Patents by Inventor Naiwen Zhang

Naiwen 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 preparing poly (lactic acid)-based resin and its co-polymers
    Patent number: 7538181
    Abstract: A method for preparing poly (lactic acid)-based resin or its co-polymers with high molecular weight, the method comprising a condensation process using a thiaole cation condensing agent, as well as the polymers obtained therefrom.
    Type: Grant
    Filed: January 20, 2006
    Date of Patent: May 26, 2009
    Assignee: Shanghai Tong-Jie-Liang Biomaterials Co., Ltd.
    Inventors: Jie Ren, Qinfeng Wang, Naiwen Zhang
  • Method for preparing poly (lactic acid)- based resin and its co-polymers
    Publication number: 20070027296
    Abstract: A method for preparing poly (lactic acid)-based resin or its co-polymers with high molecular weight, the method comprising a condensation process using a thiaole cation condensing agent, as well as the polymers obtained therefrom.
    Type: Application
    Filed: January 20, 2006
    Publication date: February 1, 2007
    Applicant: SHANGHAI TONG-JIE-LIANG BIOMATERIALS CO., LTD.
    Inventors: Jie Ren, Qinfeng Wang, Naiwen Zhang