Patents by Inventor Alfred Pohlen

Alfred Pohlen 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).

  • Patent number: 6210526
    Abstract: The invention relates to a method for inhibiting and eliminating adhesive impurities, so-called stickies, from waste paper preparations or paper pulp containing prepared waste paper in the paper industry by using classic sorting- and dispersion equipment and a flotation unit consisting of one or more flotation stages containing deinking froth. In the course of preparing the waste paper for making a paper pulp which is fed to a paper machine, a hydrophobized synthetic or natural mineral is added to the pulp before or during its introduction into the paper machine, causing the microstickies to be adsorbed by the added hydrophobized mineral and removed by same from the flotation unit via the deinking froth.
    Type: Grant
    Filed: August 24, 1999
    Date of Patent: April 3, 2001
    Inventor: Alfred Pohlen