Patents by Inventor Peter O. J. Davies

Peter O. J. Davies 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).

  • Two stage compound spiral separator and method
    Patent number: 5535892
    Abstract: Coal spiral having a relatively short first stage helix for separating a slurry into clean coal, refuse and middlings splits, and a relatively short second stage helix for recleaning middlings split from the first stage. The first stage has only 3.25 turns, the second stage has only two turns, and a combination separator box and feed box delivers the middlings directly from the first stage to the second. The two helices are aligned coaxially, and are of opposite rotational sense to provide counter-rotation of the middlings in the two stages.
    Type: Grant
    Filed: May 3, 1994
    Date of Patent: July 16, 1996
    Assignee: Krebs Engineers
    Inventors: Robert G. Moorhead, Peter O. J. Davies