Patents by Inventor Norman J. Lewis

Norman J. Lewis 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).

  • Method for the depressing of hydrous, layered silicates
    Patent number: 4853114
    Abstract: A process for the recovery of mineral values from base metal ores is disclosed. Specifically, a froth flotation process is disclosed which comprises contacting an aqueous ore slurry with an effective amount of hemicellulose, a mineral collector and a frothing agent.
    Type: Grant
    Filed: March 3, 1989
    Date of Patent: August 1, 1989
    Assignee: American Cyanamid Copany
    Inventors: Norman J. Lewis, Hans P. Panzer