Patents by Inventor Akiko Kuwabara

Akiko Kuwabara 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).

  • Nonaqueous secondary battery and electronic device
    Patent number: 8795884
    Abstract: In the nonaqueous secondary battery of the present invention, a positive electrode mixture layer included in a positive electrode contains a lithium-containing complex oxide defined by the general formula LixM1yM2zM3vO2 (where, M1 represents at least one transition metal element selected from the group consisting of Co, Ni and Mn, M2 represents at least one metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, M3 represents an element other than Li, M1 and M2, 0.97?x<1.02, 0.8?y<1.02, 0.002?z?0.05, and 0?v?0.05) and has a density of 3.5 g/cm3 or more. A nonaqueous electrolyte contains a fluorinated nitrile compound including two or more cyano groups or a cyano group and an ester group.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: August 5, 2014
    Assignees: Hitachi Maxell, Ltd., Kanto Denka Kogyo Co., Ltd.
    Inventors: Hideo Sakata, Fusaji Kita, Kumiko Ishizuka, Akiko Kuwabara, Yuan Gao
  • NONAQUEOUS SECONDARY BATTERY AND ELECTRONIC DEVICE
    Publication number: 20110052980
    Abstract: In the nonaqueous secondary battery of the present invention, a positive electrode mixture layer included in a positive electrode contains a lithium-containing complex oxide defined by the general formula LixM1yM2zM3vO2 (where, M1 represents at least one transition metal element selected from the group consisting of Co, Ni and Mn, M2 represents at least one metal element selected from the group consisting of Mg, Ti, Zr, Ge, Nb, Al and Sn, M3 represents an element other than Li, M1 and M2, 0.97?x<1.02, 0.8?y<1.02, 0.002?z?0.05, and 0?v?0.05) and has a density of 3.5 g/cm3 or more. A nonaqueous electrolyte contains a fluorinated nitrile compound including two or more cyano groups or a cyano group and an ester group.
    Type: Application
    Filed: April 30, 2009
    Publication date: March 3, 2011
    Inventors: Hideo Sakata, Fusaji Kita, Kumiko Ishizuka, Akiko Kuwabara, Yuan Gao