Patents by Inventor Freidhelm Pfitzer

Freidhelm Pfitzer 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).

  • Plastic Rotor for a vacuum pump
    Patent number: 10138888
    Abstract: A rotor for a vane cell pump—in particular, for a vacuum pump—with a base body that is made of plastic and can be driven by rotation, and that rotates about an axis of rotation during operation, wherein the base body comprises a guiding section for slidably receiving a pump vane and wherein the base body is flanked in the direction of the axis of rotation by a first bearing surface and a second bearing surface, wherein the second bearing surface comprises bearing sections that are at a distance from one another and that lie on a circular path that is arranged concentrically to the axis of rotation.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: November 27, 2018
    Assignee: Joma-Polytec GmbH
    Inventors: Hans-Peter Ott, Bernd Hess, Martin Thoma, Thomas Gulde, Torsten Helle, Freidhelm Pfitzer