Patents by Inventor Harry K. Crow

Harry K. Crow 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).

  • System and method for controlling a materials handling system
    Patent number: 5839883
    Abstract: A system and method is provided for controlling a materials handling system. The materials handling system preferably includes a feed system, a positive displacement pump and a disposal system. The feed system includes a material feeder, which in the preferred embodiment is a screw feeder driven by a drive, and a transition housing. The material feeder forces material through the transition housing to an inlet of the positive displacement pump. The control system includes a pressure sensor, located on the transition housing, connected to a computer. The computer is also connected to the drive of the screw feeder. During operation of the materials handling system, the pressure sensor senses a parameter indicative of material pressure within the transition housing and sends a signal to the computer representative of this parameter. The computer provides a control signal to the feed system to control operation of the materials handling system as a function of the sensed parameter.
    Type: Grant
    Filed: May 22, 1996
    Date of Patent: November 24, 1998
    Assignee: Schwing America, Inc.
    Inventors: Lawrence P. Schmidt, Harry K. Crow
  • 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
  • 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