Patents by Inventor Daisuke Maeda, legal representative

Daisuke Maeda, legal representative 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).

  • Polymer electrolyte for solid polymer type fuel cell and fuel cell
    Patent number: 7258941
    Abstract: A polyelectrolyte for a solid polymeric fuel cell comprising an aromatic polyether sulfone block copolymer comprising a hydrophilic segment containing sulfonic acid groups and a hydrophobic segment having no sulfonic acid group at a hydrophilic segment weight fraction W2 to hydrophobic segment weight fraction W1 ratio falling within a range of 0.6<W2/W1<2.0. The polyelectrolyte for a solid polymeric fuel cell is inexpensive and durable, and its proton conductivity is less influenced by humidity and temperature.
    Type: Grant
    Filed: May 7, 2002
    Date of Patent: August 21, 2007
    Assignee: UBE Industries, Ltd.
    Inventors: Tetsuji Hirano, Masayuki Kinouchi, Chizuyo Maeda, legal representative, Daisuke Maeda, legal representative, Megumi Maeda, legal representative, Mitsuo Maeda, deceased