Patents by Inventor Masahiro Azumi

Masahiro Azumi 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 steel surface hardening treatment and an apparatus therefor
    Patent number: 5268040
    Abstract: A method of cooling steel parts from austenitic stage to a temperature that is higher than its Ms point after carburization of said steel part to carry out diffusion transformation, then carrying out a nitriding treatment and further applying shot peening, and in order to implement said method provide a carburizing zone, a cooling zone for carrying out diffusion transformation and a nitriding treatment zone connected through opening and shutting doors, and provide feeding devices in each of said zones to feed the steel parts to the next zone.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: December 7, 1993
    Assignee: Dowa Mining Co., Ltd.
    Inventors: Takeshi Naito, Masahiro Azumi