Patents by Inventor Sergey Lee

Sergey Lee 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).

  • RE123-BASED OXIDE SUPERCONDUCTOR AND METHOD OF PRODUCTION OF SAME
    Publication number: 20110009273
    Abstract: A method of production of a RE123-based oxide superconductor, said method of production of a RE123-based oxide superconductor characterized by comprising (i) firing a pulse laser at an oxide-based target including RE, Ba, and Cu satisfying the following formulas (1) and (2) to form a plume and (ii) holding a substrate in that plume to form an RE123-based oxide superconducting film: 0.8?2RE/Ba<1.0 ??(1) 0.8?3Ba/2Cu<1.
    Type: Application
    Filed: September 12, 2008
    Publication date: January 13, 2011
    Inventors: Sergey Lee, Koichi Nakao, Noriko Chikumoto
  • Method for preparing bismuth-based high temperature superconductors
    Patent number: 6599862
    Abstract: The invention provides a method for stably preparing a bismuth-based high temperature superconductor of a Bi-2223 single-phase or a Bi/Pb-2223 single phase, wherein a second phase is not allowed to reside, at a low cost and efficiently. With the method described above, mixed powders of raw materials (mixed powders of oxides and carbonates), obtained by mixing the raw materials such that a mixing ratio of constituents, Bi:Sr:Ca:Cu or (Bi, Pb):Sr:Ca:Cu, becomes identical to the stoichiometric ratio of a crystal of the superconductor Bi2Sr2Ca2Cu3Oz, or (Bi, Pb) 2Sr2Ca2Cu3Oz, respectively, are used as raw material for sintering, and the sintering is applied thereto, using KCl as a flux. In this case, the raw material for the sintering as calcinated is preferably used, and the sintering is preferably applied at a sintering temperature kept at a constant level.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: July 29, 2003
    Assignees: Superconductivity Research Laboratory, International Superconductivity Technology Center
    Inventors: Sergey Lee, Setsuko Tajima
  • Method for preparing bismuth-based high temperature superconductors
    Publication number: 20020022577
    Abstract: The invention provides means for stably preparing a bismuth-based high temperature superconductor of a Bi-2223 single-phase or a Bi/Pb-2223 single phase, wherein a second phase is not allowed to reside, at low cost and efficiently. With the means described above, mixed powders of raw materials (mixed powders of oxides and carbonates), obtained by mixing the raw materials such that a mixing ratio of constituents, Bi:Sr:Ca:Cu or (Bi, Pb):Sr:Ca:Cu, becomes identical to a stoichiometric ratio of a crystal of the superconductor Bi2Sr2Ca2Cu3Oz, or (Bi, Pb)2Sr2Ca2Cu3Oz, respectively, are used as raw material for sintering, and the sintering is applied thereto, using KCl as a flux. In this case, the raw material for the sintering as calcinated is preferably used, and the sintering is preferably applied at a sintering temperature kept at a constant level.
    Type: Application
    Filed: July 26, 2001
    Publication date: February 21, 2002
    Inventors: Sergey Lee, Setsuko Tajima