Boring or penetrating the earth – Processes
Reexamination Certificate
2006-06-20
2006-06-20
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Processes
C175S107000, C175S320000
Reexamination Certificate
active
07063175
ABSTRACT:
A retaining apparatus is provided for preventing the separation and loss of a down-hole drive motor and associated drill bit from the drill string due to gyroscopic precession of the motor housing resulting from counter torque produced by the drill bit. The retaining apparatus includes a collet, an expander with interchangeable nozzles and a fluid bypass flange.
REFERENCES:
patent: 2167019 (1939-07-01), Yost
patent: 3047079 (1962-07-01), Wepsala, Jr.
patent: 3077937 (1963-02-01), Tiraspolsky et al.
patent: 3159222 (1964-12-01), Hammer et al.
patent: 4260030 (1981-04-01), Fox
patent: 5165492 (1992-11-01), Beasley
patent: 6540020 (2003-04-01), Falgout, Sr.
patent: 2002/0166700 (2002-11-01), Gillis et al.
Dang Hoang
Montgomery Robert N.
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