Patents by Inventor Francis R. Duerr

Francis R. Duerr 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).

  • Extrusion die
    Patent number: 4465454
    Abstract: In an extrusion die, restricted flow of material from large to small feed holes is relieved by the formation of a transition zone within the die. The transition zone is formed by extending either or both of the large and small feed holes so that they axially overlap.
    Type: Grant
    Filed: March 29, 1983
    Date of Patent: August 14, 1984
    Assignee: Corning Glass Works
    Inventors: Francis R. Duerr, Leonard W. Pokallus