Patents by Inventor Horst Kriefall

Horst Kriefall 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).

  • Apparatus for stacking sheets
    Patent number: 4824092
    Abstract: The sailing and floating of the sheets which has occurred uncontrollably at certain speeds is avoided so that an exact stacking is permitted at high speeds. The vacuum conveyor is a vacuum belt conveyor whose vacuum box with circulating vacuum belts extends over the entire stacking location and the brake device. The brake device comprises an upper circulating belt supported by a vacuum chamber whose upper strand reaches up to the stacking location. Thus the sheets during the stacking process are guided precisely and do not float freely.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: April 25, 1989
    Assignee: Babcock-Bsh Aktiengesellschaft
    Inventors: Horst Kriefall, Helmut Rohrbach, Siegfried Fischer