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Class Information
Number: 175/418
Name: Boring or penetrating the earth > Bit or bit element > Impact or percussion type > With internal-fluid passage > Plural openings
Description: Apparatus in which the passage has a plurality of inlet or exhaust ports.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8550191 Digging tool, digging bit, and device Oct. 8, 2013
7581602 Downhole hammer drill Sep. 1, 2009
7467674 Rock drilling equipment Dec. 23, 2008
7455126 Percussive drill bit, drilling system comprising such a drill bit and method of drilling a bore hole Nov. 25, 2008
7410013 Boring and drilling apparatus Aug. 12, 2008
7377338 Downhole percussion tool May. 27, 2008
7296641 Rock drill bit having outer and inner rock-crushing buttons Nov. 20, 2007
7207402 Percussion drill bit and a regrindable cemented carbide button therefor Apr. 24, 2007
7168511 Rotary drill bit having cutting insert with a notch Jan. 30, 2007
7163070 Drill head Jan. 16, 2007
7070010 Drill bit Jul. 4, 2006
7011156 Percussion tool and method Mar. 14, 2006
6915867 Earth penetrating rotary drill bit with helical ports Jul. 12, 2005
6886645 Liquid seal for wet roof bit May. 3, 2005
6595305 Drill bit, hard member, and bit body Jul. 22, 2003
6543557 Drill hammer assembly Apr. 8, 2003
6467558 Multiple air hammer apparatus and excavating direction correcting method therefor Oct. 22, 2002
6315064 Rotatable cutting bit assembly with cutting inserts Nov. 13, 2001
6276467 Percussive rock drill bit with asymmetric wing Aug. 21, 2001
6253864 Percussive shearing drill bit Jul. 3, 2001
6189633 Drill Feb. 20, 2001
6105693 Partially enhanced percussive drill bit Aug. 22, 2000
6065908 Drill May. 23, 2000
6035953 Down hole hammer assembly Mar. 14, 2000
5996714 Rotatable cutting bit assembly with wedge-lock retention assembly Dec. 7, 1999
5890551 Rock drilling tool including a drill bit having a recess in a front surface thereof Apr. 6, 1999
5823274 Drill rod Oct. 20, 1998
5794728 Percussion rock drill bit Aug. 18, 1998
5590725 Drilling column with sledgehammer drilling head Jan. 7, 1997
5494119 Core sampling device Feb. 27, 1996
5407021 Down-the-hole hammer drill having reverse circulation Apr. 18, 1995
5377770 Apparatus for improving impact tool lubrication Jan. 3, 1995
5366032 Rock bit Nov. 22, 1994
5291957 Method and apparatus for jet cutting Mar. 8, 1994
5199512 Method of an apparatus for jet cutting Apr. 6, 1993
5139099 Excavation tool Aug. 18, 1992
5085285 Compensating ring for a down hole hammer Feb. 4, 1992
5038874 Drill bit having a flushing medium channel Aug. 13, 1991
5025875 Rock bit for a down-the-hole drill Jun. 25, 1991
4911729 Overburden eliminator rock drill bit Mar. 27, 1990
4852672 Drill apparatus having a primary drill and a pilot drill Aug. 1, 1989
4819746 Reverse circulation down-the-hole hammer drill and bit therefor Apr. 11, 1989
4805705 Drill bit Feb. 21, 1989
4723612 Bit, nozzle, cutter combination Feb. 9, 1988
4716976 Rotary percussion drill bit Jan. 5, 1988
4712626 Retainer device for drill bit Dec. 15, 1987
4711312 Drill bit Dec. 8, 1987
4697654 Rotary drill bits Oct. 6, 1987
4633959 Drill having means for locating cutting bit in a bit holder Jan. 6, 1987
4605079 Drill bit Aug. 12, 1986

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