Patents by Inventor Kazutoshi Hamada

Kazutoshi Hamada 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).

  • Separator for fuel cells
    Patent number: 6436567
    Abstract: The present invention provides a separator for fuel cell which alleviates the problems of the prior art, which has high conductivity, high gas impermeability and high strength, and which can be produced easily. The separator for fuel cell according to the present invention is a molding comprising a conductive carbon powder and a polymer compound, wherein the conductive carbon powder in the molding has an aspect ratio of 4 to 60.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: August 20, 2002
    Assignee: Nisshinbo Industries, Inc.
    Inventors: Kazuo Saito, Atsushi Hagiwara, Fumio Tanno, Toshiharu Okamoto, Kazutoshi Hamada
  • Abrasive device that maintains normal line of contact with curved abrasive surface and method of using same
    Patent number: 5895311
    Abstract: An abrasive apparatus adopted to abrade a curved surface of workpiece includes: an abrading head including an abrading tip having a substantially spherical outer surface and a rotating shaft supporting the abrading tip, the abrading head being positioned to face the curved surface; a thrust moving mechanism for relatively moving the abrading head and the curved surface; a lateral moving mechanism for relatively moving the abrading head and the curved surface; a pivotal moving mechanism for relatively moving the abrading head and the curved surface pivotally around a center point; and a controller for controlling the abrading head, the thrust moving mechanism, the lateral moving mechanism and the pivotal moving mechanism synchronously so that the abrading tip contacts and presses the curved surface at any point thereon with a substantially constant pressure in a direction consistent with a normal line thereat.
    Type: Grant
    Filed: June 4, 1997
    Date of Patent: April 20, 1999
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takekazu Shiotani, Kimihiro Wakabayashi, Kazutoshi Hamada, Takaaki Sakakibara, Toshimasa Fujisawa
  • Polarizable electrode for electric double-layer capacitor, and electric double-layer capacitor using said polarizable electrode
    Patent number: 5786555
    Abstract: The present invention provides:a polarizable electrode for use in electric double-layer capacitor, which is made of a carbon composite material composed mainly of:100 parts by weight of an activated carbon,0.05 parts by weight of an amorphous carbon,0.1-1,000 parts by weight of a conductive agent, and0.03-90 parts by weight of a fibrillated carbon; andan electric double-layer capacitor comprising at least one pair of a positive electrode and a negative electrode each containing the above polarizable electrode and each impregnated with an electrolytic solution.The above polarizable electrode and electric double-layer capacitor are substantially free from the drawbacks of conventional polarizable electrodes and conventional electric double-layer capacitors, have a low internal resistance and a long life, and can be charged with or can discharge a large electric current of several amperes to several hundreds of amperes momentarily.
    Type: Grant
    Filed: August 6, 1996
    Date of Patent: July 28, 1998
    Assignee: Nisshinbo Industries, Inc.
    Inventors: Kazuo Saito, Atsushi Hagiwara, Toshiharu Okamoto, Kazutoshi Hamada, Osamu Hasegawa