Patents by Inventor Junichi Oota

Junichi Oota 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).

  • Alloyed steel powder for powder metallurgy
    Patent number: 4985309
    Abstract: An alloyed steel powder for metallurgy is provided with a water-atomized alloyed steel powder wherein an alloy component, an oxide of which is difficult to be reduced with hydrogen in the production of the powder, has been prealloyed in a composition range not exerting a bad influence upon compressibility of the steel powder, and an alloy component or components easier to be reduced with hydrogen than the above alloy component, the said easily reducible alloy component or components being partially diffused and adhered in a powdered form to the particle surfaces of the water-atomized alloyed steel powder.The composite powder of the invention has a coating layer of at least one element selected from nickel, copper, molybdenum and tungsten which is partially diffused and adhered in a powder form to the surface of a chromium containing prealloyed steel powder.
    Type: Grant
    Filed: August 1, 1988
    Date of Patent: January 15, 1991
    Assignee: Kawasaki Steel Corporation
    Inventors: Kuniaki Ogura, Junichi Oota, Teruyoshi Abe, Shigeaki Takajo