Patents by Inventor David Y. Shimano

David Y. Shimano 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).

  • Ferric chloride leach of a metal-sulphide bearing material
    Patent number: 4902344
    Abstract: The present invention relates to an aqueous ferric chloride leach process for the extraction of metal values from a metal-sulphide bearing material, the leach being carried out in the presence of a leaching aid chosen from among salts of diesters of sulphodicarboxylic acids. It, in particular, relates to the enhanced recovery of metal values from complex, metal-sulphide bearing materials such as, for example, fine grained, polymetallic sulphide ores, their concentrates or the like.
    Type: Grant
    Filed: October 27, 1988
    Date of Patent: February 20, 1990
    Assignee: Canadian Patents & Development Ltd.
    Inventors: Bernard H. Lucas, David Y. Shimano