Patents by Inventor Darwyn E. Walker

Darwyn E. Walker 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).

  • Self-crimping yarn
    Patent number: 4489543
    Abstract: Polyester polymer is extruded through converging capillaries at different speeds to merge and form a combined stream. The stream is cooled to form a filament, which is withdrawn at a high speed. A plurality of such filaments are combined into yarn which self-crimps upon heating. In some embodiments, the yarn has a variable denier.
    Type: Grant
    Filed: December 10, 1981
    Date of Patent: December 25, 1984
    Assignee: Celanese Corporation
    Inventors: James E. Bromley, John R. Dees, Harold M. Familant, Wayne T. Mowe, Darwyn E. Walker
  • Self crimping yarn and process
    Patent number: 4419313
    Abstract: Two molten streams of polyester polymer are extruded at different speeds to intersect below the spinneret. The spinning speed is relatively high, and the resulting filament has shrinkage peaks and valleys along its length. When a number of such filaments are relaxed in a yarn bundle, the yarn spontaneously develops crimp.
    Type: Grant
    Filed: July 9, 1980
    Date of Patent: December 6, 1983
    Assignee: Fiber Industries, Inc.
    Inventors: James E. Bromley, John R. Dees, Harold M. Familant, Wayne T. Mowe, Darwyn E. Walker
  • Nylon 66 spinning process
    Patent number: 4123492
    Abstract: Polyamide yarn is melt spun at high speed and drawn almost immediately (between 0.002 and 0.25 seconds) after solidification. Turbine driven feed roll replaces conventional feed and separator roll. Process displays unusually low drawing tension, exceptionally uniform yarn.
    Type: Grant
    Filed: May 22, 1975
    Date of Patent: October 31, 1978
    Assignee: Monsanto Company
    Inventors: Michael M. McNamara, Wayne T. Mowe, Darwyn E. Walker