Patents by Inventor William L. Bice

William L. Bice 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).

  • Patent number: 4425790
    Abstract: An apparatus is provided for predicting the extrusion performance of a thermoplastic resinous polymer, which includes at least three and preferably four capillaries arranged in series with each successive capillary having a larger passageway than that of the immediately preceding capillary and with each capillary having substantially the same ratio of passageway length to cross-sectional area. The apparatus also includes a pump for forcing a heated polymer melt through the capillaries at a constant volumetric flow rate, a sensor for measuring the temperature of the polymer melt, a sensor for measuring the pressure drop of the polymer across each capillary, and a combination recorder and processor for determining the polymer viscosity in each capillary (different shear rates), whereby the extrusion performance of the polymer can be predicted. A method for predicting extrusion performance of a thermoplastic resinous utilizing these polymer capillaries is also provided.
    Type: Grant
    Filed: December 21, 1981
    Date of Patent: January 17, 1984
    Assignee: The Dow Chemical Company
    Inventors: William L. Bice, Ernest D. Graves, Jr., Gerald P. Wagener