Patents by Inventor Rudolf W. Kurtz

Rudolf W. Kurtz 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 treating and a disperger for disintegrating wood pulp, especially containing waste paper
    Patent number: 5176793
    Abstract: In a method of treating wood-fibre pulp, particularly pulp which contains recycled paper, the pulp is dewatered and then heated by means of superheated steam under pressure prior to being passed to a disperser (10), in which the pulp is finely divided. The pulp is passed from the dispenser to a plug-outfeed screw (20) withouth separate departure of steam from the system. One end of the screw is closed by means of a valve device (21), so that the pulp carried by the screw will be compated to form a plug which seals the system. The valve device (21) located at one end of the screw (20) is constructed to open when the pressure exerted thereon by the plug exceeds a pre-determined value. The invention also relates to a disperser (10) having a substantially rectangular outlet which is connected to a plug-screw (20) of the above kind.
    Type: Grant
    Filed: February 12, 1991
    Date of Patent: January 5, 1993
    Assignee: Cellwood Machinery AB
    Inventor: Rudolf W. Kurtz