Patents by Inventor Kazuya Ishii

Kazuya Ishii 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 assembly and nuclear reactor
    Patent number: 5145635
    Abstract: A high conversion nuclear reactor core has fuel assemblies made up from large numbers of axially-extending uranium-plutonium mixed oxide fuel rods. The fuel rods are densely packed so as to give a high conversion ratio of fissile substances, preferably approaching unity. The average plutonium enrichment in the assemblies is higher in their bottom, upstream halves, than in their top downstream halves. This has the effect of reducing a potentially dangerously high void coefficient in the core.
    Type: Grant
    Filed: March 14, 1991
    Date of Patent: September 8, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Kazuya Ishii, Motoo Aoyama, Yoshihiko Ishii, Sadao Uchikawa, Renzo Takeda, Osamu Yokomizo