Patents by Inventor Sang W. Park

Sang W. Park 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).

  • Electron gun for a color cathode-ray tube
    Patent number: 5532547
    Abstract: An electron gun for a color cathode-ray tube, adapted for large television sets or high-definition monitors, has first and second quadrupole electrodes connected to a static voltage focus electrode and to a dynamic voltage focus electrode, respectively, to form a quadrupole lens. The first quadrupole electrode is composed of first electrode pieces connected to the static voltage focus electrode and arranged on left and right sides of three beam-passing apertures formed on the static voltage focus electrode, and each of the first electrode pieces has at least one arc having a radius identical to or larger than that of the beam-passing apertures. The second quadrupole electrode is composed of second electrode pieces connected to upper and lower portions of the dynamic voltage focus electrode, and each of the second electrode pieces has arcs having a radius identical or larger than that of the beam-passing apertures. The first electrode pieces are inserted inside of the second electrode pieces.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: July 2, 1996
    Assignee: Goldstar Co., Ltd.
    Inventors: Sang W. Park, Hyun C. Kim
  • Polycyanamide compounds generating photoelectric current and process for their preparation
    Patent number: 5259988
    Abstract: A polycyanamide compound represented by the general formula (I): ##STR1## wherein A is ##STR2## X is an integer ranging from 10 to 30. This polycyanamide compound of the formula (I) is a photoelectric material and, in this respect, can be used for photovoltaic cells, macromolecular cells and functional elements such as photo sensors.
    Type: Grant
    Filed: December 3, 1992
    Date of Patent: November 9, 1993
    Assignee: Korea Institute of Science and Technology
    Inventors: Sang W. Park, Kyung H. Yoo, Yong K. Kang, Young H. Lee, Hyung Y. Kim, Hyon T. Kwak, Yeong I. Lee
  • Herbicidal aryloxyacetic acid derivatives
    Patent number: 5139564
    Abstract: Aryloxyacetic acid derivatives of the formula ##STR1## where R.sub.1 is H, CH.sub.3, Cl, Br, F, or NO.sub.2 ; R.sub.2 is H or Cl; R.sub.3 is H, CH.sub.3 C(CH.sub.3).sub.3, Cl, Br or NO.sub.2 ; R.sub.4 is H or Cl; R.sub.5 is H, CH.sub.3, Cl, Br or F; and R.sub.6 is 2-pyridylamino or 2-ethylene thiourea, are useful a herbicides.
    Type: Grant
    Filed: January 3, 1991
    Date of Patent: August 18, 1992
    Inventors: Sang W. Park, Byung I. Lee
  • Process for preparing piperazinyl quinolone derivatives
    Patent number: 5051505
    Abstract: A novel process for preparing piperazinyl quinolone derivatives of the formula (I) is disclosed. The process comprises reacting dihaloquinolones with piperazine derivatives and tetraalkyl ammonium halides in the presence of a polar solvent such as acetonitrile, dimethylformamide, pyridine, sulfolane and dimethyl sulfoxide.
    Type: Grant
    Filed: August 2, 1990
    Date of Patent: September 24, 1991
    Assignee: Korea Institute of Science and Technology
    Inventors: Sang W. Park, You S. Kim, Jin H. Lee
  • Golf ball dispenser
    Patent number: D351002
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: September 27, 1994
    Inventor: Sang W. Park