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Class Information
Number: 175/401
Name: Boring or penetrating the earth > Bit or bit element > Cutting edges facing in opposite axial directions
Description: Apparatus in which the bit is provided with longitudinally spaced cutting edges, the cutting edges at one spacing facing in one axial direction and the cutting edges at a different spacing facing in the opposite axial direction of the bit.










Patents under this class:

Patent Number Title Of Patent Date Issued
8607900 Downhole tool engaging a tubing string between a drill bit and tubular for reaming a wellbore Dec. 17, 2013
8196683 Impregnated rotary bit Jun. 12, 2012
8146682 Apparatus and methods of milling a restricted casing shoe Apr. 3, 2012
7841425 Drilling subsurface wellbores with cutting structures Nov. 30, 2010
7255182 Ground drilling tool Aug. 14, 2007
6976549 Drilling tool Dec. 20, 2005
6843334 Drilling head of a rock drill Jan. 18, 2005
6634444 Drill bit for trenchless drilling Oct. 21, 2003
6494275 Rock drill bit having retrac teeth and method for its manufacturing Dec. 17, 2002
6321862 Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability Nov. 27, 2001
6213231 Boring tool with rectangular plates Apr. 10, 2001
6116357 Rock drill bit with back-reaming protection Sep. 12, 2000
5868212 Stabiliser tool Feb. 9, 1999
5810102 Reversible bit assembly Sep. 22, 1998
5743345 Drill bit for reverse drilling Apr. 28, 1998
5655612 Earth-boring bit with shear cutting gage Aug. 12, 1997
5467836 Fixed cutter bit with shear cutting gage Nov. 21, 1995
5415243 Rock bit borhole back reaming method May. 16, 1995
4986375 Device for facilitating drill bit retrieval Jan. 22, 1991
4953642 Rock drill bit Sep. 4, 1990
4262762 Anti-collaring structure for impact bit Apr. 21, 1981











 
 
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