Patents by Inventor Dennis G. De Wald

Dennis G. De Wald 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).

  • Screw for extruding a food mash
    Patent number: 4312265
    Abstract: An extruder screw for use in the processing of a food mash is disclosed, in which, the mash is introduced into an inlet opening in an extruder barrel and conveyed by a substantially coextensive screw to an outlet or discharge opening and then through an extrusion die. The extruder screw comprises a single flight helical screw section initiating at the inlet opening and terminating within the extruder barrel, with a flightless section immediately following thereafter, and, a further helical screw section immediately following the flightless section and extending to the proximity of the outlet opening of the extruder barrel.
    Type: Grant
    Filed: May 29, 1980
    Date of Patent: January 26, 1982
    Assignee: Koppers Company, Inc.
    Inventors: William R. Enterline, Dennis G. De Wald, James R. Boose