Patents by Inventor Su-Han Yu

Su-Han Yu 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).

  • Patent number: 7527690
    Abstract: The present invention relates to a ferroelectric ceramic compound having the composition of the following formula: s[L]?x[P]y[M]z[N]p[T], a ferroelectric ceramic single crystal, and preparation processes thereof. The ferroelectric ceramic compound and the single crystal according to the present invention are relaxor ferroelectrics having high piezoelectricity, a high electromechanical coefficient and a high electrooptical coefficient, and are useful for manufacturing tunable filters for radio communication, optical communication devices, surface acoustic wave devices, and the like. Particularly, the process of preparing the single crystal according to the present invention enables preparation of a single crystal having a diameter of 5 cm or greater and a single crystal wafer with uniform composition.
    Type: Grant
    Filed: July 30, 2003
    Date of Patent: May 5, 2009
    Assignee: Ibule Photonics Co., Ltd.
    Inventors: Sang-Goo Lee, Min-Chan Kim, Byung-Ju Choi, Min-Chul Shin, Su-Han Yu
  • Publication number: 20060214131
    Abstract: The present invention relates to a ferroelectric ceramic compound having the composition of the following formula: s[L]-x[P]y[M]z[N]p[T], a ferroelectric ceramic single crystal, and preparation processes thereof. The ferroelectric ceramic compound and the single crystal according to the present invention are relaxor ferroelectrics having high piezoelectricity, a high electromechanical coefficient and a high electrooptical coefficient, and are useful for manufacturing tunable filters for radio communication, optical communication devices, surface acoustic wave devices, and the like. Particularly, the process of preparing the single crystal according to the present invention enables preparation of a single crystal having a diameter of 5 cm or greater and a single crystal wafer with uniform composition.
    Type: Application
    Filed: July 30, 2003
    Publication date: September 28, 2006
    Inventors: Sang-Goo Lee, Min-Chan Kim, Byung-Ju Choi, Min-Chul Shin, Su-Han Yu