Patents by Inventor Nam-Sik Yoon

Nam-Sik Yoon 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).

  • Phosphine precursor for preparing quantum dot and quantum dot prepared therefrom
    Patent number: 11912915
    Abstract: The present invention relates to a phosphine precursor for the preparation of a quantum dot, and a quantum dot prepared therefrom. Using the phosphine precursor for the preparation of a quantum dot of the present invention, a quantum dot with improved luminous efficiency and higher luminous color purity can be provided.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: February 27, 2024
    Assignee: SK Chemicals Co., Ltd.
    Inventors: Hee Il Chae, Jeong Ho Park, Kyung Sil Yoon, Ju-Sik Kang, Yu Mi Chang, Nam-Choul Yang, Jae Kyun Park, Song Lee
  • Antenna device for generating inductively coupled plasma
    Patent number: 6288493
    Abstract: The invention relates to an antenna device of a low impedance for generating a large quantity of inductively coupled plasma to process a large size of a specimen with adjustment for a uniform distribution in the density of plasma, comprising: a high frequency power source; a first antenna for receiving the high frequency power supplied from the high frequency power source; and a second antenna connected in parallel with the first antenna for receiving the high frequency power supplied from the high frequency power source, wherein a resonant state is kept between the first and second antennas.
    Type: Grant
    Filed: May 2, 2000
    Date of Patent: September 11, 2001
    Assignees: Jusung Engineering Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Yong-Kwan Lee, Nam-Sik Yoon, Sung-Sik Kim, Pyung-Woo Lee, Hong-Young Chang