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Class Information
Number: 175/269
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > Cutter element shifted by fluid pressure > Fluid pressure acts against spring biased part
Description: Apparatus in which the laterally movable cutter element or part acted on by the pressure fluid is also acted upon by a resilient means urging the cutter element or part in a direction opposite to that exerted by the pressure fluid.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7401666 |
Reaming and stabilization tool and method for its use in a borehole |
Jul. 22, 2008 |
| 7370712 |
Under reamer |
May. 13, 2008 |
| 7325630 |
Hole opener |
Feb. 5, 2008 |
| 7314099 |
Selectively actuatable expandable underreamer/stablizer |
Jan. 1, 2008 |
| 7293616 |
Expandable bit |
Nov. 13, 2007 |
| 7252163 |
Downhole under-reamer tool |
Aug. 7, 2007 |
| 7195080 |
Expandable drilling tool and method |
Mar. 27, 2007 |
| 7195085 |
Drill bit |
Mar. 27, 2007 |
| 7131504 |
Pressure activated release member for an expandable drillbit |
Nov. 7, 2006 |
| 7048078 |
Expandable underreamer/stabilizer |
May. 23, 2006 |
| 6948573 |
Rock breaker tool |
Sep. 27, 2005 |
| 6929076 |
Bore hole underreamer having extendible cutting arms |
Aug. 16, 2005 |
| 6920944 |
Apparatus and method for drilling and reaming a borehole |
Jul. 26, 2005 |
| 6920923 |
Section mill for wells |
Jul. 26, 2005 |
| 6837315 |
Rotary steerable drilling tool |
Jan. 4, 2005 |
| 6668949 |
Underreamer and method of use |
Dec. 30, 2003 |
| 6595301 |
Single-blade underreamer |
Jul. 22, 2003 |
| 6427788 |
Underreaming rotary drill |
Aug. 6, 2002 |
| 6378626 |
Balanced torque drilling system |
Apr. 30, 2002 |
| 6378632 |
Remotely operable hydraulic underreamer |
Apr. 30, 2002 |
| 6360831 |
Borehole opener |
Mar. 26, 2002 |
| 6109372 |
Rotary steerable well drilling system utilizing hydraulic servo-loop |
Aug. 29, 2000 |
| 6059051 |
Integrated directional under-reamer and stabilizer |
May. 9, 2000 |
| 6009961 |
Underreamer with turbulence cleaning mechanism |
Jan. 4, 2000 |
| 5896940 |
Underreamer |
Apr. 27, 1999 |
| 5862870 |
Wellbore section milling |
Jan. 26, 1999 |
| 5735359 |
Wellbore cutting tool |
Apr. 7, 1998 |
| 5642787 |
Section milling |
Jul. 1, 1997 |
| 5402856 |
Anti-whirl underreamer |
Apr. 4, 1995 |
| 5310012 |
Actuating device associated with a drill string and comprising a hydrostatic drilling fluid circuit, actuation method and application thereof |
May. 10, 1994 |
| 5303776 |
Device for a down-hole assembly |
Apr. 19, 1994 |
| 5201817 |
Downhole cutting tool |
Apr. 13, 1993 |
| 5139098 |
Combined drill and underreamer tool |
Aug. 18, 1992 |
| 5111893 |
Device for drilling in and/or lining holes in earth |
May. 12, 1992 |
| 5086852 |
Fluid flow control system for operating a down-hole tool |
Feb. 11, 1992 |
| 5018580 |
Section milling tool |
May. 28, 1991 |
| 5010955 |
Casing mill and method |
Apr. 30, 1991 |
| 4951760 |
Remote control actuation device |
Aug. 28, 1990 |
| 4893675 |
Section milling tool |
Jan. 16, 1990 |
| 4865137 |
Drilling apparatus and cutter |
Sep. 12, 1989 |
| 4858703 |
Self-propelled subsoil penetrating tool system |
Aug. 22, 1989 |
| 4846290 |
Underreamer with revolving diamond cutter elements |
Jul. 11, 1989 |
| 4821817 |
Actuator for an appliance associated with a ducted body, especially a drill rod |
Apr. 18, 1989 |
| 4776394 |
Hydraulic stabilizer for bore hole tool |
Oct. 11, 1988 |
| 4660657 |
Underreamer |
Apr. 28, 1987 |
| 4618009 |
Reaming tool |
Oct. 21, 1986 |
| 4614242 |
Bore hole enlarging arrangement and method |
Sep. 30, 1986 |
| 4589504 |
Well bore enlarger |
May. 20, 1986 |
| 4565252 |
Borehole operating tool with fluid circulation through arms |
Jan. 21, 1986 |
| 4533003 |
Drilling apparatus and cutter therefor |
Aug. 6, 1985 |
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