Patents by Inventor Mituo Takahata

Mituo Takahata 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).

  • Electrolytic solution for lithium cell and method for producing same
    Patent number: 6197205
    Abstract: The present invention relates to a method for producing an electrolytic solution containing a solute of lithium hexafluorophosphate. This method includes a step of (a) reacting lithium fluoride with phosphorus pentafluiride, in a nonaqueous organic solvent that is used for producing a lithium cell's electrolytic solution, thereby to form the lithium hexafluorophosphate dissolved in the solvent. According to this method, both yield and purity of the reaction product are sufficiently high, and the reaction can easily be managed. According to need, after the step (a), the nonaqueous organic solvent may be replaced with another nonaqueous organic solvent. The present invention further relates to a method for purifying an electrolytic solution used for a lithium cell. This electrolytic solution contains an acid impurity having at least one hydrogen atom in the molecule.
    Type: Grant
    Filed: May 18, 2000
    Date of Patent: March 6, 2001
    Assignee: Central Glass Company, Limited
    Inventors: Shouichi Tsujioka, Mituo Takahata, Hisakazu Itou, Tadayuki Kawashima, Keiji Sato, Hiromi Sasaki, Sunao Yamamoto