Patents by Inventor Leonard P. Hendriks

Leonard P. Hendriks 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).

  • Leaching refractory gold ores
    Patent number: 4559209
    Abstract: A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.
    Type: Grant
    Filed: September 6, 1983
    Date of Patent: December 17, 1985
    Assignee: Johannesburg Consolidated Investment Company Limited
    Inventors: Colin W. A. Muir, Leonard P. Hendriks