Patents by Inventor Takafumi Oura

Takafumi Oura 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 ELECTROLYTE SECONDARY BATTERY
    Publication number: 20010016289
    Abstract: The present invention relates to a nonaqueous electrolyte secondary battery, and more particularly to its separator, and it is an object thereof to prevent electrolyte leakage accident due to elevation of cell internal pressure even if the cell is exposed to high temperature without sacrificing the cell capacity.
    Type: Application
    Filed: January 8, 1998
    Publication date: August 23, 2001
    Inventors: TAKAFUMI OURA, MASAKI KITAGAWA, HAJIME NISHINO, HIZURU KOSHINA
  • Secondary battery
    Patent number: 6114065
    Abstract: A cell capable of preventing precipitation of lithium on a negative electrode plate in the final stage of a cycle life and achieving a superior cycling performance and high safety and reliability is provided. In a rechargeable secondary cell using a non-aqueous electrolyte, a positive electrode contains an active material and a conductive element, and Ketjenblack, a mixture of Ketjenblack and flake graphite or a mixture of Ketjenblack and acetylene black is employed as such conductive element.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: September 5, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kaoru Inoue, Takafumi Oura, Masaki Kitagawa, Hizuru Koshina