Patents by Inventor Norbert Siegmund

Norbert Siegmund 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).

  • Mixing device having axially adjustable mixing blades
    Patent number: 5358332
    Abstract: The vessel of a mixing device accommodates a mixing tool having suitable blades fixed to a hub. A rotary drive shaft extends into the vessel and is coupled to the hub in such manner as to rotate the tool while enabling the tool selectively to be displaced axially on the shaft between an operative position in which the blades are in close proximity to the base wall of the vessel, and an inoperative position in which the blades are spaced sufficiently from the base wall to provide access for cleaning. Axial displacement of the tool is controlled through external actuation of a threaded lifting device provided within the hub and acting between the hub and shaft.
    Type: Grant
    Filed: October 1, 1993
    Date of Patent: October 25, 1994
    Assignee: Dr. Herfeld GmbH & Co. KG
    Inventors: Michael Derksen, Norbert Siegmund