Patents by Inventor Robert D. Lear

Robert D. Lear 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).

  • Processes for removing cyanide from mill tailings
    Patent number: 5169615
    Abstract: Mill tailings containing cyanide species can be treated with carbon dioxide in order to drive-off and/or recover the cyanide content of said tailings.
    Type: Grant
    Filed: October 30, 1990
    Date of Patent: December 8, 1992
    Inventors: Melvin A. Jennings, Robert D. Lear