Patents by Inventor Jeffrey D. MacDonald

Jeffrey D. MacDonald 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).

  • Extruder assembly
    Patent number: 7390118
    Abstract: The present invention provides an improved extruder assembly, that includes a wiper for wiping a screw portion in a low pressure extruder stage, whereby the wiping of the screw portion improves melt conveyance through the low pressure extruder stage. The present invention has particular utility when used in a low pressure venting and entrainment extruder stage of a single screw compounding extruder. The present invention also provides an extrusion/injection unit for use in-line compounding molding system that incorporates the improved extruder assembly.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: June 24, 2008
    Assignee: Husky Injection Molding Systems Ltd.
    Inventors: Jeffrey D. MacDonald, Alireza Mortazavi, Denise Craig, Robert Ilmonen, Geoffrey Gow