Patents by Inventor Nils Gustav Bergstrom

Nils Gustav 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).

  • Method of treating surgical drill, surgical drill and use of surgical drill
    Patent number: 5785522
    Abstract: The invention relates to a surgical drill made of metal, for instance made of surgical grade stainless steel or carbon steel, intended for use when implanting cylindrical implants into bone tissue, preferably dental implants made of titanium. The body (3) of the drill (1) is coated by a thin layer of titanium nitride (TiN). The layer of titanium nitride is brightly colored and circumferential bands (8, 9, 10, 11) having a darker color have been etched around the envelope surface of the body (3) of the drill, said bands (8, 9, 10, 11) being located at predetermined distances from each other and having predetermined widths.
    Type: Grant
    Filed: February 7, 1995
    Date of Patent: July 28, 1998
    Assignee: Astra Aktiebolag
    Inventors: Nils Gustav Bergstrom, Anders Holmen
  • Healing abutment for a dental implant
    Patent number: D414556
    Type: Grant
    Filed: July 12, 1995
    Date of Patent: September 28, 1999
    Assignee: Astra Aktiebolag
    Inventors: Leif Broberg, Anders Holmen, Nils Gustav Bergstrom