Patents by Inventor Berthold A. Fehn

Berthold A. Fehn 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).

  • Sludge Pump
    Patent number: 5507624
    Abstract: The present invention is a sludge pump system which includes a means for monitoring operation of a sludge pump. The sludge pump includes a material cylinder and a piston moveable in the material cylinder. A pump drive moves the piston during working cycles which include a pumping stroke and a filling stroke. A pump valve mechanism connects the material cylinder to an outlet during pumping strokes and connects the material cylinder to an inlet during filling strokes. A means for monitoring operation of the pump is provided. The means for monitoring includes a means for sensing a first parameter related to operation of the pump drive, a means for sensing a second parameter indicative of operation of the piston, and a means for determining errors in the operation of the pump based upon the first parameter and the second parameter.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: April 16, 1996
    Assignee: Friedrich Wilhelm Schwing GmbH
    Inventor: Berthold A. Fehn
  • Sludge flow measuring system
    Patent number: 5346368
    Abstract: A system for the transport of high solids sludge includes a positive displacement pump for pumping sludge through a pipeline. The volume of sludge transported is accurately measured by determining the fill percentage during pumping cycle.
    Type: Grant
    Filed: October 1, 1993
    Date of Patent: September 13, 1994
    Assignee: Schwing America, Inc.
    Inventors: Edward A. Oakley, Harry K. Crow, Thomas M. Anderson, Richard T. Atherton, Berthold A. Fehn
  • Sludge flow measuring system
    Patent number: 5257912
    Abstract: A system for the transport of high solids sludge includes a positive displacement pump for pumping sludge through a pipeline. The volume of sludge transported is accurately measured by determining the fill percentage during pumping cycle.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: November 2, 1993
    Assignee: Schwing America, Inc.
    Inventors: Edward A. Oakley, Harry K. Crow, Thomas M. Anderson, Richard T. Atherton, Berthold A. Fehn
  • Sludge flow measuring system
    Patent number: 5106272
    Abstract: A system for the transport of high solids sludge includes a positive displacement pump for pumping sludge through a pipeline. The volume of sludge transported is accurately measured by determining the fill percentage by using a material flow signal, measured time intervals, hydraulic fluid pressure, or hydraulic fluid flow rate during each pumping cycle.
    Type: Grant
    Filed: October 10, 1990
    Date of Patent: April 21, 1992
    Assignee: Schwing America, Inc.
    Inventors: Edward A. Oakley, Harry K. Crow, Thomas M. Anderson, Richard T. Atherton, Berthold A. Fehn
  • Apparatus for installing and removing the drive assembly in chain driven-vehicles
    Patent number: 3966061
    Abstract: A system for the removal and replacement of the drive assembly of a chain-driven vehicle, composed of guides within the vehicle, a device for lifting the drive assembly onto the guides and including rollers via which the drive assembly is supported on the guides when lifted thereon, an auxiliary rack temporarily attachable to the rear of the vehicle to form a rearwardly-projecting extension of the guides on which the rollers can travel, and a device for moving the drive assembly through an opening in the rear of the vehicle and over the auxiliary track.
    Type: Grant
    Filed: January 30, 1975
    Date of Patent: June 29, 1976
    Assignee: Gesellschaft fur Systemtechnik mbH
    Inventors: Berthold Fehn, Oskar Simon
  • Sludge flow measuring system
    Patent number: RE35473
    Abstract: A system for the transport of high solids sludge includes a positive displacement pump for pumping sludge through a pipeline. The volume of sludge transported is accurately measured by determining the fill percentage by using a material flow signal, measured time intervals, hydraulic fluid pressure, or hydraulic fluid flow rate during each pumping cycle.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: March 11, 1997
    Assignee: Schwing America, Inc.
    Inventors: Edward A. Oakley, Harry K. Crow, Thomas M. Anderson, Richard T. Atherton, Berthold A. Fehn