Patents by Inventor Johan Doppstadt

Johan Doppstadt 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: 8939292
    Abstract: The invention refers to a screening machine, in particular a star screening machine, comprising at least two driven shafts provided with stars and/or discs, the shafts being arranged in a screening plane parallel spaced to each other, wherein the stars and/or discs are provided on different shafts staggered or comb-like engaging with each other, with a hopper or filling area in which the material to be screened can be filled. Wherein on the side facing the filling area in a plane above the screening plane and spaced parallel from it two distribution devices are provided one after the other in the direction of screening or conveying for distributing the material to be screened on the screening plane.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: January 27, 2015
    Assignee: Doppstadt Familienholding GmbH
    Inventors: Johan Doppstadt, Horst Berger
  • Publication number: 20120228198
    Abstract: The invention refers to a screening machine, in particular a star screening machine, comprising at least two driven shafts provided with stars and/or discs, the shafts being arranged in a screening plane parallel spaced to each other, wherein the stars and/or discs are provided on different shafts staggered or comb-like engaging with each other, with a hopper or filling area in which the material to be screened can be filled. The invention is characterized in that on the side facing the filling area in a plane above the screening plane and spaced parallel from it two distribution devices are provided one after the other in the direction of screening or conveying for distributing the material to be screened on the screening plane.
    Type: Application
    Filed: April 16, 2010
    Publication date: September 13, 2012
    Inventors: Johan Doppstadt, Horst Berger