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Class Information
Number: 175/376
Name: Boring or penetrating the earth > Bit or bit element > Rolling cutter bit or rolling cutter bit element > Nonsymmetrical bit (e.g., nontracking)
Description: Apparatus in which the external physical form or shape of the bit is such that the bit has (1) no more than one plane of bilateral symmetry passing through a line coinciding with the longitudinal axis of the drive shaft for the bit and (2) no radial symmetry about an axis coinciding with the longitudinal axis of the drive shaft for the bit.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8672060 High shear roller cone drill bits Mar. 18, 2014
8579051 Anti-tracking spear points for earth-boring drill bits Nov. 12, 2013
8430187 Directional sidetrack well drilling system Apr. 30, 2013
8061453 Drill bit with asymmetric gage pad configuration Nov. 22, 2011
RE42445 Cutting structure for earth-boring bit to reduce tracking Jun. 14, 2011
7866417 Self sharpening steel tooth cutting structure Jan. 11, 2011
7845435 Hybrid drill bit and method of drilling Dec. 7, 2010
7841426 Hybrid drill bit with fixed cutters as the sole cutting elements in the axial center of the drill bit Nov. 30, 2010
7819208 Dynamically stable hybrid drill bit Oct. 26, 2010
7681670 Two-cone drill bit Mar. 23, 2010
7647991 Cutting structure for earth-boring bit to reduce tracking Jan. 19, 2010
7621348 Drag bits with dropping tendencies and methods for making the same Nov. 24, 2009
7549490 Arrangement of roller cone inserts Jun. 23, 2009
7549488 Two-cone drill bit with enhanced stability Jun. 23, 2009
7497281 Roller cone drill bits with enhanced cutting elements and cutting structures Mar. 3, 2009
7445063 Rock drill bit assembly Nov. 4, 2008
7299887 Roller bit with a journal pin offset from the central axis thereof Nov. 27, 2007
7234549 Methods for evaluating cutting arrangements for drill bits and their application to roller cone drill bit designs Jun. 26, 2007
7195086 Anti-tracking earth boring bit with selected varied pitch for overbreak optimization and vibration reduction Mar. 27, 2007
7152701 Cutting element structure for roller cone bit Dec. 26, 2006
6863138 High offset bits with super-abrasive cutters Mar. 8, 2005
6851493 Digital PLL with gear shift Feb. 8, 2005
6827161 Roller cone drill bit having non-axisymmetric cutting elements oriented to optimize drilling performance Dec. 7, 2004
6588515 Drill bit for directional drilling Jul. 8, 2003
6561292 Rock bit with load stabilizing cutting structure May. 13, 2003
6527068 Roller cone drill bit having non-axisymmetric cutting elements oriented to optimize drilling performance Mar. 4, 2003
RE37975 Directional boring head with blade assembly Feb. 4, 2003
6439326 Centered-leg roller cone drill bit Aug. 27, 2002
6422327 Drill bit with ridge-cutting cutter elements Jul. 23, 2002
6401839 Roller cone bits, methods, and systems with anti-tracking variation in tooth orientation Jun. 11, 2002
6374930 Cutting structure for roller cone drill bits Apr. 23, 2002
6367569 Replaceable multiple TCI kerf ring Apr. 9, 2002
6345673 High offset bits with super-abrasive cutters Feb. 12, 2002
6321858 Bit for directional drilling Nov. 27, 2001
RE37450 Directional multi-blade boring head Nov. 20, 2001
6308789 Drill bit for directional drilling Oct. 30, 2001
6263983 Apparatus for directional drilling Jul. 24, 2001
6176329 Drill bit with ridge-cutting cutter elements Jan. 23, 2001
6167975 One cone rotary drill bit featuring enhanced grooves Jan. 2, 2001
6095262 Roller-cone bits, systems, drilling methods, and design methods with optimization of tooth orientation Aug. 1, 2000
6039131 Directional drift and drill PDC drill bit Mar. 21, 2000
5996713 Rolling cutter bit with improved rotational stabilization Dec. 7, 1999
5941322 Directional boring head with blade assembly Aug. 24, 1999
5899283 Drill bit for horizontal directional drilling of rock formations May. 4, 1999
5799740 Directional boring head with blade assembly Sep. 1, 1998
5586612 Roller cone bit with positive and negative offset and smooth running configuration Dec. 24, 1996
5575537 Tunnel drilling machine or tube-driving machine Nov. 19, 1996
5456328 Drill bit with improved rolling cutter tooth pattern Oct. 10, 1995
5454437 Roller cone core bit Oct. 3, 1995
5429201 Drill bit with improved rolling cutter tooth pattern Jul. 4, 1995

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