Patents by Inventor Per-Axel Carsten Ronne

Per-Axel Carsten Ronne 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).

  • Drill boom with hydraulic parallel motion means
    Patent number: 4037671
    Abstract: In a drill boom pivotally supporting a rock drilling apparatus, hydraulic parallel motion means is provided which includes a hydraulic pilot cylinder for sensing the setting of the elevation angle of the drill boom. During elevating of the drill boom the hydraulic pilot cylinder is furthermore used as an additional elevating cylinder.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: July 26, 1977
    Assignee: Atlas Copco Aktiebolag
    Inventors: Erich Voldemar Kimber, Per-Axel Carsten Ronne