Patents by Inventor Andre Dziewanowski

Andre Dziewanowski 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 of manufacturing extruded pipes and apparatus for carrying out the method
    Patent number: 4686075
    Abstract: A method of manufacturing extruded pipes where plasticized material, for example plastic material, is advanced to an extrusion nozzle comprising a circular gap (2). The method is especially characterized in that the material is transported axially in said gap (2) while material is moved, for example rotated, in the circumferential direction of the gap (2) so that the material at least partially is caused to assume an orientation deviating from the axial direction, whereby a non-axial orientation will prevail in the extruded pipe (3) and increase the strength. The invention also relates to an apparatus for carrying out the method.
    Type: Grant
    Filed: December 11, 1984
    Date of Patent: August 11, 1987
    Assignee: Mats Lundberg
    Inventors: Andre Dziewanowski, Krzysztof Piotrowski, Krzysztof Zaremba