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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 6588515 |
Drill bit for directional drilling |
Jul. 8, 2003 |
| 6588520 |
Rock drill |
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 |
| 6422328 |
Dual cutting mill |
Jul. 23, 2002 |
| 6422782 |
Apparatus for mounting an electronic device for use in directional drilling |
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 |
| 6039131 |
Directional drift and drill PDC drill bit |
Mar. 21, 2000 |
| 6032750 |
Drilling tool having a drill bit with primary and secondary cutting edges |
Mar. 7, 2000 |
| 5950743 |
Method for horizontal directional drilling of rock formations |
Sep. 14, 1999 |
| 5937958 |
Drill bits with predictable walk tendencies |
Aug. 17, 1999 |
| 5931240 |
Drill bit concave steering channel for horizontal directional drilling |
Aug. 3, 1999 |
| 5899283 |
Drill bit for horizontal directional drilling of rock formations |
May. 4, 1999 |
| 5895179 |
Drill |
Apr. 20, 1999 |
| 5778991 |
Directional boring |
Jul. 14, 1998 |
| 5765653 |
Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter |
Jun. 16, 1998 |
| 5497842 |
Reamer wing for enlarging a borehole below a smaller-diameter portion therof |
Mar. 12, 1996 |
| 5301763 |
Apparatus for drilling holes in mine roofs and a roof drill bit for use therein |
Apr. 12, 1994 |
| RE34435 |
Whirl resistant bit |
Nov. 9, 1993 |
| 5178222 |
Drill bit having enhanced stability |
Jan. 12, 1993 |
| 5148880 |
Apparatus for drilling a horizontal controlled borehole in the earth |
Sep. 22, 1992 |
| 5099929 |
Unbalanced PDC drill bit with right hand walk tendencies, and method of drilling right hand bore holes |
Mar. 31, 1992 |
| 5052503 |
Eccentric drilling tool |
Oct. 1, 1991 |
| 5040621 |
Flushing means for drilling tools |
Aug. 20, 1991 |
| 5038859 |
Cutting tool for removing man-made members from well bore |
Aug. 13, 1991 |
| 5009271 |
Drill assembly |
Apr. 23, 1991 |
| 5009274 |
Laterally adjustable drilling tool |
Apr. 23, 1991 |
| 4989681 |
Drill bit for producing undercuts |
Feb. 5, 1991 |
| 4951761 |
Rock drill |
Aug. 28, 1990 |
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