Patents by Inventor Wolfgang Leutzendorff

Wolfgang Leutzendorff 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).

  • Process and a plant for separating low density material from substrate mixtures
    Patent number: 4849116
    Abstract: The invention relates to a process and a plant for separating low density material, in particular plastics, in particular with a density of less than 1, from substrate mixtures, preferably from waste material fractions or presorted garbage fractions optionally containing essential portions of plastics or optionally presorted to paper/plastics fractions, wherein a gravity separation, in particular a sink-float separation, is carried out and the low density material phase, in particular polyolefin plastics, is withdrawn and optionally further processed as a separate fraction after drying.According to the invention, the separating effect and the cleaning of the low density material phase withdrawn are increased by carrying out at least one centrifugal separation, preferably in a hydrocyclone, in addition to at least one gravity separation, preferably in a sink-float basin.
    Type: Grant
    Filed: May 27, 1987
    Date of Patent: July 18, 1989
    Assignee: Maschinenfabrik Andritz Actiengesellschaft
    Inventors: Alfred Weinmann, Josef Steinegger, Peter Scheucher, Roland Konstantiniuk, Wolfgang Leutzendorff, Hubert Hermann