Patents by Inventor Chul Won Han

Chul Won Han 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).

  • Single crystal growing apparatus and method
    Patent number: 5186911
    Abstract: A horizontal Bridgman single crystal growing apparatus using a direct monitoring electric furnace suitable for a single crystal growing of III-V, II-VI group compound semiconductor materials (InP, CdTe, etc.) including a gallium arsenide (GaAs). The apparatus is composed of: a heater wire being formed around a quartz tube for supporting, a cylindrical double quartz tube arranged with cooling water or gas inlet and outlet for circulation externally and coated with gold thin film on the internal wall surface thereof, thereby the high temperature heating over 1240.degree. C. is possible to obtain within a short period of time and also the cooling is possible, and whole process of the single crystal growing can be observed directly with naked eyes.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: February 16, 1993
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Suk Ki Min, Seung Chul Park, Chul Won Han
  • Vertical gradient freezing apparatus for compound semiconductor single crystal growth
    Patent number: 5135726
    Abstract: A vertical gradient freeze single crystal growing apparatus utilizing a direct monitoring furnace which is possible to obtain rapid high temperature heating and uniform temperature distribution by using direct monitoring furnace as a higher temperature part furnace provided with double quartz tube applied with gold thin film, and also capable of observing entire process of single crystal growing directly by naked eye.
    Type: Grant
    Filed: March 20, 1991
    Date of Patent: August 4, 1992
    Assignee: Korea Institute of Science and Technology
    Inventors: Suk Ki Min, Seung Chul Park, Chul Won Han, Young Ju Park, Kwang Bo Shim