Patents by Inventor Xue-Zhi Qin

Xue-Zhi Qin 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).

  • Preparation of 4-bromotetrahydrofluoreneones
    Publication number: 20060247319
    Abstract: This invention describes a process for making 4-bromotetrahydrofluorenones, including novel bromination and chlorination steps, and interemediates. Also described are novel tetrahydrofluoreneones.
    Type: Application
    Filed: April 26, 2006
    Publication date: November 2, 2006
    Inventors: Mark Huffman, Xue-Zhi Qin, Jonathan Rosen
  • Method for analyzing isomers of enalapril and enalaprilat
    Patent number: 5670655
    Abstract: The invention relates to a method for analyzing degenerates of enalapril maleate and enalaprilat, potent angiotensin converting enzyme inhibitors.
    Type: Grant
    Filed: September 10, 1996
    Date of Patent: September 23, 1997
    Assignee: Merck & Co. Inc.
    Inventors: Xue-Zhi Qin, Giuseppina Visentini, Qingxi Wang