Patents by Inventor Hironori Echigoya

Hironori Echigoya 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 for nuclear reactors
    Patent number: 4970047
    Abstract: A fuel assembly for a nuclear reactor comprises a fuel bundle in which a number of fuel rods are regularly arranged and a channel box surrounding the outer periphery of the fuel bundle. The interior of the channel box is designed so that the inner cross sectional area of the channel box increases from the upstream side of the coolant flow towards the downstream side thereof, for example, by stepwisely shaving the inner surface of the channel box. The corner portions of the channel box may be chamfered to improve the stress due to the inner pressure.
    Type: Grant
    Filed: October 13, 1988
    Date of Patent: November 13, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Makoto Ueda, Toru Mitsutake, Koichi Sakurada, Koji Hiraiwa, Yasuhiro Hattori, Mamoru Nagano, Hironori Echigoya