Patents by Inventor Herbert W. Heisterkamp

Herbert W. Heisterkamp 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).

  • Method and apparatus for making film
    Patent number: 4176155
    Abstract: The present invention is concerned with the art of manufacturing film from synthetic thermoplastic resinous materials, and more particularly relates to an improved method and apparatus for the manufacture of thermoplastic resinous film in tubular form.
    Type: Grant
    Filed: August 12, 1974
    Date of Patent: November 27, 1979
    Assignee: The Dow Chemical Company
    Inventors: Herbert W. Heisterkamp, Carl B. Havens