Patents by Inventor Defa ZHANG

Defa ZHANG 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).

  • METHOD FOR PREPARATION OF FLUTICASONE PROPIONATE
    Publication number: 20080125407
    Abstract: Taught is a method for preparing S-fluoromethyl-6?,9?-difluoro-11?-hydroxy-16?-methyl-17?-propionyloxy-3-oxoandrosta-1,4-diene-17?-carbothioate (fluticasone propionate). The present method is simple, convenient, and mild, yields highly pure product, and is suitable for use commercially on a large scale.
    Type: Application
    Filed: January 26, 2008
    Publication date: May 29, 2008
    Applicant: SHANGHAI AURISCO INTERNATIONAL TRADING CO., LTD.
    Inventors: Dingjun CHU, Defa ZHANG