Patents by Inventor Long-Xuan Zhao

Long-Xuan Zhao 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).

  • Process for preparing 2-aminopyridine derivatives
    Patent number: 7220863
    Abstract: A method for preparing 2-aminopyridine derivatives, which comprises substituting of fluorine for hydrazine moiety and reducing with hydrogen using 3-substituted-2,5,6-trifluoropyridine as a starting material, provides 2-aminopyridine derivatives having a purity over 98% under a mild reaction condition.
    Type: Grant
    Filed: August 23, 2005
    Date of Patent: May 22, 2007
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Tae-Ho Park, Long-Xuan Zhao, Sang-Ho Lee
  • Process for preparing 2-aminopyridine derivatives
    Publication number: 20060047124
    Abstract: A method for preparing 2-aminopyridine derivatives, which comprises substituting of fluorine for hydrazine moiety and reducing with hydrogen using 3-substituted-2,5,6-trifluoropyridine as a starting material, provides 2-aminopyridine derivatives having a purity over 98% under a mild reaction condition.
    Type: Application
    Filed: August 23, 2005
    Publication date: March 2, 2006
    Inventors: Tae-Ho Park, Long-Xuan Zhao, Sang-Ho Lee