Patents by Inventor Bernard J. Kerley, Jr.

Bernard J. Kerley, Jr. 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).

  • Recovery of precious metals from difficult ores
    Patent number: 4369061
    Abstract: Precious metals such as gold and silver are recovered from difficult-to-treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.0, and at least 0.05% sulfite ion, sulfite and thiosulfate requirements being maintained by the reaction in situ of sulfur dioxide and elemental sulfur.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: January 18, 1983
    Inventor: Bernard J. Kerley, Jr.
  • Recovery of precious metals from difficult ores
    Patent number: 4269622
    Abstract: Precious metals such as gold and silver are recovered from difficult-to-treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.5, and at least 0.05% sulfite ion.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: May 26, 1981
    Inventor: Bernard J. Kerley, Jr.