Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Rolling or rotatable bit
Reexamination Certificate
2007-10-12
2008-08-19
Kreck, John (Department: 3672)
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Rolling or rotatable bit
Reexamination Certificate
active
07413258
ABSTRACT:
In one aspect of the invention, a degradation pick comprises a bolster disposed intermediate a shank and an impact tip. The shank comprises an outer diameter and first and second ends. The shank is coupled to the bolster through the first end and the second end is adapted for insertion into a central bore of a holder attached to a driving mechanism. The shank comprises a hollow portion disposed within the outer diameter and between the first and second ends. The hollow portion may comprise an opening that is disposed in the second end. In some embodiments the hollow portion may comprise a length that is at least as great as the outer diameter.
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Crockett Ronald
Dahlgren Scott
Hall David R.
Jepson Jeff
Kreck John
Wilde Tyson J.
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