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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:
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Patent Number Title Of Patent Date Issued
8608411 Device for consolidating soils by means of mechanical mixing and injection of consolidating fluids Dec. 17, 2013
8540035 Extendable cutting tools for use in a wellbore Sep. 24, 2013
8485282 Earth-boring tools having expandable cutting structures and methods of using such earth-boring tools Jul. 16, 2013
8464812 Remotely controlled apparatus for downhole applications and related methods Jun. 18, 2013
8459375 Tools for use in drilling or enlarging well bores having expandable structures and methods of making and using such tools Jun. 11, 2013
8453763 Expandable earth-boring wellbore reamers and related methods Jun. 4, 2013
8381837 Downhole tool deactivation and re-activation Feb. 26, 2013
8360173 Positive engagement underreamer and method Jan. 29, 2013
8225884 Rotor underreamer, section mill, casing cutter, casing scraper and drill string centralizer Jul. 24, 2012
8215418 Expandable reamer apparatus and related methods Jul. 10, 2012
8028763 Downhole tool Oct. 4, 2011
8028767 Expandable stabilizer with roller reamer elements Oct. 4, 2011
8020635 Expandable reamer apparatus Sep. 20, 2011
7997354 Expandable reamers for earth-boring applications and methods of using the same Aug. 16, 2011
7975783 Reaming and stabilization tool and method for its use in a borehole Jul. 12, 2011
7958951 Method for assembling an underreaming tool Jun. 14, 2011
7909100 Reversible casing cutter Mar. 22, 2011
7900717 Expandable reamers for earth boring applications Mar. 8, 2011
7823663 Expandable reamer Nov. 2, 2010
7757787 Drilling and hole enlargement device Jul. 20, 2010
7703553 Downhole tool having radially extendable members Apr. 27, 2010
7665550 Underreamer and method of use Feb. 23, 2010
RE41119 Borehole opener Feb. 16, 2010
7658241 Underreaming and stabilizing tool and method for its use Feb. 9, 2010
7654342 Underreaming and stabilization tool for use in a borehole and method for its use Feb. 2, 2010
7597158 Drilling and hole enlargement device Oct. 6, 2009
7594552 Expandable reamer apparatus for enlarging boreholes while drilling Sep. 29, 2009
7584811 Reaming and stabilization tool and method for its use in a borehole Sep. 8, 2009
7493971 Concentric expandable reamer and method Feb. 24, 2009
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
7195085 Drill bit Mar. 27, 2007
7195080 Expandable drilling tool and method 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

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