Patents by Inventor David H. Hume

David H. Hume 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).

  • Sand washing
    Patent number: 5392924
    Abstract: There is disclosed a process and plant for cleaning unwashed clay/sand or oil sands in which a vessel having a false floor of permeable material contains a column of liquid and sand to be cleaned in which an air and liquid mix is injected through the permeable material at a controlled pressure so that the air, water and sand clay mixture will mix together to fluidise the sand with the presence of small bubbles of air to create a turbulence and abrasion of the particles and to clean the sand.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: February 28, 1995
    Assignee: Little River Pastoral Co. Pty. Ltd.
    Inventor: David H. Hume