Patents by Inventor Wo K. Kwok

Wo K. Kwok 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: 5618364
    Abstract: Lofty battings are prepared by a process involving carding to make one or more webs of fibers, preferably using a blend of mechanically-crimped filling fibers with bicomponent fibers of helical configuration, and that preferably also contains binder fibers, the fiber orientations preferably being randomized in the web(s) before cross-lapping to build up the batt, and preferably followed by spraying with resin and curing, thus providing a bonded batt in which the loft is improved by the presence or the different crimp configurations and/or randomized orientations that are fixed in the fibers in the bonded batt.
    Type: Grant
    Filed: January 3, 1996
    Date of Patent: April 8, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wo K. Kwok
  • Patent number: 5578368
    Abstract: A fire-resistant material used in items such as sleeping bags, comforters, wearing apparel, upholstered furniture and mattress tops comprises a fiberfill batt and a layer of a fire-resistant aramid fiber contacting at least one side of the aramid fiber layer. The fiberfill batt may comprise synthetic fiber, which may be either polyester fiber or polyolefin fiber. Alternatively, the fiberfill batt may comprise natural fiber. The aramid fiber layer may comprise poly(m-phenylene isophthalamide) fiber, poly(p-phenylene terephthalamide) fiber or a blend of poly(m-phenylene isophthalamide) and poly(p-phenylene terephthalamide) fiber. The aramid fiber layer may be needle-punched, hydroentangled, or laminated to the fiberfill batt.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: November 26, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Herman H. Forsten, Michael S. Frankosky, Wo K. Kwok
  • Patent number: 5527600
    Abstract: Improved polyester fiberfill batts for apparel and other uses are prepared of polyester fiber and binder fiber, sprayed with a soft resin by oven bonding and hot roll treatment. This provides bonded batting which is characterized by softness and drapability, good insulating performance, low levels of fiber leakage or percolation through shell fabrics, enhanced durability when laundered by washing/drying or by dry cleaning, and enhanced structural integrity whereby it hangs freely without the need for quilting into small size panels.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: June 18, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Michael S. Frankosky, Wo K. Kwok
  • Patent number: 5225242
    Abstract: Improved polyester fiberfill batts for apparel and other uses are prepared of polyester fiber and binder fiber, sprayed with a soft resin by oven bonding and hot roll treatment. This provides bonded batting which is characterized by softness and drapability, good insulating performance, low levels of fiber leakage or percolation through shell fabrics, enhanced durability when laundered by washing/drying or by dry cleaning, and enhanced structural integrity whereby it hangs freely without the need for quilting into small size panels.
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: July 6, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Michael S. Frankosky, Wo K. Kwok, Donald T. Ziesel
  • Patent number: 5093190
    Abstract: A process is disclosed for making spunlaced acrylic/polyester fabrics comprising applying low impact water jet energy to a fabric web and vacuum dewatering the resulting spunlaced fabric. The spunlaced fabrics exhibit very low wet and dry particle counts and high absorbency thereby making them particularly useful in cleanroom wiper applications and as coverstock for sanitary napkins, diapers and the like.
    Type: Grant
    Filed: October 22, 1990
    Date of Patent: March 3, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Wo K. Kwok, James R. Vincent
  • Patent number: 5023131
    Abstract: A blend, a batt, and a process for making the batt from the blend is disclosed. The blend and batt are made from a uniform combination of cotton and copolyester binder fibers wherein the binder fibers have a melting temperature of 230.degree. to 340.degree. F.
    Type: Grant
    Filed: May 22, 1990
    Date of Patent: June 11, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Wo K. Kwok