Patents by Inventor Michael Preuschoff

Michael Preuschoff 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).

  • Mineral mining installation
    Patent number: 4639169
    Abstract: A mineral mining installation comprises a roof support unit and an advance mechanism. The roof support unit has a floor sill constituted by two floor girders. The advance mechanism comprises a hydraulic advance ram, the advance ram having a relatively-displaceable cylinder and a piston rod, and a device for selectively limiting the working stroke of the ram. The stroke-limiting device comprises a stop fixed to the cylinder of the advance ram, and an adjustable stop member which is mounted on the side wall of one of the floor girders.
    Type: Grant
    Filed: January 30, 1985
    Date of Patent: January 27, 1987
    Assignee: Gewerkschaft Eisenhutte Westfalia
    Inventors: Kunibert Becker, Rudiger Kirchbrucher, Michael Preuschoff