Patents by Inventor Steven John Deren

Steven John Deren 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).

  • Extrudate shrinkage control and reduction
    Patent number: 6695606
    Abstract: An extrusion apparatus for extruding visco-elastic materials includes an extruder head for preliminary shaping of a visco-elastic melt and a splice bar die assembly for final shaping of the visco-elastic melt. Both the extruder head and the die assembly have flow channels that include low elongational flow zones where elongational flow is reduced and controlled, thereby reducing and controlling the resulting shrinkage of the extrudate. Extrudate shrinkage can also be reduced and controlled by controlling the die swell of the visco-elastic melt by rotating the roller at a selected roller speed less than the melt speed.
    Type: Grant
    Filed: July 25, 2000
    Date of Patent: February 24, 2004
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Gary Robert Burg, Steven John Deren, Richard David Vargo