Patents by Inventor Shunichi Yuhara

Shunichi Yuhara 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).

  • Method of producing metallic materials for the components of nuclear reactors
    Patent number: 4744824
    Abstract: A method of producing metallic materials for the components of nuclear reactors is disclosed, which comprises adding a boron-=containing material having a value of .sup.11 B/(.sup.10 B+.sup.11 B) larger than that of natural boron to molten metal before deboronification refining. The resulting metallic materials are used even under neutron irradiation without causing .sup.10 B(n, .alpha.).sup.7 Li nuclear reaction.
    Type: Grant
    Filed: May 29, 1986
    Date of Patent: May 17, 1988
    Assignees: Doryokuro Kakunenryo Kaihatsu Jigyodan, Kawasaki Steel Corporation
    Inventors: Shunichi Yuhara, Yutaka Oka, Terufumi Sasaki, Osamu Masuko, Kiyohiko Nohara, Tomoo Tanaka
  • Process for improving decarburization resistance of chrome-molybdenum steel in sodium
    Patent number: 4334937
    Abstract: A process for improving decarburization resistance of chrome-molybdenum steel in sodium is provided which comprises subjecting the chrome-molybdenum steel to cold working to attain a working ratio of not less than 5%, thereby forming numerous nuclei for carbide formation in the steel material, and heat-treating the cold-worked steel to form stable, fine carbide particles. Alternatively, by subjecting the steel material to warm working at a temperature of 600.degree. to 750.degree. C., both the working step and the heat treatment step can be accomplished in one step.
    Type: Grant
    Filed: June 24, 1980
    Date of Patent: June 15, 1982
    Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
    Inventors: Shunichi Yuhara, Naruo Hasegawa, Takashi Nakasuji, Norichika Aoki