Patents by Inventor Rudolf Ryf

Rudolf Ryf 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).

  • Device for engraving intaglio printing cylinders
    Patent number: 4830552
    Abstract: A device for engraving intaglio printing cylinders is provided having the engraving needle cutting the small screen cups in the intaglio printing cylinder and the scanning element applied to the cylinder jointly supported in a holding device. The scanning element is engaged by a damping element having a piston supported on a pressure spring and guided in a cylindrical casing. A tappet is connected to the piston and engages the scanning element or a handwheel mounted on such element. Motions of the scanning element in the direction of its longitudinal axis are damped by the damping element thereby eliminating undesirable vibrations of the holding device and thus of the engraving needle.
    Type: Grant
    Filed: October 1, 1987
    Date of Patent: May 16, 1989
    Assignee: MDC Max Datwyler Bleienbach AG
    Inventor: Rudolf Ryf