Patents by Inventor Keith D. Gibbs

Keith D. Gibbs 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).

  • Biopolymer use as a sand filter aid
    Patent number: 5716530
    Abstract: In the Bayer process for producing alumina from bauxite of the type wherein the bauxite is added to a caustic solution to produce a soluble aluminate solution and an insoluble red mud fraction which is then subjected to one or more separation steps to produce a thickener overflow which is then subjected to a Sand Filter to polish the thickener overflow the improvement which comprises treating the thickener overflow with a solids removal efficiency improving amount of a biopolymer.
    Type: Grant
    Filed: December 13, 1996
    Date of Patent: February 10, 1998
    Assignee: Nalco Chemical Company
    Inventors: Michael G. Strominger, Keith D. Gibbs