Patents by Inventor Tamotsu Koyano

Tamotsu Koyano 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 for producing iron-nitride powders
    Patent number: 5330554
    Abstract: A method for producing iron-nitride powder comprises the steps of introducing iron powder and NH.sub.3 gas or N.sub.2 gas in a vessel, and milling the iron powder in the NH.sub.3 gas or the N.sub.2 gas. Furthermore, a method for producing iron-nitride powder comprises the steps of introducing iron powder and intermetallic compound powder of iron and nitrogen in a vessel, and milling the iron powder and the intermetallic compound powder. The obtained iron-nitride powder consists essentially 85.1 to 99 at % of iron and the rest of nitrogen, and has a body centered cubic structure.
    Type: Grant
    Filed: August 28, 1992
    Date of Patent: July 19, 1994
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Tamotsu Koyano, Uichiro Mizutani