Patents by Inventor Tsuyumi Takashiba

Tsuyumi Takashiba 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).

  • Cooling liquid composition for fuel cell
    Patent number: 8187763
    Abstract: A coolant composition for a fuel cell unit, which contains at least one aliphatic alcohol having unsaturated bonds in the molecules having 2 to 20 carbon atoms each. The coolant composition maintains the electrical conductivity of the coolant at 10 ?S/cm or below as well as the fluctuation of the electrical conductivity within the range of 0 to 10 ?S/cm.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: May 29, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventors: Hiroshi Egawa, Nobuyuki Kaga, Tsuyumi Takashiba, Shiro Yagawa
  • Coolant composition for fuel cell
    Patent number: 7670498
    Abstract: The present invention relates to a coolant composition for fuel cell coolant, comprised of sulfur containing alcohol or sulfur containing phenol having at least one sulfur atom per molecule, which effectively prevents increase of electric conductivity due to oxidation of its base component for a long time. The coolant composition when diluted with water to a predetermined concentration effectively suppresses increase of electric conductivity of the coolant and maintain fluctuation of electric conductivity within the range from 0 to 10 ?S/cm so that power generation efficiency of the fuel cell may not be lowered.
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: March 2, 2010
    Assignees: Honda Motor Co., Ltd., Shishiai-Kabushikigaisha
    Inventors: Michihiro Hori, Hiroshi Egawa, Hidemi Kado, Tsuyumi Takashiba, Shiro Yagawa