Patents by Inventor Rudolph M. Coetzee

Rudolph M. Coetzee 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).

  • Backfill, methods of making, and use thereof
    Patent number: 9573849
    Abstract: A composition in the form of a backfill is described. The composition comprises one or more mine tailings present in an amount greater than 50% by weight of the composition, one or more cementitious binder materials present in an amount ranging from 0% to 12% by weight of the composition, attapulgite present in an amount ranging from 0.01% to 4.00% by weight of the composition, and water. The fines content (Fc) of the one or more mine tailings is greater than or equal to 3%. Although subject to many uses, in some embodiments, the composition is suitable for managing tailings to be stored above ground or underground. For example, in some embodiments, the composition is suitable for filling mined out areas.
    Type: Grant
    Filed: April 30, 2014
    Date of Patent: February 21, 2017
    Assignee: ACTIVE MINERALS INTERNATIONAL, LLC
    Inventors: Robert J. Purcell, Jr., Dennis C. Parker, Paul Fendley, Rudolph M. Coetzee, Steven B. Feldman