Patents by Inventor David E. Bartrum

David E. Bartrum 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 apparatus
    Patent number: 4187270
    Abstract: An extruder method is taught for forming a co-extruded article wherein the die head of a first extruder forms the primary extrudate which is shaped from a cylindrical form into a thin oblong elongated form. A second extruder feeds its plasticated extrudate to the first extruder die head where the second extrudate is shaped into a thin narrow film for merging the two extrudate into a single elongated composite film for extrusion as an integral film from the die head as a shaped article.
    Type: Grant
    Filed: May 15, 1978
    Date of Patent: February 5, 1980
    Assignee: The B. F. Goodrich Company
    Inventor: David E. Bartrum