Patents by Inventor Lennart Donse

Lennart Donse 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 string component
    Patent number: 5209311
    Abstract: Drill string component for top hammer drilling comprising a rod (13) surrounded by a tube packet (4,5). The rod is provided with a thickened section (14) for cooperation with a diameter reduction (15) in the tube packet which at upwards drilling is situated below the section (14). Through this flushing liquid is prevented from flowing out of the drill string when the drill string is extended.
    Type: Grant
    Filed: November 4, 1991
    Date of Patent: May 11, 1993
    Assignee: Atlas Copco Construction and Mining Technique AB
    Inventor: Lennart Donse