Patents by Inventor Changwon Sohn

Changwon Sohn 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).

  • Manufacturing method of colored diamond by ion implantation and heat treatment
    Patent number: 7604846
    Abstract: The present invention relates to a manufacturing method of colored diamond and, more particularly, to a manufacturing method of colored diamond by ion implantation and heat treatment. The manufacturing method comprises a first step of implanting ions to the surface of diamond by accelerating the ions under vacuum, and a second step of heat-treating the implanted diamond. By implanting ions inducing the change in the optical band gap of a diamond, the manufacturing method provides a colored diamond with relatively lower cost compared to a metal ion implantation in the prior art, and a uniform color is obtained by heat treatment. Additionally, the manufacturing method of the present invention provides a diamond having various colors with permanent color development effects, by controlling the condition of ion implantation and heat treatment.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: October 20, 2009
    Assignee: Korea Atomic Energy Research Institute
    Inventors: Jaewon Park, Jaehyung Lee, Changwon Sohn, Byungho Choi
  • Manufacturing method of colored diamond by ion implantation and heat treatment
    Publication number: 20050196547
    Abstract: The present invention relates to a manufacturing method of colored diamond and, more particularly, to a manufacturing method of colored diamond by ion implantation and heat treatment. The manufacturing method comprises a first step of implanting ions to the surface of diamond by accelerating the ions under vacuum, and a second step of heat-treating the implanted diamond. By implanting ions inducing the change in the optical band gap of a diamond, the manufacturing method provides a colored diamond with relatively lower cost compared to a metal ion implantation in the prior art, and a uniform color is obtained by heat treatment. Additionally, the manufacturing method of the present invention provides a diamond having various colors with permanent color development effects, by controlling the condition of ion implantation and heat treatment.
    Type: Application
    Filed: February 28, 2005
    Publication date: September 8, 2005
    Inventors: Jaewon Park, Jaehyung Lee, Changwon Sohn, Byungho Choi