Patents by Inventor Chang Seop Ji

Chang Seop Ji 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).

  • Patent number: 5783655
    Abstract: A process for the preparation of aromatic polyamide pulp having both excellent physical properties and a high degree of polymerization by continuous polymerization and orientation by using of mixed solutions. The solutions are prepared by reacting diamine with aromatic diacid dichloride in an amide and/or urea-based polymerization solvent containing inorganic salts, or a mixture of inorganic salts and a Lewis acid compound. The process can be practiced by polymerization-orientation apparatus located on the continuous transferable polymerization-orientation means comprised of a belt and one or more stirring bars.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: July 21, 1998
    Assignee: Kolon Industries, Inc.
    Inventors: Du Hyun Kim, Seock Chul Ryu, Won Jun Choe, Young Hwan Park, Chang Seop Ji