Patents by Inventor Donald E. Hallam

Donald E. Hallam 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).

  • Apparatus and process for forming alternate twist plied yarn and product therefrom
    Patent number: 5012636
    Abstract: A process for making alternate S and Z twist plied yarn from individual singles yarns includes the steps of tensioning the singles yarns as they move in a path through the process, twisting the individual yarns in either an S or Z direction, stopping the forward movement of the yarn, then bonding the ply-twisted yarns at a node while applying twist, stopping the twisting operation, then repeating the procedure while twisting in the opposite direction.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: May 7, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald E. Hallam, Peter Popper, Harold F. Staunton, Paul W. Yngve
  • Apparatus and process for forming alternate twist plied yarn and product therefrom
    Patent number: 5003763
    Abstract: A process for making alternate S and Z twist plied yarn from individual singles yarns includes the steps of tensioning the singles yarns as they move in a path through the process, twisting the individual yarns in either an S or Z direction, stopping the forward movement of the yarn, then bonding the ply-twisted yarns at a node while applying twist, stopping the twisting operation, then repeating the procedure while twisting in the opposite direction.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: April 2, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald E. Hallam, Peter Popper, Harold F. Staunton, Robert E. Taylor, Paul W. Yngve
  • Apparatus and process for forming alternate twist plied yarn
    Patent number: 4873821
    Abstract: A process for making alternate S and Z twist plied yarn from individual singles yarns includes the steps of tensioning the singles yarns as they move in a path through the process, twisting the individual yarns in either an S or Z direction, stopping the forward movement of the yarn, then bonding the ply-twisted yarns at a node while applying twist, stopping the twisting operation, then repeating the procedure while twisting in the opposite direction.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: October 17, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald E. Hallam, Peter Popper, Harold F. Staunton, Robert E. Taylor, Paul W. Yngve
  • Textile doff servant
    Patent number: 4555067
    Abstract: A power-driven, wheeled vehicle which interacts semiautomatically with winders in a spinning area to doff completed yarn packages, automatically delivers the packages to an unload station to unload the packages from the vehicle and then moves to another winder to repeat the operation. The wheeled vehicle and the winders are located on opposite sides of a service aisle. A frame extendable and retractable across the aisle is mounted to the vehicle. The means for extending and retracting the frame includes two four-bar linkages coupled to the vehicle and the frame and to each other.
    Type: Grant
    Filed: May 24, 1984
    Date of Patent: November 26, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard J. Angelucci, Andrew P. Cope, Donald E. Hallam, Harry E. Ladd