Patents by Inventor Bjorn K.ang.reby

Bjorn K.ang.reby 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).

  • Tubeformed rock bolt
    Patent number: 5765969
    Abstract: A tubeformed rock bolt having a closed cross section includes a tube (11) provided with a longitudinal depression (12). First and second sleeves are provided at the ends of the tube, and the sleeves are welded to the tube so that a closed compartment is formed. The second sleeve has a radial groove for providing a desired angular position to the rock bolt and a tool used for setting the bolt, and a first hole for injection of cement. The tube is additionally provided with a second hole near a first end for venting the closed compartment.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: June 16, 1998
    Assignee: Atlas Copco Rock Drill AB
    Inventors: Bjorn K.ang.reby, Anita Mandal