Patents by Inventor Charles W. Fergusson

Charles W. Fergusson 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).

  • Automatic backwashing filter
    Patent number: 4673498
    Abstract: A filter has a hollow tube (5) which supports exteriorly of the tube (95) a plurality of filter compartments (11). The filter compartments (11) comprise particulate filter media (12) confined between first and second screens (14, 13). Disposed within the tube (5) is a rotatable backwash pipe 8 having backwash ducts (9) which align in turn with holes (7) in the tube (5) leading to the compartments to permit backwashing of the compartments (11). In the preferred arrangement secondary backwash flow is provided between the first and second screens (14, 13).
    Type: Grant
    Filed: October 2, 1985
    Date of Patent: June 16, 1987
    Assignee: Swinney Engineering Limited
    Inventors: Denis P. Swinney, Norman Twizell, Charles W. Fergusson