Patents by Inventor Pi-Chen Cheng

Pi-Chen Cheng 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).

  • Base generator
    Patent number: 9617223
    Abstract: The present invention provides a base generator having the structure of formula (1): wherein R1, R2, R3, R4, R5, and Y{circle around (?)} are defined as in the specification. The base generator of the present invention can be used for imidization of a polyimide precursor, promoting crosslinking of epoxy monomers, or crosslinking of polyurethane or polyurea.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: April 11, 2017
    Assignee: Eternal Materials Co., Ltd.
    Inventors: Pi-Chen Cheng, Meng-Yen Chou, Chuan Zong Lee, Chung-Jen Wu
  • Polyimide precursor composition and preparation method and use thereof
    Patent number: 9334369
    Abstract: The present invention provides a polyimide precursor composition comprising a polyimide precursor and a thermal base generator having the structure of formula (1): wherein R1, R2, R3, R4, R5 and Y? are as defined in the specification. The present invention also provides a polyimide prepared from the aforementioned precursor composition, and a preparation method thereof.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: May 10, 2016
    Assignee: Eternal Chemical Co., Ltd.
    Inventors: Pi-Chen Cheng, Meng-Yen Chou, Chuan Zong Lee, Chung-Jen Wu