Patents by Inventor Kazuhisa Matsunaka

Kazuhisa Matsunaka 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).

  • Process of vitrifying radioactive liquid waste with suppressed formation of gaseous ruthenium
    Patent number: 4943395
    Abstract: An improved process of vitrifying a radioactive liquid waste by absorbing a radioactive liquid waste into a glass frit cartridge made of molded glass fibers and heat-melting the cartridge to vitrify the liquid waste. The invention is characterized by absorbing a radioactive liquid waste containing ruthenium into the glass frit cartridge together with a reducing agent. By the process of the invention, the formation of gaseous ruthenium is effectively suppressed during the heat-melting.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: July 24, 1990
    Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
    Inventors: Noriaki Sasaki, Kazuhisa Matsunaka