Patents Examined by Rojer J. Schoeppel
  • Drilling tool intended to widen a well
    Patent number: 5341888
    Abstract: The drilling tool (1) intended to widen a drilling well bears a series of helical arms (3) resting at a first end on a first fixed flange (4) so as to be able to turn on themselves by a portion of a turn under the control of a rotating ring (9) driven by an opening mechanism (10) controlled by a variation in the pressure of the drilling fluid, while the other end of the arm (3) slides along a groove (21) provided in a second flange (5).
    Type: Grant
    Filed: August 17, 1992
    Date of Patent: August 30, 1994
    Assignee: Diamant Boart Stratabit S.A.
    Inventor: Rene Deschutter