Patents by Inventor Delmer Ray Pettitt, Jr.

Delmer Ray Pettitt, Jr. 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).

  • Cleaning of extrusion dies
    Patent number: 8297964
    Abstract: Extrusion dies may be cleaned, especially of so-called die drips, by passing a wire over the die orifices in the vicinity of the exit face of the extrusion die. The operation of the extrusion operation is not affected by the passing of the wire through the stream(s) of the extrudate, and so the extrusion operation need not be shut down for the cleaning process. The process is especially useful for cleaning dies through which polymers are extruded.
    Type: Grant
    Filed: October 19, 2007
    Date of Patent: October 30, 2012
    Assignee: E I Du Pont de Nemours and Company
    Inventor: Delmer Ray Pettitt, Jr.