Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Reexamination Certificate
2007-03-01
2008-09-02
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Nonsymmetrical bit
C175S385000, C175S415000
Reexamination Certificate
active
07419016
ABSTRACT:
In one aspect of the present invention a drill bit assembly comprises a working portion opposite a shank of the bit. The working portion has a plurality of cutting elements. The drill bit assembly also has a central axis eccentric to its axis of rotation. A jack element protrudes from an opening formed in the working portion and has a distal end that is adapted to contact a formation at the axis of rotation.
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Dahlgren Scott
Hall David R.
Leany Francis
Wilde Tyson J.
Dang Hoang
Wilde Tyson J.
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