Patents by Inventor Julius Schröder-Frerkes

Julius Schröder-Frerkes 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: 7722730
    Abstract: The invention relates to a method and device for heat-sealing windows into folding carton blanks for producing liquid-proof folding cartons having film windows. Pieces of film that are cut to measure are placed on the window openings of the folding carton blanks and the edges of the pieces of film are heat-sealed with the folding carton blanks so as to be liquid-proof using heated pressure segments or heat-sealing dies. The folding carton blanks, together with the pieces of film, are fed to a tail pulley for a transport belt by means of the transport belt and are inserted in the gap between the tail pulley and the transport belt resting thereon. In this gap, the blanks and pieces of film are continuously heat-sealed together by means of at least two heated pressure segments that are disposed on the outer periphery of the tail pulley and push radially from inwards against the transport belt in the area of deflection of the transport belt and thus onto the edges of the pieces of film.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: May 25, 2010
    Inventor: Julius Schröder-Frerkes
  • Patent number: 5169651
    Abstract: A method and apparatus for forming a fold line in a sheet of semi-rigid thermoplastic material including supporting the sheet on cylindrical rollers as the sheet is drawn forwardly along the creasing path through a creasing zone and applying a sequence of heated creasing rollers with each roller penetrating the surface of the sheet an increasing amount and immediately following the creasing by a caliper roller having shoulders for flattening the shoulders in the plastic formed beside the crease.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: December 8, 1992
    Assignee: Heiber & Schroeder GmbH
    Inventors: Wolfgang Heiber, Julius Schroeder-Frerkes