Patents by Inventor Il Cheon Kwon

Il Cheon Kwon 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).

  • Publication number: 20040121149
    Abstract: Disclosed a polyurethane elastic fiber and a method of producing the polyurethane elastic fiber. The method of producing the polyurethane elastic fiber is characterized in that polyol with high molecular weight and diisocyanate with excessive amount are mixed in a condition of a designated shear rate and prepolymerized to produce a prepolymer, the prepolymer is reacted with the chain extender and the chain terminator to produce a polymer, and an additive is added to the polymer and the final polymer is spun. The method of producing the polyurethane elastic fiber according to the present invention improves the stability of the polymer, has an excellent spinnability even in high-speed spinning, and remarkably reduces the generation of wave yarns. The polyurethane elastic fiber of the present invention is excellent in heat resistance, thermosetting efficiency and coherence strength between the monofilaments.
    Type: Application
    Filed: December 16, 2003
    Publication date: June 24, 2004
    Inventors: Il-Cheon Kwon, Doo-Hyun Kim, Kyung-Hwan Ro
  • Patent number: 6545074
    Abstract: This invention relates to a polyurethaneurea elastic fiber of which the weatherability is excellent and the preparing method thereof. The invention prepares the polyurethaneurea elastic fiber by adding the formamidine type ultraviolet adsorber of the following formula I to the spinning dope and the strength maintenance rate of the polyurethaneurea elastic fiber is over 90% after being leaved for 24 hours at the Fade-O-Meter in which the sunshine carbon arc is installed. Wherein, R and R represent an each alkyl group of 1 to 5 carbon atoms.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: April 8, 2003
    Assignee: Kolon Industries, Inc.
    Inventors: Il Cheon Kwon, Seok Chul Ryu, Hyung Don Huh