Patents by Inventor George Ng'ang'a Wanyoike

George Ng'ang'a Wanyoike 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 producing camptothecin derivatives
    Patent number: 8299251
    Abstract: The invention offers a method of hydrogenating camptothecin in inert solvent in the presence of nickel catalyst, whereby selective hydrogenation of camptothecin can be very efficiently accomplished using the low-cost catalyst.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: October 30, 2012
    Assignees: Sichuan Xieli Pharmaceutical Co., Ltd., MicroBiopharm Japan Co., Ltd.
    Inventors: Asako Toyoda, Hazuki Nagai, George Ng'ang'a Wanyoike