Patents by Inventor Syotaro Mizobuchi

Syotaro Mizobuchi 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 using machine parts made of austenitic cast iron having resistance to stress corrosion cracking in contact with salt water
    Patent number: 4861395
    Abstract: Austenitic cast iron has excellent corrosion resisting properties and has been preferentially used in machines or machine parts intended for handling corrosive fluids such as seawater. Cases, however, have been reported of machines or machine parts made of austenitic cast iron failing after they had been put to prolonged service at relatively low temperatures. The present inventors have located stress corrosion cracking at the cause of this failure.In accordance with the present invention, methods of using salt water resisting machines or machine parts made of austenitic cast iron that has graphite in the form of spheroids or nodules and which comprises by weight %: C.ltoreq.3.0, Si=1.0-3.0, Mn.ltoreq.1.5, P.ltoreq.0.08, Ni>24-28%, Cr.ltoreq.5.5 and the balance being Fe to minimize stress corrosion are provided.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: August 29, 1989
    Assignee: Ebara Corporation
    Inventors: Matsuho Miyasaka, Katsuhiro Ichikawa, Katsumi Sasaki, Syotaro Mizobuchi, Naoaki Ogure