Patents by Inventor Siegfried Pfaff

Siegfried Pfaff 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).

  • Patent number: 4583747
    Abstract: A bearing seal between the internal space of a centrifuge and its drive part utilizes, in a preferred embodiment, three similar sealing elements arranged in axial succession to each other and pressed against a protective bushing of the drive shaft in an elastic manner. The protective bushing of the drive shaft has a reduced diameter in the contact area of the sealing element closest to the internal space of the centrifuge, so that protective gas introduced into the space between the sealing elements and the subsequent sealing elements flows into the internal space of the centrifuge.
    Type: Grant
    Filed: December 5, 1984
    Date of Patent: April 22, 1986
    Assignee: Krauss-Maffei A.G.
    Inventors: Erhard Aufderhaar, Ernst Gruebl, Siegfried Pfaff
  • Patent number: 4569760
    Abstract: A discharge shaft arrangement is provided for a bottom discharge vertical centrifuge with a filter drum in which a suspension is separated into solids and a filtrate, wherein at least one discharge shaft is provided in the area of the drum hub, under the drum in a base plate. The discharge shaft has an approximately kidney-shaped horizontal cross-section to prevent the deposition of solids.
    Type: Grant
    Filed: December 5, 1984
    Date of Patent: February 11, 1986
    Assignee: Krauss-Maffei A.G.
    Inventors: Erhard Aufderharr, Ernst Gruebl, Siegfried Pfaff