Patents by Inventor Willis D. Bethay, Jr.

Willis D. Bethay, Jr. 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).

  • Control of synthetic yarns during drawing with heated rolls
    Patent number: 4293518
    Abstract: The uniformity of bulked continuous filament yarns is improved by stabilizing the yarn path on draw pins and on heated draw rolls in a coupled spin-draw-bulk process wherein just before the yarn contacts a draw pin it is passed between two parallel guide pins in tandem in a zig-zag path which cause the plane of the yarn ribbon to rotate about the yarn axis by an angle of from 50.degree. to 90.degree. and back before contacting a draw pin. More uniform spreading of the yarn filaments on the heated rolls saves energy by permitting the use of lower roll temperatures.
    Type: Grant
    Filed: July 31, 1980
    Date of Patent: October 6, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Willis D. Bethay, Jr.