Patents by Inventor Elizabeth A. Crathorne

Elizabeth A. Crathorne 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).

  • Prevention of copper dissolution during cyanidation of gold ores
    Patent number: 5061459
    Abstract: A process for treating copper containing precious metal ores prior to cyanidation and recovery of the precious metal eg gold. The process involves addition to the ore before or after milling of a water soluble or water dispersible surface active agent in the form of a fatty alkyl amine preferably an ethoxylated fatty alkyl amine. The agent reduces the high cyanide consumption, which is caused by copper dissolution, by passivating the mineral surface.
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: October 29, 1991
    Assignee: The British Petroleum Company p.l.c.
    Inventors: Charles A. Bennett, Elizabeth A. Crathorne, Raymond Edwards