Patents by Inventor Patrick J. Duncan

Patrick J. Duncan 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).

  • Addition of diethylene glycol in continuous production of polyester yarn
    Patent number: 4025592
    Abstract: Polyester texturing feed yarns are produced by preparing an ethylene terephthalate polymer from ethylene glycol plus a small amount of diethylene glycol, and dimethyl terephthalate or terephthalic acid, and melt-spinning the polymer into filaments. The filaments may be partially oriented by spinning at high speed without cold drawing, or may be fully drawn after conventional spinning. The diethylene glycol is added in controlled amounts to provide uniform dyeability in fabrics prepared from the yarn after texturing.
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: May 24, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: David E. Bosley, Patrick J. Duncan
  • Polyester fibers
    Patent number: H1275
    Abstract: Polyester filaments of 0.5-2 denier per filament from ethylene terephthalate polymers modified both by polyethylene oxide and by tetraethyl silicate to give polymers of commercial spinning viscosities, and textile fibers and fabrics having greatly improved dye rates, good color stability to standard lightfastness and wash cycles and good pilling, when compared to unmodified polyester and polyester/cotton blend fabrics.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: January 4, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Patrick J. Duncan