Patents by Inventor Ingvar Carlvik

Ingvar Carlvik 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).

  • Drill rod for percussion drilling
    Patent number: 3971447
    Abstract: Drill rod for percussion drilling comprising a central rod member and a sleeve member disposed therearound for a major portion of its length. An annular space is provided between said rod and sleeve members, said space being partially filled with one or several elements of noise-suppressing material, said elements when in plural being spaced from each other.
    Type: Grant
    Filed: December 3, 1974
    Date of Patent: July 27, 1976
    Assignees: Sandvik Aktiebolag, Atlas Copco Aktiebolag
    Inventors: Erik Ahlberg, Ingvar Carlvik, Bernt Soren Liljekvist, Anders Carl Gustaf Hagglund