Patents by Inventor Dennis P. Macrae

Dennis P. Macrae 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).

  • Dewatering and compacting equipment with high pressure pumping arrangement
    Patent number: 5173196
    Abstract: A device for the removal of solids from slurries by continuous compaction in a screen chamber. Pressure of liquid in the chamber causes continuous extrusion of a dewatered solid from an open ended chamber. The walls of the chamber may be constructed from longitudinal wedge bars spaced apart to provide filtering spaces between them. A high pressure pumping arrangement, including a first slurry pump and an auxiliary piston pump, is provided to maintain a high-pressure throughout the chamber to facilitate the continuous extrusion.
    Type: Grant
    Filed: November 17, 1989
    Date of Patent: December 22, 1992
    Inventor: Dennis P. Macrae