Patents by Inventor Robert Pennell Williams

Robert Pennell Williams 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).

  • ARCHIMEDES SCREW ASSEMBLY
    Publication number: 20130134703
    Abstract: An Archimedes screw assembly comprising a plurality of helically curved tubular components (10) mounted together end to end, and for instance in three sets, to define a three start helix.
    Type: Application
    Filed: April 14, 2011
    Publication date: May 30, 2013
    Applicant: THE ARCHIMEDES SCREW COMPANY LIMITED
    Inventor: Robert Pennell Williams