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Class Information
Number: 175/400
Name: Boring or penetrating the earth > Bit or bit element > Nonsymmetrical bit > Nonsymmetrical arrangement of opening for cuttings or fluid
Description: Apparatus in which the bit is provided with one or more openings to permit the ingress or egress of either fluid or formation cuttings, the arrangement of the opening or openings with respect to the longitudinal axis of the drive shaft for the bit being nonsymmetrical both bilaterally and radially as required by the definition of subclass 398.










Patents under this class:

Patent Number Title Of Patent Date Issued
8689908 Drill bit having enhanced stabilization features and method of use thereof Apr. 8, 2014
7886851 Drill bit nozzle Feb. 15, 2011
7278499 Rotary drag bit including a central region having a plurality of cutting structures Oct. 9, 2007
7093671 Pneumatic rock-boring device and method for starting such a device Aug. 22, 2006
6834733 Spiral wave bladed drag bit Dec. 28, 2004
6250857 Drill Jun. 26, 2001
6209660 Drill bit shear relief for horizontal directional drilling of rock formations Apr. 3, 2001
6125950 Collared boring bit Oct. 3, 2000
6062325 Rotary drill bits May. 16, 2000
5950743 Method for horizontal directional drilling of rock formations Sep. 14, 1999
5794728 Percussion rock drill bit Aug. 18, 1998
5699868 Rotary drill bits having nozzles to enhance recirculation Dec. 23, 1997
5553682 Rock drill Sep. 10, 1996
5492184 Earth boring device Feb. 20, 1996
5148880 Apparatus for drilling a horizontal controlled borehole in the earth Sep. 22, 1992
5099934 Rotary drill bits Mar. 31, 1992
5020608 Device for boring holes in the ground Jun. 4, 1991
4953638 Method of and apparatus for drilling a horizontal controlled borehole in the earth Sep. 4, 1990
4951761 Rock drill Aug. 28, 1990
4848489 Drag drill bit having improved arrangement of cutting elements Jul. 18, 1989
4730682 Erosion resistant rock drill bit Mar. 15, 1988
4697654 Rotary drill bits Oct. 6, 1987
4682661 Drilling apparatus Jul. 28, 1987
4676324 Drill bit and cutter therefor Jun. 30, 1987
4574895 Solid head bit with tungsten carbide central core Mar. 11, 1986
RE32076 Modular screw anchor having lead point non-integral with helix plate Feb. 4, 1986
4334392 Modular screw anchor having lead point non-integral with helix plate Jun. 15, 1982
4304312 Percussion drill bit having centrally projecting insert Dec. 8, 1981
4299298 Down-the-hole drilling Nov. 10, 1981
4241800 Cutting tool for a pneumatic hammer Dec. 30, 1980
4177867 Self-drilling dowel with an inclined rolling head Dec. 11, 1979
4098363 Diamond drilling bit for soft and medium hard formations Jul. 4, 1978
4083415 Mining bit with replaceable work engaging member Apr. 11, 1978
3997011 Button drill bit structure Dec. 14, 1976
3955635 Percussion drill bit May. 11, 1976
3941197 Rotary percussion earth boring bit Mar. 2, 1976











 
 
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