Patents by Inventor Raj P. Singh Gaur

Raj P. Singh Gaur 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).

  • Tantalum concentrates dissolution and purification method
    Patent number: 7182925
    Abstract: A method for the dissolution and purification of tantalum ore and synthetic concentrates is described. The method preferably uses ammonium bifluoride as the fluoride source in place of the hydrofluoric acid used in the conventional methods. Other fluoride compounds such as NaF, KF, and CaF2 may be used alone or in combination with ammonium bifluoride. The tantalum concentrate and fluoride source are combined with sulfuric acid to form a solution containing tantalum values and impurities. The tantalum values are then separated from the impurities by solvent extraction.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: February 27, 2007
    Assignee: Osram Sylvania Inc.
    Inventors: Raj P. Singh Gaur, Robert G. Mendenhall
  • Tantalum Concentrates Dissolution and Purification Method
    Publication number: 20040213716
    Abstract: A method for the dissolution and purification of tantalum ore and synthetic concentrates is described. The method preferably uses ammonium bifluoride as the fluoride source in place of the hydrofluoric acid used in the conventional methods. Other fluoride compounds such as NaF, KF, and CaF2 may be used alone or in combination with ammonium bifluoride. The tantalum concentrate and fluoride source are combined with sulfuric acid to form a solution containing tantalum values and impurities. The tantalum values are then separated from the impurities by solvent extraction.
    Type: Application
    Filed: April 22, 2004
    Publication date: October 28, 2004
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Raj P. Singh Gaur, Robert G. Mendenhall