Patents by Inventor Andrea de Castro Sheldon

Andrea de Castro Sheldon 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).

  • Titaniferous ore beneficiation
    Patent number: 7625536
    Abstract: This invention relates to a process for beneficiating a titaniferous ore. The process comprises leaching the titaniferous ore with sulfuric acid to form a leached ore, calcining the leached ore in the presence of oxygen to form a calcined ore, and leaching the calcined ore with sulfuric acid, hydrochloric acid, and/or nitric acid to form a beneficiated ore. The leached ore is not reduced prior to or following calcination.
    Type: Grant
    Filed: October 18, 2005
    Date of Patent: December 1, 2009
    Assignee: Millennium Inorganic Chemicals, Inc.
    Inventors: Earl M. Smith, Jr., Andrea de Castro Sheldon