Patents by Inventor Ernst Lennart Johansson

Ernst Lennart Johansson 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).

  • Percussion drill rod
    Patent number: 4094364
    Abstract: In the percussion drill rod assembly of the present invention rotary force is transmitted through a tubular member of the assembly while impact force is transmitted through the rod member centrally located in the tubular member. Either of said rod and tubular members is provided with radially extending protrusions which guide said member with respect to the other member while enabling flushing medium to pass between said members.
    Type: Grant
    Filed: June 25, 1974
    Date of Patent: June 13, 1978
    Assignee: Sandvik Aktiebolag
    Inventors: Hans Per Olof Lundstrom, Ernst Lennart Johansson
  • Coupling means in a drilling machine
    Patent number: 3981368
    Abstract: A drilling machine may include extension equipment comprising (a) drill rods -- connected end-to-end -- for transmission of impact force and (b) a system of tubular members -- likewise connected end-to-end -- surrounding said rods, for transmission of rotary force. Such extension equipment may be coupled to the machine per se by means of a tubular adapter threadably connected, at one of its ends, to the tubular members system and at its opposite end connected to the machine through polygonal coupling means.
    Type: Grant
    Filed: December 31, 1974
    Date of Patent: September 21, 1976
    Assignee: Sandvik Aktiebolag
    Inventors: Hans Per Olof Lundstrom, Ernst Lennart Johansson