Patents by Inventor Pertti V. O. Koivistoinen

Pertti V. O. Koivistoinen 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 machine
    Patent number: 5039400
    Abstract: The invention relates to a flotation machine for flotating minerals and the like from slurries containing these particles. In the flotation machine of the invention, above the feed opening (15) of the flotation cell there is formed a froth bed (11) which is adjustable in volume and/or surface area. The regulating and washing members (10, 13) of the froth bed are arranged within the froth bed (11), and the height of the froth bed is 20-40%, advantageously 30-35% of the height of the flotation cell (1).
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: August 13, 1991
    Assignee: Outokumpu Oy
    Inventors: Jouko O. Kallioinen, Pertti V. O. Koivistoinen, Seppo O. Rantanen