Patents by Inventor Dietrich Liechti

Dietrich Liechti 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).

  • Flotation process
    Patent number: 5074993
    Abstract: A method of flotation of sulfides wherein pyrrhotite is depressed by use of a water-soluble polyamine while non-ferrous metal-containing sulfide or sulfidized minerals are floated selectively.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: December 24, 1991
    Assignee: Inco Limited
    Inventors: Andrew N. Kerr, Dietrich Liechti, Maria A. Marticorena, Daniel A. Pelland