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Class Information
Number: 175/391
Name: Boring or penetrating the earth > Bit or bit element > Bit with leading portion (e.g., pilot) forming smaller diameter initial bore > Plural larger diameter steps
Description: Apparatus in which the cutting edges of the bit are arranged so that the boring outline of the bit will describe at least two peripheral axial steps.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7384223 |
Anchoring drill bit, system and method of anchoring |
Jun. 10, 2008 |
| 7293617 |
Polycrystaline diamond compact insert reaming tool |
Nov. 13, 2007 |
| 7137463 |
Polycrystaline diamond compact insert reaming tool |
Nov. 21, 2006 |
| 7048078 |
Expandable underreamer/stabilizer |
May. 23, 2006 |
| 6926099 |
Drill out bi-center bit and method for using same |
Aug. 9, 2005 |
| 6902014 |
Roller cone bi-center bit |
Jun. 7, 2005 |
| 6860344 |
Monolithic roof cutting bit insert |
Mar. 1, 2005 |
| 6840337 |
Method and apparatus for removing cuttings |
Jan. 11, 2005 |
| 6824331 |
Screw form anchor device |
Nov. 30, 2004 |
| 6742607 |
Fixed blade fixed cutter hole opener |
Jun. 1, 2004 |
| 6695080 |
Reaming apparatus and method with enhanced structural protection |
Feb. 24, 2004 |
| 6659207 |
Bi-centered drill bit having enhanced casing drill-out capability and improved directional stability |
Dec. 9, 2003 |
| 6655476 |
Earth boring bit |
Dec. 2, 2003 |
| 6629476 |
Bi-center bit adapted to drill casing shoe |
Oct. 7, 2003 |
| 6609580 |
Polycrystalline diamond compact insert reaming tool |
Aug. 26, 2003 |
| 6533048 |
Earth boring bit |
Mar. 18, 2003 |
| 6471445 |
Rotary displacement piling equipment |
Oct. 29, 2002 |
| 6464024 |
Bi-centered drill bit having improved drilling stability, mud hydraulics and resistance to cutter damage |
Oct. 15, 2002 |
| 6412579 |
Two stage drill bit |
Jul. 2, 2002 |
| 6397958 |
Reaming apparatus and method with ability to drill out cement and float equipment in casing |
Jun. 4, 2002 |
| 6394200 |
Drillout bi-center bit |
May. 28, 2002 |
| 6386302 |
Polycrystaline diamond compact insert reaming tool |
May. 14, 2002 |
| 6340064 |
Bi-center bit adapted to drill casing shoe |
Jan. 22, 2002 |
| 6298929 |
Bi-center bit assembly |
Oct. 9, 2001 |
| 6283231 |
Soil displacing screw auger and method for making a concrete pile with this auger |
Sep. 4, 2001 |
| 6269893 |
Bi-centered drill bit having improved drilling stability mud hydraulics and resistance to cutter damage |
Aug. 7, 2001 |
| RE36817 |
Method and apparatus for drilling and enlarging a borehole |
Aug. 15, 2000 |
| 6076618 |
Rock drilling tool with radially extendable two-piece reamer |
Jun. 20, 2000 |
| 5992547 |
Rotary drill bits |
Nov. 30, 1999 |
| 5992548 |
Bi-center bit with oppositely disposed cutting surfaces |
Nov. 30, 1999 |
| 5931235 |
Cutter head, boring jig and device and process for sea bottom boring |
Aug. 3, 1999 |
| 5875860 |
Drill for making a pole in the ground and a method for applying such a drill |
Mar. 2, 1999 |
| 5803195 |
System, method and cutterhead for dry full-area drilling |
Sep. 8, 1998 |
| 5735360 |
Mining bit |
Apr. 7, 1998 |
| 5678644 |
Bi-center and bit method for enhancing stability |
Oct. 21, 1997 |
| 5497842 |
Reamer wing for enlarging a borehole below a smaller-diameter portion therof |
Mar. 12, 1996 |
| 5476149 |
Pilot bit |
Dec. 19, 1995 |
| 5456552 |
Method and apparatus for installing pipe in horizontal borehole |
Oct. 10, 1995 |
| 5445222 |
Whipstock and staged sidetrack mill |
Aug. 29, 1995 |
| 5433033 |
Excavating tooth and shank plate assembly |
Jul. 18, 1995 |
| 5427191 |
Auger head assembly and method of drilling hard earth formations |
Jun. 27, 1995 |
| 5417292 |
Large diameter rock drill |
May. 23, 1995 |
| 5366031 |
Auger head assembly and method of drilling hard earth formations |
Nov. 22, 1994 |
| 5109924 |
One trip window cutting tool method and apparatus |
May. 5, 1992 |
| 4986373 |
Post hole digger |
Jan. 22, 1991 |
| 4854404 |
Bucket auger |
Aug. 8, 1989 |
| 4754526 |
System including a multi-stepped nozzle assembly for back-boring an inground passageway |
Jul. 5, 1988 |
| 4706765 |
Drill bit assembly |
Nov. 17, 1987 |
| 4682660 |
Hydro-drill with circular impression |
Jul. 28, 1987 |
| 4630694 |
Integral blade hole opener |
Dec. 23, 1986 |
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