Patents by Inventor Bruno Michelewski

Bruno Michelewski 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 removing fine contaminants from used paper fibre material
    Patent number: 5417806
    Abstract: A method of removing fine contaminants from waste paper fibrous material (S) is described with solution (1) and pre cleaning (2) whereupon the fibrous material is first subjected to a washing treatment (3) and then to a flotation treatment (5). The washing filtrate (12) from the washing treatment (3) is cleaned in a filtrate-flotation treatment (4) so that a cleaned fraction (14) can be returned into the useful material (13) of the washing treatment. The so cleaned waste paper fibrous material can be passed to further treatment steps such as flotation, bleaching and/or dispersion. The reject material from the filtrate-flotation (4) is, in one embodiment, again subjected to a flotation treatment.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: May 23, 1995
    Assignee: Sulzer-Escher Wyss GmbH
    Inventors: Wolfgang Matzke, Bruno Michelewski