Patents by Inventor Steven J. Abbatello

Steven J. Abbatello 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).

  • Use of dextran as a filtration aid for thickener overflow filtration in Kelly filters in the Bayer process
    Patent number: 5091159
    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 Kelly Filter Press to polish the thickener overflow the improvement which comprises treating the thickener overflow and the filter aid with a filtration improving amount of dextran.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: February 25, 1992
    Assignee: Nalco Chemical Company
    Inventors: Lawrence J. Connelly, Steven J. Abbatello, David C. Davis, David A. Undlin