Patents by Inventor Hak M. Kim

Hak M. Kim 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).

  • Aromatic polyamide fiber free of crystal defect layers perpendicular to the fiber axis
    Patent number: 5047500
    Abstract: A fiber product comprising one or more fibers of aromatic polyamide polymer having a microscopic structure of an extended molecular chain, free of crystal defect layers perpendicular to the fiber axis, a high inherent viscosity of at least 3.0 [dl/g], and a high tensile strength of at least 15 g/d, said inherent viscosity being determined at 30.degree. C. using a concentration of 0.5 grams of said polymer in 100 ml of concentration sulfuric acid.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: September 10, 1991
    Assignee: Kolon Industries, Inc.
    Inventors: Ho J. Park, Moo S. Rhim, Hak M. Kim, Du H. Kim, Seog C. Yoo, Sang H. Kim, Sa N. B. Park, Ink S. Han, John T. Park, Si M. Kim
  • Two-stage process for preparing aromatic polyamide film
    Patent number: 4971744
    Abstract: A process for preparing aromatic polyamide film 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, continuously extruding through a film die under a draw ratio or subjecting to a shear and contacting the prepolymer with a second solvent which is a polymerization accelerating-precipitation solvent to obtain an aromatic polyamide film free of crystal defect layer perpendicular to the film axis and having high strength and a high degree of molecular orientation.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: November 20, 1990
    Assignee: Kolon Industries, Inc.
    Inventors: Ho J. Park, Moo S. Rhim, Hak M. Kim, Du H. Kim, Seog O. Yoo, Sang H. Kim, Sang B. Park, Ink S. Han, Jong T. Park, Si M. Kim
  • 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
  • Composite fiber
    Patent number: 4460649
    Abstract: The present invention relates to a composite fiber consisting of two components, for example, such as a polyamide and a polyester, and to a multi-segment fiber wherein the two components thereof can be separated into a plurality of microfibers by chemical and physical treatments. Particularly, the invention relates to a composite fiber having low loss of weight in a chemical treatment and which can easily be separated into outer and inner components. After separation the composite fiber provides excellent performance.
    Type: Grant
    Filed: September 2, 1982
    Date of Patent: July 17, 1984
    Assignee: Kolon Industries Inc.
    Inventors: Yeun H. Park, Jong L. Woo, Hak M. Kim