Patents by Inventor Sang O. Yoon

Sang O. 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).

  • Compositions of high frequency dielectrics
    Patent number: 5569632
    Abstract: The present invention provides compositions of high frequency dielectric ceramics represented by the following formula:(1-y) SrTiO.sub.3 -y La(Zn.sub.1-x)/2 Mg.sub.x/2 Ti.sub.1/2)O.sub.3wherein 0.ltoreq.x.ltoreq.0.99; and 0.4.ltoreq.y.ltoreq.0.9. The compositions have a dielectric constant of about 28 to about 60, Qxf.sub.0 (GHz) of about 25,000 to about 71,000 and a temperature coefficient of the resonant frequency of about -56 to about 84 ppm/.degree. C. The compositions may be applied to various communications systems which require high frequency dielectric ceramics.
    Type: Grant
    Filed: June 9, 1995
    Date of Patent: October 29, 1996
    Assignee: Korea Institute of Science and Technology
    Inventors: Hyung J. Jung, Hyun J. Kim, Kyong Y. Kim, Seok J. Yoon, Sang O. Yoon, Tetsuro Nakamura, Mitsuru Itoh, Yoshiyouki Inaguma
  • Dielectric material for high frequencies
    Patent number: 5521130
    Abstract: There is disclosed a dielectric material for high frequencies comprising a composition system represented by the following formula:(1-Y)SrTiO.sub.3 --Y(La.sub.1-x Nd.sub.x)(Mg.sub.1/2 Ti.sub.1/2)O.sub.3wherein0.01.ltoreq.X<1.0 and0.4.ltoreq.Y.ltoreq.0.55.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: May 28, 1996
    Assignee: Korea Institute of Science & Technology
    Inventors: Tetsuro Nakamura, Mitsuru Itoh, Yoshiyuki Inaguma, Kyung Y. Kim, Sang O. Yoon
  • Metal oxide group thermistor material
    Patent number: 5246628
    Abstract: Metal oxide group NTC theremistor material made from MnCO.sub.3 +NiO+CuO+Co.sub.3 O.sub.4 +FeO.sub.3 TiO.sub.2 group as a basic composition. The invention is characterized by metal oxide group thermistor material made from MnCO.sub.3 +NiO+ZnO+Co.sub.3 O.sub.4 +Fe.sub.2 O.sub.3 +TiO.sub.2 group or MnCO.sub.3 +NiO+CuO+ZnO+Fe.sub.2 O.sub.3 +TiO.sub.2 group as a basic composition having respectively composition amounts by weight for each ingredient described in the text. According to the invention, the sintering temperature of the material can be reduced relative to the conventional material, and therefore there is advantage that manufacturing expense of the thermistor can be reduced.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: September 21, 1993
    Assignee: Korea Institute of Science & Technology
    Inventors: Hyung J. Jung, Sang O. Yoon, Ki Y. Hong, Jeon K. Lee