Patents by Inventor Burkhard Freist

Burkhard Freist 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).

  • Apparatus for producing monodisperse powder from rubber or rubber articles
    Patent number: 5273419
    Abstract: The invention relates to an apparatus for producing monodisperse powdered rubber and includes an extruder and individual conveying, grinding and discharge sections with respective cooling units corresponding thereto. The cooling units are arranged outside of the extruder and receive the grinding stock after each grinding process in order to cool and transport the stock to the feed opening of the following conveying, grinding and discharge section of the extruder.
    Type: Grant
    Filed: August 28, 1992
    Date of Patent: December 28, 1993
    Assignee: Hermann Berstorff Maschinenbau GmbH
    Inventors: Dieter Mayer, Burkhard Freist