Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2008-07-01
2008-07-01
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C175S425000, C175S421000, C405S259100
Reexamination Certificate
active
11553063
ABSTRACT:
The invention is embodied in a heavy duty drill bit for hard/soft rock drilling comprising a high fatigue-resistant, high alloy steel bit body having a PCD cutter member and an enlarged shank portion constructed to accommodate torsional forces at high thrust pressures, and reamer means for compensating the effect of bore hole rifling. The invention further involves the method of forming a roof bolting matrix in extremely hard rock formations having a compression strength up to about 50,000 psi using PCD wafers on a high tensile strength steel body coupled by a heavy duty shank through high fatigue-resistant reamer means to a high strength drive steel member.
REFERENCES:
patent: 3163246 (1964-12-01), Vagins
patent: 5180022 (1993-01-01), Brady
patent: D340248 (1993-10-01), Brady
patent: 5303787 (1994-04-01), Brady
patent: D351174 (1994-10-01), Brady
patent: 5383526 (1995-01-01), Brady
patent: 5429199 (1995-07-01), Sheirer
patent: 5988301 (1999-11-01), Lundell
patent: 6044920 (2000-04-01), Massa
patent: D424579 (2000-05-01), Brady
patent: 6092612 (2000-07-01), Brady
patent: D430578 (2000-09-01), Brady
patent: 6161635 (2000-12-01), Brady
patent: 6374932 (2002-04-01), Brady
patent: D514131 (2006-01-01), Brady
patent: 2007/0119624 (2007-05-01), Brady
Holland & Hart
The William Brady Loving Trust
Thompson Kenneth
LandOfFree
Roof drilling system improvements does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Roof drilling system improvements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Roof drilling system improvements will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3921523