Patents by Inventor Pertti K. Hynninen

Pertti K. Hynninen 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 treatment of the circulation water of a paper mill
    Patent number: 4761238
    Abstract: A method for removing dissolved and colloidal material from the circulation water of a paper mill with chemical pulp fibers wherein fiber sludge which has been recovered from the paper manufacturing process and acidified to a pH of 1.5-2.5, is mixed with the circulation water of a paper mill whereby the dissolved and colloidal substances are precipitated.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: August 2, 1988
    Assignee: Kamyr AB
    Inventor: Pertti K. Hynninen