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Class Information
Number: 175/398
Name: Boring or penetrating the earth > Bit or bit element > Nonsymmetrical bit
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.

Sub-classes under this class:

Class Number Class Name Patents
175/400 Nonsymmetrical arrangement of opening for cuttings or fluid 36
175/399 With bore wall engaging guide 51

Patents under this class:
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Patent Number Title Of Patent Date Issued
8631883 Sectorial force balancing of drill bits Jan. 21, 2014
8561729 Casing bit and casing reamer designs Oct. 22, 2013
8544569 Offset rock bit with pull back adapter Oct. 1, 2013
8430187 Directional sidetrack well drilling system Apr. 30, 2013
8210286 Impregnated rotary bit Jul. 3, 2012
8196683 Impregnated rotary bit Jun. 12, 2012
8122979 Offset rock bit with pull back adapter Feb. 28, 2012
8061453 Drill bit with asymmetric gage pad configuration Nov. 22, 2011
8042625 Drilling tool Oct. 25, 2011
7958940 Method and apparatus to remove composite frac plugs from casings in oil and gas wells Jun. 14, 2011
7958953 Drilling tool Jun. 14, 2011
7950476 Drill bit and cutter element having chisel crest with protruding pilot portion May. 31, 2011
7891444 Drill bit Feb. 22, 2011
7836980 Earth-boring tools having pockets for receiving cutting elements and methods for forming earth-boring tools including such pockets Nov. 23, 2010
7766103 Drill bit and a single pass drilling apparatus Aug. 3, 2010
7694755 System, method, and apparatus for variable junk slot depth in drill bit body to alleviate balling Apr. 13, 2010
7631709 Drill bit and cutter element having chisel crest with protruding pilot portion Dec. 15, 2009
7621348 Drag bits with dropping tendencies and methods for making the same Nov. 24, 2009
7559379 Downhole steering Jul. 14, 2009
7549488 Two-cone drill bit with enhanced stability Jun. 23, 2009
7549490 Arrangement of roller cone inserts Jun. 23, 2009
7513319 Reamer bit Apr. 7, 2009
7228922 Drill bit Jun. 12, 2007
7137462 Drill bit Nov. 21, 2006
7086489 Multi-lobed cutter element for drill bit Aug. 8, 2006
7036609 Sonde housing and method of manufacture May. 2, 2006
6913098 Sub-reamer for bi-center type tools Jul. 5, 2005
6789635 Drill bit for directional drilling in cobble formations Sep. 14, 2004
6695080 Reaming apparatus and method with enhanced structural protection Feb. 24, 2004
6634444 Drill bit for trenchless drilling Oct. 21, 2003
6588520 Rock drill Jul. 8, 2003
6588515 Drill bit for directional drilling Jul. 8, 2003
6533052 Drill bit for impact-assisted directional boring Mar. 18, 2003
6516899 Method and apparatus for directional boring under mixed conditions Feb. 11, 2003
6474425 Asymmetric diamond impregnated drill bit Nov. 5, 2002
6470979 Sonde housing structure Oct. 29, 2002
6450269 Method and bit for directional horizontal boring Sep. 17, 2002
6422782 Apparatus for mounting an electronic device for use in directional drilling Jul. 23, 2002
6422328 Dual cutting mill Jul. 23, 2002
6397958 Reaming apparatus and method with ability to drill out cement and float equipment in casing Jun. 4, 2002
6321858 Bit for directional drilling Nov. 27, 2001
6308790 Drag bits with predictable inclination tendencies and behavior Oct. 30, 2001
6296069 Bladed drill bit with centrally distributed diamond cutters Oct. 2, 2001
6263983 Apparatus for directional drilling Jul. 24, 2001
6260634 Sonde housing for directional drilling Jul. 17, 2001
6247544 Duckbill with cutting teeth Jun. 19, 2001
6148935 Joint for use in a directional boring apparatus Nov. 21, 2000
6125950 Collared boring bit Oct. 3, 2000
6116356 Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter Sep. 12, 2000
RE36817 Method and apparatus for drilling and enlarging a borehole Aug. 15, 2000

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