Patents by Inventor Douglas W. Muzyka

Douglas W. Muzyka 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).

  • Process for controlling quality of yarns
    Patent number: 4954302
    Abstract: A process for controlling the relative viscosity of synthetic yarns during production thereof. At least three pressure measurements are taken at three spaced locations in a transfer line for carrying molten polymer to a spinneret. Temperature and throughput of polymer in said transfer line are measured. An estimated relative viscosity of yarn produced by employing a predetermined correlation between pressure drop, throughput, temperature and relative viscosity is then calculated. A meaningful operating condition in the melting zone is adjusted in response to deviations in the estimated relative viscosity of said yarn from a desired relative viscosity of said yarn.
    Type: Grant
    Filed: August 31, 1988
    Date of Patent: September 4, 1990
    Assignee: Du Pont Canada, Inc.
    Inventors: Ernest K. A. Marchildon, Douglas W. Muzyka, Michel M. Dumoulin