Patents by Inventor Mi-Seon Ryoo

Mi-Seon Ryoo 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).

  • Stable precursor of polyimide and a process for preparing the same
    Patent number: 5952448
    Abstract: This invention relates to a poly (imide amic ester) random copolymer, a precursor thereof, and a process for preparing the same. Specifically this invention relates to a novel precursor of polyimide, poly(imide amic ester) which is chemically stable and has excellent workability in either liquid or solid state, a polyimide obtained therefrom and a process for preparing the same.
    Type: Grant
    Filed: December 30, 1997
    Date of Patent: September 14, 1999
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Myung-Hun Lee, Seo-Bong Lee, Chang-Jin Lee, Eun-Kyoung Kim, Mi-Seon Ryoo