Patents by Inventor Roger Davison

Roger Davison 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).

  • Slow sand filters
    Patent number: 4911831
    Abstract: The invention relates to an apparatus for cleaning a slow sand filter for a body of liquid while the liquid is in situ, in which there is a carrier adapted to traverse the body of liquid, and a device carried by the carrier and adapted to skim successive layers of sand from the filter. The carrier is a floatable vessel and the skimmer device is an auger. The skimmer device is controlled by depth control means which are automatically adjusted in response to the contour of the filter.
    Type: Grant
    Filed: September 28, 1988
    Date of Patent: March 27, 1990
    Assignee: Thames Water Authority
    Inventors: Roger Davison, Michael J. Bauer