Patents by Inventor Ludwig Fabel

Ludwig Fabel 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).

  • Seal arrangement for an oil-sealed rotary vacuum pump
    Patent number: 4652214
    Abstract: An oil-sealed rotary vacuum pump includes a pump system and an electric drive motor connected by a drive shaft and located within a housing. The housing is divided by a partition into two separate compartments with the pump system in one compartment and the drive motor in the other compartment. The drive shaft extends through a passage in the partition between the two compartments and the passage is arranged so that any leakage flow is directed from the motor compartment into the pump system compartment.
    Type: Grant
    Filed: February 23, 1985
    Date of Patent: March 24, 1987
    Assignee: Arthur Pfeifer Vakuummtechnik Wetzlar GmbH
    Inventor: Ludwig Fabel
  • Two stage rotary vane pump
    Patent number: 4508494
    Abstract: An arrangement for transmitting torque between the two rotors of a two stage rotary vane pump, consists of a coupling element, which forms between engagements on opposing faces of the two rotors, a connection which permits two degrees of freedom between the two rotors in the plane perpendicular to the rotor axis.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: April 2, 1985
    Assignee: Arthur Pfeiffer Vakuumtechnik Wetzlar GmbH
    Inventors: Erich Bachmann, Ludwig Fabel, Roland Fischer, Werner Peter, Bernd Scheiter, Werner Wenzel