Patents Assigned to Dynisco Extrusion, Inc.
  • Polymer filteration apparatus and method of use
    Patent number: 6270703
    Abstract: The present invention includes a filtration apparatus for an injection molding machine where the injection molding machine includes a screw housed within a bore for generating molten polymer. A tip member extends axially from the screw. The tip member has radially extending upstream and downstream flanges positioned axially apart from each other. A filter encircles the tip member and is capable of filtering the molten polymer. An annular ring member encircles the tip member and is slidably positioned within the bore between the upstream and downstream flanges. The ring member is capable of sliding between the flanges for directing the molten polymer through the filter or preventing back flow of the molten polymer past the upstream flange.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: August 7, 2001
    Assignee: Dynisco Extrusion, Inc.
    Inventors: Paul D. Wildman, Delano B. Trott
  • Polymer filtration method and apparatus
    Patent number: 6168411
    Abstract: The present invention includes a filtration apparatus for an injection molding machine where the injection molding machine includes a screw housed within a bore for generating molten polymer. A tip member extends axially from the screw. The tip member has radially extending upstream and downstream flanges positioned axially apart from each other. A filter encircles the tip member and is capable of filtering the molten polymer. An annular ring member encircles the tip member and is slidably positioned within the bore between the upstream and downstream flanges. The ring member is capable of sliding between the flanges for directing the molten polymer through the filter or preventing back flow of the molten polymer past the upstream flange.
    Type: Grant
    Filed: March 18, 1999
    Date of Patent: January 2, 2001
    Assignee: Dynisco Extrusion, Inc.
    Inventor: Paul D. Wildman