Patents by Inventor Shuuji Mitani

Shuuji Mitani 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).

  • Separator for lithium ion secondary battery and lithium ion secondary battery provided therewith
    Patent number: 7311994
    Abstract: A separator for a lithium ion secondary battery, comprising a porous base material containing polyolefin, and a porous layer containing a vinylidene fluoride resin as a main component provided on at least one surface of the porous base material is excellent in electrolytic solution retention properties, adhesion and bondability to electrodes, and dimensional stability, and also has high and uniform ionic conductivity, reduced interfacial resistance to electrodes, and shutdown properties. A lithium ion secondary battery having excellent capacity characteristics, charge and discharge characteristics, cycle characteristics, safety and reliability can be provided by using the separator.
    Type: Grant
    Filed: September 11, 2003
    Date of Patent: December 25, 2007
    Assignee: Tomoegawa Paper Co., Ltd.
    Inventors: Masahide Sugiyama, Hiroki Totsuka, Shuuji Mitani, Masanori Takahata
  • Separator for lithium ion secondary battery and lithium ion secondary battery provided therewith
    Publication number: 20040053122
    Abstract: A separator for a lithium ion secondary battery, comprising a porous base material containing polyolefin, and a porous layer containing a vinylidene fluoride resin as a main component provided on at least one surface of the porous base material is excellent in electrolytic solution retention properties, adhesion and bondability to electrodes, and dimensional stability, and also has high and uniform ionic conductivity, reduced interfacial resistance to electrodes, and shutdown properties. A lithium ion secondary battery having excellent capacity characteristics, charge and discharge characteristics, cycle characteristics, safety and reliability can be provided by using the separator.
    Type: Application
    Filed: September 11, 2003
    Publication date: March 18, 2004
    Applicant: Tomoegawa Paper Co., Ltd.
    Inventors: Masahide Sugiyama, Hiroki Totsuka, Shuuji Mitani, Masanori Takahata