Jack element with a stop-off

Details Jack element with a stop-off Jack element with a stop-off

2007-05-18

2009-06-23

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

C175S426000

Reexamination Certificate

active

07549489

ABSTRACT:
In one aspect of the present invention, a drill bit has a body intermediate a shank and a working face, the working face comprising a plurality of blades formed on the working face and extending outwardly from the bit body. Each blade comprises at least one cutting element. The drill bit also has a jack element coaxial with an axis of rotation and extending out of an opening formed in the working face. A portion of the jack element is coated with a stop-off.

REFERENCES:
patent: 4535853 (1985-08-01), Ippolito et al.
patent: 4683781 (1987-08-01), Kar et al.
patent: 4907665 (1990-03-01), Kar et al.
patent: 5732784 (1998-03-01), Nelson
patent: 5794728 (1998-08-01), Palmberg
patent: 5833021 (1998-11-01), Mensa-Wilmot et al.
patent: 6131675 (2000-10-01), Anderson
patent: 6454030 (2002-09-01), Findley et al.

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