Patents by Inventor Sona Kim

Sona Kim 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 inhibiting the oxidation of hard metal powder
    Patent number: 5603781
    Abstract: A method for inhibiting the oxidation of powder of a hard metal, characterized by heat-treating the milled powder of a hard metal at a temperature between about 300.degree. C. and 500.degree. C. for at least 1 hr in vacuum is disclosed.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: February 18, 1997
    Assignee: Korea Institute of Science and Technology
    Inventors: Jong-Ku Park, Sona Kim