Patents by Inventor Shigemitsu Matsuzawa

Shigemitsu Matsuzawa 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).

  • Platinum alloy electrocatalyst and acid-electrolyte fuel cell electrode using the same
    Patent number: 4794054
    Abstract: A platinum alloy electrocatalyst composed of a platinum-iron-cobalt alloy comprising 40 to 80 atomic percent of platinum, 10 to 40 atomic percent of iron and 10 to 40 atomic percent of cobalt supported on a suitable carrier has outstandingly high stability and catalytic activity. Electrodes using such an electrocatalyst (particularly when used as cathodes in acid-electrolyte fuel cells) remain stable for longer periods and have more than 30% higher output than electrodes using conventional catalysts.
    Type: Grant
    Filed: June 24, 1987
    Date of Patent: December 27, 1988
    Assignee: Nippon Engelhard Ltd.
    Inventors: Takashi Ito, Shigemitsu Matsuzawa, Katsuaki Kato
  • Platinum-copper alloy electrocatalyst and acid-electrolyte fuel cell electrode using the same
    Patent number: 4716087
    Abstract: A platinum alloy electrocatalyst, composed of a platinum-copper alloy containing 15 to 50 atomic percent of copper (the balance being platinum) and supported on a suitable carrier, shows high activity over long periods because of the enhanced specific activity of supported metal and improved maintainability of its specific surface area. Thus acid-electrolyte fuel cells using the electrode comprising such an electrocatalyst feature better output performances and longer service life than fuel cells using conventional electrodes.
    Type: Grant
    Filed: December 10, 1986
    Date of Patent: December 29, 1987
    Assignee: Nippon Engelhard Ltd.
    Inventors: Takashi Ito, Shigemitsu Matsuzawa, Katsuaki Kato