Patents by Inventor Karl Stjernstrom

Karl Stjernstrom 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).

  • Driver
    Publication number: 20060000645
    Abstract: A driver or dogging element adapted to transfer torsion forces between a rotating outer tube (10) and a drill bit (1) of a down-the-hole hammer, wherein the dogging element (7) is made of a softer material than those parts (3, 4) of the drill bit (1) that co-act with the dogging element (7, 8).
    Type: Application
    Filed: December 10, 2002
    Publication date: January 5, 2006
    Inventors: Karl Stjernstrom, Thomas Greijer
  • Down-the-hole drill hammer
    Publication number: 20050045385
    Abstract: The present invention relates to an arrangement pertaining to down-the-hole hammers in which a driver (7) is adapted to transfer torsion forces between a rotating outer tube (10) and a drill bit (1) of the hammer, wherein the outer tube (10) surrounds all of the driver (7).
    Type: Application
    Filed: December 10, 2002
    Publication date: March 3, 2005
    Inventors: Karl Stjernstrom, Thomas Greijer