Patents by Inventor Chuan-Yang Liu

Chuan-Yang Liu 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).

  • Depolymerization of polytetrahydrofuran derivatives
    Patent number: 6429321
    Abstract: The invention discloses a method for depolymerization of a mixture containing polytetrahydrofuran derivatives, including heating the mixture comprising polytetrahydrofuran derivatives at 100-250° C. in the presence of a &bgr;-zeolite catalyst to obtain tetrahydrofuran, whereby the tetrahydrofuran monomer can be recovered from the waste materials in the preparation of polytetramethylene ether glycols.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: August 6, 2002
    Assignee: TCC Chemical Corporation
    Inventors: Wen-Fa Lin, Chuan-Yang Liu, Jun-Yi Chen, Long-Shuenn Jean