Patents by Inventor Gaoyuan G. Chen

Gaoyuan G. Chen 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).

  • Process of making multifilament yarn
    Patent number: 6756000
    Abstract: The present invention is directed to processes for the manufacture of multifilament yarn, including the steps of extruding multifilaments of a polymer containing at least mole 85 percent L-lactide and not more than 15 mole percent glycolide, spinning the extruded multifilaments to form a spun yarn, passing the spun multifilament yarn through an orientation roll heated at a temperature of less than 98° C. and drawing the spun multifilament yarn to a draw ratio of at least 4:1 to form an oriented multifilament fiber, annealing the oriented multifilament yarn at a temperature greater than that of the orientation roll, and redrawing the annealed, oriented multifilament yarn by at least 10 percent at a temperature lower than the temperature of annealing.
    Type: Grant
    Filed: October 2, 2001
    Date of Patent: June 29, 2004
    Assignee: Ethicon, Inc.
    Inventors: Attila Antal, Gaoyuan G. Chen, Dominick Egidio, Anthony Tiano, Edward Walker
  • Multifilament yarns and methods of making
    Publication number: 20020077448
    Abstract: The present invention is directed to processes for the manufacture of multifilament yarn, including the steps of extruding multifilaments of a polymer containing at least mole 85 percent L-lactide and not more than 15 mole percent glycolide, spinning the extruded multifilaments to form a spun yarn, passing the spun multifilament yarn through an orientation roll heated at a temperature of less than 98° C. and drawing the spun multifilament yarn to a draw ratio of at least 4:1 to form an oriented multifilament fiber, annealing the oriented multifilament yarn at a temperature greater than that of the orientation roll, and redrawing the annealed, oriented multifilament yarn by at least 10 percent at a temperature lower than the temperature of annealing.
    Type: Application
    Filed: October 2, 2001
    Publication date: June 20, 2002
    Inventors: Attila Antal, Gaoyuan G. Chen, Dominick Egidio, Anthony Tiano, Edward Walker