or less, lithium ions are selectively leached into the acidic solution while inhibiting the leaching of cobalt ions, and the leaching of lithium ions is stopped while the amount of lithium contained in the positive electrode material is sufficient.
    Type: Application
    Filed: July 13, 2011
    Publication date: August 15, 2013
    Applicant: Hitachi, Ltd.
    Inventors: Yasuko Kojima, Yoshihide Yamaguchi, Masahide Okamoto