Patents by Inventor Ullrich Stark

Ullrich Stark 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).

  • Combined carpet yarns by open end rotor spinning
    Patent number: 4802330
    Abstract: A method for manufacturing a combined yarn, by open end rotor spinning, suitable for use in carpets is disclosed.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: February 7, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Paul W. Yngve, Peter Artzt, Gerhard Egbers, Ullrich Stark, Heinz Muller
  • Automatic piecing of combination open end rotor spun yarn
    Patent number: 4788817
    Abstract: An improved method and apparatus for stringing up or re-stringing a balanced ply-twisted combination yarn of two components to insure strong piecing-up points. The end of the combination yarn and the end of a continuous filament yarn, which becomes a component of the combination yarn, are both prepared for piecing and inserted into the rotor of an open-end spinning device. Upon start up, the combination yarn engages staple fibers in the rotor consolidating groove while the continuous filament yarn engages the combination yarn within the rotor without any contact of the continuous filament yarn with the rotor consolidating groove.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: December 6, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Peter Artzt, Gerhard Egbers, Heinz Muller, Ullrich Stark
  • Combined carpet yarns by open end rotor spinning
    Patent number: 4729214
    Abstract: A method of manufacturing a combined yarn which includes feeding staple fibers to the collection groove of an open-end spinning rotor, twisting the staple fibers into a staple fiber yarn, combining the staple fiber yarn with a continuous filament yarn which is also fed into the spinning rotor and then twisting the continuous filament yarn and the staple fiber yarn together to form a balanced ply yarn.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: March 8, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Paul W. Yngve, Peter Artzt, Gerhard Egbers, Ullrich Stark, Heinz Muller