Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2007-06-22
2009-08-11
Gay, Jennifer H (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C175S425000
Reexamination Certificate
active
07571782
ABSTRACT:
In one aspect of the invention, a drill bit comprises a steel body disposed intermediate a threaded end and a working face. The steel body comprises a plurality of steel blades disposed along an outer diameter of the body and extending radially away from an axis of rotation of the bit. A plurality of cutter elements is disposed on the plurality of steel blades and the blades each comprise a steel stiffness and a steel elastic modulus. At least one of the plurality of steel blades comprises a stiffening element and an overall stiffness at least 3.5 times greater than the steel stiffness.
REFERENCES:
patent: 4109737 (1978-08-01), Bovenkerk
patent: 4499958 (1985-02-01), Radtke et al.
patent: 5101692 (1992-04-01), Simpson
patent: 5333699 (1994-08-01), Thigpen et al.
patent: 5435403 (1995-07-01), Tibbitts
patent: 5441121 (1995-08-01), Tibbitts
patent: 5449048 (1995-09-01), Thigpen
patent: 5558170 (1996-09-01), Thigpen
patent: 5560440 (1996-10-01), Tibbitts
patent: 5848657 (1998-12-01), Flood
patent: 6021859 (2000-02-01), Tibbitts
patent: 6302224 (2001-10-01), Sherwood
patent: 6332503 (2001-12-01), Pessier
patent: 6408958 (2002-06-01), Isbell et al.
patent: 6408959 (2002-06-01), Bertagnolli
patent: 6484826 (2002-11-01), Anderson
patent: 6651756 (2003-11-01), Costo et al.
patent: 6672406 (2004-01-01), Beuershausen
patent: 7070011 (2006-07-01), Sherwood
patent: 7216565 (2007-05-01), Sherwood
patent: 2001/0004946 (2001-06-01), Jensen
patent: 2005/0103533 (2005-05-01), Sherwood et al.
patent: 2007/0251732 (2007-11-01), Mirchandani et al.
Bailey John
Hall David R.
Gay Jennifer H
Gottlieb Elizabeth C
Mills Jad A.
Wilde Tyson J.
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