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Class Information
Number: 175/99
Name: Boring or penetrating the earth > With below-ground tool drive prime mover > With means to anchor prime movers support to bore wall > Expansible anchor > Fluid-operated
Description: Apparatus in which said means is operated by pressure fluid.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8602115 Grip enhanced tractoring Dec. 10, 2013
8579037 Method and apparatus for controlled bidirectional movement of an oilfield tool in a wellbore environment Nov. 12, 2013
8302679 Expandable ramp gripper Nov. 6, 2012
8230914 Anchor tool Jul. 31, 2012
8069917 Gripper assembly for downhole tools Dec. 6, 2011
8061447 Variable linkage assisted gripper Nov. 22, 2011
7954562 Expandable ramp gripper Jun. 7, 2011
7954563 Roller link toggle gripper and downhole tractor Jun. 7, 2011
7946359 Methods and apparatus for well construction May. 24, 2011
7849937 Method and device for producing a cased string bore Dec. 14, 2010
7748476 Variable linkage assisted gripper Jul. 6, 2010
7699113 Apparatus and methods for running liners in extended reach wells Apr. 20, 2010
7624808 Expandable ramp gripper Dec. 1, 2009
7607497 Roller link toggle gripper and downhole tractor Oct. 27, 2009
7604060 Gripper assembly for downhole tools Oct. 20, 2009
7493967 Tractor with improved valve system Feb. 24, 2009
7401665 Apparatus and method for drilling a branch borehole from an oil well Jul. 22, 2008
7392859 Roller link toggle gripper and downhole tractor Jul. 1, 2008
7353890 Down-the-hole hammer and components for a down-the-hole hammer, and a method of assembling a down-the-hole hammer Apr. 8, 2008
7343982 Tractor with improved valve system Mar. 18, 2008
7306058 Anti-rotation device for a steerable rotary drilling device Dec. 11, 2007
7293615 Earth boring system Nov. 13, 2007
7287605 Steerable drilling apparatus having a differential displacement side-force exerting mechanism Oct. 30, 2007
7275593 Gripper assembly for downhole tools Oct. 2, 2007
7273109 Puller-thruster downhole tool Sep. 25, 2007
7191829 Gripper assembly for downhole tools Mar. 20, 2007
7156181 Puller-thruster downhole tool Jan. 2, 2007
7143843 Traction control for downhole tractor Dec. 5, 2006
7090037 Device for anchoring a drill string in a borehole Aug. 15, 2006
7080701 Electrically sequenced tractor Jul. 25, 2006
7059417 Puller-thruster downhole tool Jun. 13, 2006
7048047 Gripper assembly for downhole tools May. 23, 2006
6978844 Filling and circulating apparatus for subsurface exploration Dec. 27, 2005
6968904 Method and apparatus for operations in underground/subsea oil and gas wells Nov. 29, 2005
6955232 Equipment for drilling vertical boreholes Oct. 18, 2005
6953086 Bi-directional traction apparatus Oct. 11, 2005
6926102 Subsea controlled milling Aug. 9, 2005
6910533 Mechanism that assists tractoring on uniform and non-uniform surfaces Jun. 28, 2005
6839988 Drilling apparatus for hard ground Jan. 11, 2005
6840337 Method and apparatus for removing cuttings Jan. 11, 2005
6796380 High expansion anchor system Sep. 28, 2004
6758279 Puller-thruster downhole tool Jul. 6, 2004
6722442 Subsurface apparatus Apr. 20, 2004
6715559 Gripper assembly for downhole tractors Apr. 6, 2004
6698976 Grouting pipe equipment and method of grouting using the same for an underground water well Mar. 2, 2004
6684965 Method and apparatus for operations in underground subsea oil and gas wells Feb. 3, 2004
6668924 Reduced contamination sampling Dec. 30, 2003
6640894 Gripper assembly for downhole tools Nov. 4, 2003
6601652 Puller-thruster downhole tool Aug. 5, 2003
6550553 Boring apparatus Apr. 22, 2003

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