Patents by Inventor Bert Bergstrom

Bert Bergstrom 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).

  • Tubular drill tool
    Patent number: 4212569
    Abstract: The drill tool of the present invention comprises a profiled tubular drill shank with a drill head, which consists of the free part of the drill shank with guide strips and cutting element fastened to it, characterized in that the cutting element (3) is fixed in a position pressed or forged into the drill shank (1).
    Type: Grant
    Filed: October 6, 1977
    Date of Patent: July 15, 1980
    Assignee: Sandvik Aktiebolag
    Inventors: Allan Andersson, Bert Bergstrom