Patents by Inventor Roger Sandström

Roger Sandström 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).

  • Thread coupling for a drill string for percussive rock drilling
    Patent number: 6810956
    Abstract: A thread coupling for a drill string for percussive drilling has a male thread (5) and a cooperating female thread (4). The male thread is arranged on a first drill string element (3) having a first impact surface (6). The female thread is arranged on a second drill string element (2) having a second impact surface (7). The male and female threads are conical, and the crests (8) of the male thread (5) have a radius of curvature more than thirty degrees of the pitch of the thread.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: November 2, 2004
    Assignee: Uniroc AB
    Inventor: Roger Sandström