Patents by Inventor Sigeyuki Iwasa

Sigeyuki Iwasa 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 secondary battery and secondary battery containing the same
    Patent number: 7312000
    Abstract: A battery, which has excellent safety in an overcharged state and is excellent in low-temperature characteristics and cycle characteristics, is provided. The electrolytic solution of the secondary battery contains a compound which has a diazine N,N?-dioxide structure represented by general formula (1). in which, n, m, n?, and m? each independently are an integer 0 or larger; the diazine rings and the benzene rings may be condensed alternately or randomly; and substituents R1, R2, R3, R4, Ra, Rb, Rc, and Rd each independently represent hydrogen atom, halogen atom, or specific group. However, when n is 2 or larger, then Ra and Rb may be the same or different, and when n? is 2 or larger, then Rc and Rd may be the same or different. In addition, these substituents, in cooperation with each other, may form a ring structure.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: December 25, 2007
    Assignee: NEC Corporation
    Inventors: Jiro Iriyama, Yukiko Morioka, Sigeyuki Iwasa, Kentaro Nakahara, Masaharu Satoh, Masahiro Suguro
  • Electrolytic solution for secondary battery and secondary battery containing the same
    Publication number: 20040197664
    Abstract: A battery, which has excellent safety in an overcharged state and is excellent in low-temperature characteristics and cycle characteristics, is provided.
    Type: Application
    Filed: April 28, 2004
    Publication date: October 7, 2004
    Inventors: Jiro Iriyama, Yukiko Morioka, Sigeyuki Iwasa, Kentaro Nakahara, Masaharu Satoh, Masahiro Suguro