Patents by Inventor Bao Xue

Bao Xue 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).

  • Semi-Synthetic Conversion of Paclitaxel to Docetaxel
    Publication number: 20080051590
    Abstract: A process is provided for the semi-synthesis of taxane derivatives useful in the preparation of docetaxel, in particular, the semi-synthesis of protected taxane derivatives in a one pot reaction of protecting the C-2?, C-7 and C-10 positions and introducing a t-Boc group at the nitrogen of the amide group at the C-3? position in paclitaxel and subsequently conversion to docetaxel, and derivatives used therein.
    Type: Application
    Filed: June 29, 2005
    Publication date: February 28, 2008
    Inventors: Ragina Naidu, Samuel Foo, Bao Xue, Bo Fan
  • Optical coupler
    Patent number: 5757995
    Abstract: A transition waveguide is provided between one main waveguide and two branching waveguides. The transition waveguide includes a stepped portion, of which the waveguide width suddenly slightly spreads stepwise with respect to the distal end portion of the main waveguide, and an extension portion extending from the stepped portion toward the branching waveguides. The waveguide width of the extension portion is substantially fixed or gradually increased in a region ranging from the stepped portion to the branching waveguides.
    Type: Grant
    Filed: November 4, 1996
    Date of Patent: May 26, 1998
    Assignee: NHK Spring Co., Ltd.
    Inventors: Bao Xue Chen, Michiya Masuda