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Class Information
Number: 175/385
Name: Boring or penetrating the earth > Bit or bit element > Bit with leading portion (e.g., pilot) forming smaller diameter initial bore
Description: Apparatus in which the bit is provided with a leading or pilot cutting edge or portion which forms a first bore of definable diameter, and a trailing cutting edge which increases the diameter of the first bore so that the boring outline of the bit will describe at least one peripheral axial step.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7360610 |
Drill bit assembly for directional drilling |
Apr. 22, 2008 |
| 7350596 |
Methods and apparatus for expanding the diameter of a borehole |
Apr. 1, 2008 |
| 7347291 |
Bit assembly |
Mar. 25, 2008 |
| 7337858 |
Drill bit assembly adapted to provide power downhole |
Mar. 4, 2008 |
| 7328755 |
Hydraulic drill bit assembly |
Feb. 12, 2008 |
| 7316277 |
Bottom hole assembly |
Jan. 8, 2008 |
| 7296639 |
Wellstring assembly |
Nov. 20, 2007 |
| 7270196 |
Drill bit assembly |
Sep. 18, 2007 |
| 7258165 |
Hole opener and drillable casing guide and methods of use |
Aug. 21, 2007 |
| 7258179 |
Rotary bit with an indenting member |
Aug. 21, 2007 |
| 7243737 |
Interchangeable reamer |
Jul. 17, 2007 |
| 7225886 |
Drill bit assembly with an indenting member |
Jun. 5, 2007 |
| 7207398 |
Steerable rotary drill bit assembly with pilot bit |
Apr. 24, 2007 |
| 7198119 |
Hydraulic drill bit assembly |
Apr. 3, 2007 |
| 7182156 |
System for overburden drilling |
Feb. 27, 2007 |
| 7137460 |
Back reaming tool |
Nov. 21, 2006 |
| 7028790 |
Rotary drill bit |
Apr. 18, 2006 |
| 7001120 |
Drilling tool |
Feb. 21, 2006 |
| 6955234 |
Auger bit |
Oct. 18, 2005 |
| 6932170 |
Drilling head |
Aug. 23, 2005 |
| 6926099 |
Drill out bi-center bit and method for using same |
Aug. 9, 2005 |
| 6913098 |
Sub-reamer for bi-center type tools |
Jul. 5, 2005 |
| 6892834 |
Piloted drill barrel and method of using same |
May. 17, 2005 |
| 6880648 |
Apparatus and method for directional drilling of holes |
Apr. 19, 2005 |
| 6742607 |
Fixed blade fixed cutter hole opener |
Jun. 1, 2004 |
| 6739416 |
Enhanced offset stabilization for eccentric reamers |
May. 25, 2004 |
| 6729418 |
Back reaming tool |
May. 4, 2004 |
| 6729420 |
Multi profile performance enhancing centric bit and method of bit design |
May. 4, 2004 |
| 6715567 |
Apparatus and method for forming a pilot hole in a formation |
Apr. 6, 2004 |
| 6702040 |
Telescopic drilling method |
Mar. 9, 2004 |
| 6655476 |
Earth boring bit |
Dec. 2, 2003 |
| 6629476 |
Bi-center bit adapted to drill casing shoe |
Oct. 7, 2003 |
| 6606923 |
Design method for drillout bi-center bits |
Aug. 19, 2003 |
| 6533048 |
Earth boring bit |
Mar. 18, 2003 |
| 6514017 |
Core drill piloting system |
Feb. 4, 2003 |
| 6488103 |
Drilling tool and method of using same |
Dec. 3, 2002 |
| 6412579 |
Two stage drill bit |
Jul. 2, 2002 |
| 6394200 |
Drillout bi-center bit |
May. 28, 2002 |
| 6386298 |
Apparatus for directional drilling |
May. 14, 2002 |
| 6386302 |
Polycrystaline diamond compact insert reaming tool |
May. 14, 2002 |
| 6386299 |
Method and apparatus for reaming pilot hole |
May. 14, 2002 |
| 6352122 |
Tool for planting flower bulbs and ornamentals |
Mar. 5, 2002 |
| 6340064 |
Bi-center bit adapted to drill casing shoe |
Jan. 22, 2002 |
| 6302198 |
One trip milling system |
Oct. 16, 2001 |
| 6213230 |
Drilling tool especially for the rotary percussion drilling of preferably rock |
Apr. 10, 2001 |
| 6202768 |
Rock drilling tool and reamer for percussive drilling |
Mar. 20, 2001 |
| 6123160 |
Drill bit with gage definition region |
Sep. 26, 2000 |
| 6116356 |
Reaming apparatus and method with enhanced stability and transition from pilot hole to enlarged bore diameter |
Sep. 12, 2000 |
| 6116827 |
Drilling tool |
Sep. 12, 2000 |
| 6112835 |
Drilling apparatus having a radially displaceable reamer |
Sep. 5, 2000 |
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