Patents by Inventor Karl-Josef Memmel

Karl-Josef Memmel 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 of pressure leaching
    Patent number: 4472359
    Abstract: A process of leaching ores, ore concentrates, intermediate metallurgical products and the like, which contain acid-soluble constituents, by a treatment in an acid aqueous solution under pressure in a tubular reactor. The slurry contains suitably 300 to 1100 g starting material per liter of water and a velocity of flow of 0.5 to 4.0 m/sec. is suitably maintained throughout the flow path in the tubular reactor of the slurry and of the leached suspension.
    Type: Grant
    Filed: February 23, 1982
    Date of Patent: September 18, 1984
    Assignees: Metallgesellschaft AG, Vereinigte Aluminium-Werke AG
    Inventors: Hartmut Pietsch, Wolfgang Turke, Hubert Bings, Karl-Josef Memmel