Patents by Inventor James B. Smitham

James B. Smitham 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).

  • Method of beneficiating coal
    Patent number: 5236089
    Abstract: The separation density of a dense media comprising a slurry of magnetite and water in a cyclone for beneficiating coal containing refuse is maintained within predetermined limits by: (a) measuring the total solids in an overflow of the cyclone; (b) comparing the total solids with a predetermined correlation with separation density; and (c) changing the relative proportions of the feed flow of magnetite and water to the cyclone when the separation density as determined by the correlation is outside the predetermined limits.
    Type: Grant
    Filed: January 29, 1992
    Date of Patent: August 17, 1993
    Assignee: The Broken Hill Proprietary Company Limited
    Inventors: James B. Smitham, Ray Keast-Jones, John F. Ellison, Keith R. S. Horrocks