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Class Information
Number: 175/399
Name: Boring or penetrating the earth > Bit or bit element > Nonsymmetrical bit > With bore wall engaging guide
Description: Apparatus in which the bit is provided with means engaging the wall of the bore being formed to position the bit or direct its course.










Patents under this class:
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Patent Number Title Of Patent Date Issued
7730972 Downhole turbine Jun. 8, 2010
7690446 Single cone rock bit having inserts adapted to maintain hole gage during drilling Apr. 6, 2010
7506701 Drill bit assembly for directional drilling Mar. 24, 2009
7419016 Bi-center drill bit Sep. 2, 2008
7401668 Single cone rock bit having inserts adapted to maintain hole gage during drilling Jul. 22, 2008
7100711 Single cone rock bit having inserts adapted to maintain hole gage during drilling Sep. 5, 2006
6926099 Drill out bi-center bit and method for using same Aug. 9, 2005
6920944 Apparatus and method for drilling and reaming a borehole Jul. 26, 2005
6827159 Steerable horizontal subterranean drill bit having an offset drilling fluid seal Dec. 7, 2004
6814168 Steerable horizontal subterranean drill bit having elevated wear protector receptacles Nov. 9, 2004
6810972 Steerable horizontal subterranean drill bit having a one bolt attachment system Nov. 2, 2004
6810971 Steerable horizontal subterranean drill bit Nov. 2, 2004
6810973 Steerable horizontal subterranean drill bit having offset cutting tooth paths Nov. 2, 2004
6739416 Enhanced offset stabilization for eccentric reamers May. 25, 2004
6659207 Bi-centered drill bit having enhanced casing drill-out capability and improved directional stability Dec. 9, 2003
6602028 Support pad for a deep hole drill Aug. 5, 2003
6464024 Bi-centered drill bit having improved drilling stability, mud hydraulics and resistance to cutter damage Oct. 15, 2002
6394200 Drillout bi-center bit May. 28, 2002
6321858 Bit for directional drilling Nov. 27, 2001
6308789 Drill bit for directional drilling Oct. 30, 2001
6298929 Bi-center bit assembly Oct. 9, 2001
6269893 Bi-centered drill bit having improved drilling stability mud hydraulics and resistance to cutter damage Aug. 7, 2001
6213231 Boring tool with rectangular plates Apr. 10, 2001
6209660 Drill bit shear relief for horizontal directional drilling of rock formations Apr. 3, 2001
6206117 Drilling structure with non-axial gage Mar. 27, 2001
6202768 Rock drilling tool and reamer for percussive drilling Mar. 20, 2001
6161636 Boring head and bit protective collar Dec. 19, 2000
6119797 Single cone earth boring bit Sep. 19, 2000
6089336 Rotary drill bits Jul. 18, 2000
5992548 Bi-center bit with oppositely disposed cutting surfaces Nov. 30, 1999
5979576 Anti-whirl drill bit Nov. 9, 1999
5967246 Rotary drill bits Oct. 19, 1999
5957223 Bi-center drill bit with enhanced stabilizing features Sep. 28, 1999
5873422 Anti-whirl drill bit Feb. 23, 1999
5819860 Rotary drill bits Oct. 13, 1998
5820316 Guide element for a cutting tool Oct. 13, 1998
5402856 Anti-whirl underreamer Apr. 4, 1995
5328304 Reamer Jul. 12, 1994
5199511 Drill bit and method for reducing formation fluid invasion and for improved drilling in plastic formations Apr. 6, 1993
5186268 Rotary drill bits Feb. 16, 1993
5165494 Rotary drills bits Nov. 24, 1992
5131478 Low friction subterranean drill bit and related methods Jul. 21, 1992
5109935 Rotary drill bits May. 5, 1992
5099934 Rotary drill bits Mar. 31, 1992
5042596 Imbalance compensated drill bit Aug. 27, 1991
5020608 Device for boring holes in the ground Jun. 4, 1991
4989681 Drill bit for producing undercuts Feb. 5, 1991
4982802 Method for stabilizing a rotary drill string and drill bit Jan. 8, 1991
4768599 Drill bit for undercutting a blind bore Sep. 6, 1988
4620600 Drill arrangement Nov. 4, 1986

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