Patents by Inventor Hidetoshi Karasawa

Hidetoshi Karasawa 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).

  • FUEL CELL USING THE CATALYST OF METAL CLUSTERS
    Publication number: 20080193819
    Abstract: According to the present invention, it is possible to provide a catalyst which includes metal clusters containing a non-platinum element as the catalyst active ingredient, these metal clusters having species of a metal having different valences, and exhibits an improved electrode performance per unit price of the used metal, compared to catalysts using platinum. When this catalyst is applied to an electrode catalyst for fuel cell, a low-cost fuel cell system can be realized without using expensive platinum as the active ingredient. This catalyst can be applied to DMFC and PEFC fuel cells.
    Type: Application
    Filed: January 25, 2008
    Publication date: August 14, 2008
    Inventors: Yasuo YOSHII, Hidetoshi Karasawa, Kazutoshi Higashiyama, Hidehiro Iizuka, Shuichi Kanno, Shuichi Suzuki
  • Direct cycle-type atomic power plant with means for suppressing transfer from a liquid phase to a vapor phase of radioactive nitrogen oxides
    Patent number: 5084235
    Abstract: A direct cycle type atomic power plant provided with a means for suppressing transfer of radioactive nitrogen compounds generated by nuclear reaction in the core from the reactor water to steam, where an increase in the dose rate in the main steam system and the turbine system due to carry-over of radioactive nitrogen atom, .sup.16 N, generated in the core can be suppressed, and the radioactivity therein can be reduced.
    Type: Grant
    Filed: July 19, 1990
    Date of Patent: January 28, 1992
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Eishi Ibe, Hidetoshi Karasawa, Maroto Nagase, Masaharu Sakagami, Shunsuke Uchida, Minoru Miki, Yamato Asakura, Motoaki Utamura, Fumio Kawamura, Katsumi Ohsumi, Yoshinori Chiba
  • Method of inhibiting radioactive substances from eluting into cooling water in a nuclear plant and an apparatus therefor
    Patent number: 4894202
    Abstract: Disclosed is a method and apparatus for inhibiting radioactive substances eluting into cooling water of a nuclear plant. The method uses an index consisting of an amount of iron adhered onto the fuel cladding surface, that is calculated from the iron concentration of the cooling water and the operation time. A formation of a layer of the iron oxide on the fuel cladding surface is confirmed based upon the covering ratio of 100%. When the covering ratio is smaller than 100%, the iron concentration in the cooling water is controlled to remain constant at a maximum concentration. The Fe/Ni molar concentration ratio in the cooling water is adjusted to be set from about 2 to 10 after the layer of iron oxide reaches a covering ratio of 100%. .sup.58 Co ion and .sup.60 Co ion concentrations in the cooling water can be decreased without greatly increasing the concentration of precipitating radioactive crud, and the surface dosage in the primary system can be decreased at the time of regular checking.
    Type: Grant
    Filed: October 2, 1987
    Date of Patent: January 16, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Nagase, Yamato Asakura, Hidetoshi Karasawa, Masaharu Sakagami, Shunsuke Uchida, Toshio Sawa, Katsumi Ohsumi