Patents by Inventor Einar Walli

Einar Walli 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).

  • Recovery of nickel and cobalt from leach slurries
    Patent number: 4280988
    Abstract: A slurry, such as might be obtained from acid leaching nickeliferous ores having a high iron content, is treated to separate dissolved nickel or cobalt from iron oxide solids. The treatment involves a controlled precipitation of the non-ferrous metal with the aid of calcium sulfide or barium sulfide followed by flotation to recover a high grade concentrate of the non-ferrous metal.
    Type: Grant
    Filed: April 4, 1980
    Date of Patent: July 28, 1981
    Assignee: The International Nickel Co., Inc.
    Inventors: Kohur N. Subramanian, Gerald V. Glaum, Einar Walli