Patents by Inventor Sa Ng B. Park

Sa Ng B. Park 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).

  • Two-stage process for preparing aromatic polyamide fiber
    Patent number: 4876040
    Abstract: A process for preparing aromatic polyamide fibers wherein an aromatic diamine and an aromatic diacidchloride are dissolved in an amide polymerization solvent containing an inorganic salt, a partial polymerization is effected at a low temperature to form an optically anisotropic liquid crystalline prepolymer dope, and the liquid crystalline prepolymer dope is subjected to a molecular orientating polymerization in a polymerization accelerating-precipitation solvent to provide aromatic polyamide fibers free of a crystal defect layer perpendicular to the fiber axis and having high strength and high degree of molecular orientation.
    Type: Grant
    Filed: March 10, 1987
    Date of Patent: October 24, 1989
    Assignee: Kolon Industries, Inc.
    Inventors: Ho J. Park, Moo S. Rhim, Hak M. Kim, Du H. Kim, Seog C. Yoo, Sang H. Kim, Sa Ng B. Park, Ink S. Han, Jong T. Park, Si M. Kim