Patents by Inventor Ji-Man Ryu

Ji-Man Ryu 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).

  • Flaky Powder for an Electromagnetic Wave Absorber, and Method for Producing Same
    Publication number: 20110056593
    Abstract: A flake powder for an electromagnetic wave absorber and a method of manufacturing the flake powder are described. The flake powder is made-up of nano-sized metals and pores forming a flake body having a composite structure formed by aggregation of nano-sized magnetic metals. The method includes the steps of preparing a metal oxide; milling the metal oxide into nano-sized powder; reducing the milled metal oxide powder to form a magnetic metal powder; flaking the reduced magnetic metal powder; and heat treating the flaked magnetic metal powder to relieve residual stress thereof.
    Type: Application
    Filed: July 31, 2009
    Publication date: March 10, 2011
    Applicant: IUCF-HYU (Industry-University Cooperation Foundation Hanyang University)
    Inventors: Jai-Sung Lee, Sang-Kyun Kwon, Ji-Man Ryu