Patents by Inventor Mary A. Fedorchak

Mary A. Fedorchak 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).

  • Patent number: 4808384
    Abstract: A process is disclosed for recovering tungsten, iron, and manganese from tungsten bearing material. The process involves digesting the material in a sufficient amount of sulfuric acid at a temperature of at least about C. for a sufficient time in the presence of coal as a reducing agent to form a digestion solution containing the major portion of the scandium, iron, and manganese and a digestion residue containing the major portion of the tungsten, followed by separating the solution from the residue. The major portion of the scandium can be extracted from the digestion solution with an organic solution consisting essentially of a mixture of tertiary alkyl primary amines which are present in an amount sufficient to extract the major portion of the scandium, and the balance an essentially aromatic solvent. The scandium is stripped from the organic with hydrochloric acid which is then separated from the stripped organic.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: February 28, 1989
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Judith A. Ladd, Martin B. MacInnis, Mary A. Fedorchak
  • Patent number: 4214895
    Abstract: Fine particle size cobalt metal powder is prepared by treating an aqueous solution of a soluble cobaltic ammine halide with a sufficient amount of a soluble metallic hydroxide to form a cobalt containing precipitate. The precipitate is separated from the solution and reduced in a reducing atmosphere to produce metallic cobalt.
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: July 29, 1980
    Assignee: GTE Sylvania Incorporated
    Inventors: Richard G. W. Gingerich, Clarence D. Vanderpool, Mary A. Fedorchak, Joseph E. Ritsko, Michael J. Cheresnowsky