Patents by Inventor Ryukichi Mizuno

Ryukichi Mizuno 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).

  • Apparatus and method for melting and treating metal wastes
    Patent number: 4591454
    Abstract: An apparatus for melting and treating metal wastes including radioactive wastes, including a melting and treating vessel formed of the upper surface of a truck and split mold, wherein metal wastes are charged into the vessel in a closed system and melted by an electroslag melting method using a non-consumable electrode. This invention also provides a method which includes the steps of charging a slag melt starting agent and slag into the vessel in layers, and passing electricity through the non-consumable electrode to thereby heat the starting agent.
    Type: Grant
    Filed: August 21, 1984
    Date of Patent: May 27, 1986
    Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
    Inventors: Katsuyuki Ohtsuka, Ryukichi Mizuno, Koji Yanagida, Kazuo Kitagawa, Atsuhiro Ochiai, Minoru Harada, Hiroshi Matsumoto
  • Method of stabilized operation of acid digestion kettle of tantalum
    Patent number: 4587098
    Abstract: A method of minimizing corrosion deterioration and hydrogen absorption embrittlement of tantalum encountered in performing acid digestion of organic waste matter put in an acid digestion kettle of tantalum containing high temperature high concentration sulfuric acid includes the addition of nitric acid, nitrous acid, nitrates, nitrites and/or nitrogen oxides to the sulfuric acid bath.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: May 6, 1986
    Assignees: Doryokuro Kakunenryo Kaihatsu Jigyodan, Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Katsuyuki Ohtsuka, Ryukichi Mizuno, Hitoshi Miyazaki, Toshio Fukuzuka, Kazutoshi Shimogori, Hiroshi Satoh, Fumio Kami Kubo