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Class Information
Number: 175/51
Name: Boring or penetrating the earth > With self-acting cyclic advance and retraction of tool or tool shaft
Description: Process or apparatus combined with a step or means requiring no other control by an operator other than the initial starting or presetting of the condition of operation, for the tool or tool shaft to follow a complete cycle of operation of advance and retraction or retraction and advance returning to its original or starting position and then stopping.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8636086 Methods of drilling with a downhole drilling machine Jan. 28, 2014
8602115 Grip enhanced tractoring Dec. 10, 2013
8511403 Steerable ground piercing tools Aug. 20, 2013
8499855 Devices and methods for horizontal directional drilling with a boring tool library Aug. 6, 2013
8485278 Methods and apparatuses for inhibiting rotational misalignment of assemblies in expandable well tools Jul. 16, 2013
8362915 System and method for determining stretch or compression of a drill string Jan. 29, 2013
8322463 Down hole multiple piston tools operated by pulse generation tools and methods for drilling Dec. 4, 2012
8256539 Steerable ground piercing tools Sep. 4, 2012
8245796 Tractor with improved valve system Aug. 21, 2012
8191655 Apparatus and method for reaming a wellbore during the installation of a tubular string Jun. 5, 2012
8151902 Slickline conveyed bottom hole assembly with tractor Apr. 10, 2012
8028766 Electrically powered tractor Oct. 4, 2011
7967082 Downhole mechanism Jun. 28, 2011
7946358 Sequence valve and a downhole tractor May. 24, 2011
7770667 Electrically powered tractor Aug. 10, 2010
7743850 Apparatus and method for reducing required torque Jun. 29, 2010
7743849 Dual tractor drilling system Jun. 29, 2010
7740060 Method and device at rock drilling Jun. 22, 2010
7617886 Fluid-actuated hammer bit Nov. 17, 2009
7607495 Tractor with improved valve system Oct. 27, 2009
7562700 Wireline supported tubular mill Jul. 21, 2009
7493967 Tractor with improved valve system Feb. 24, 2009
7392859 Roller link toggle gripper and downhole tractor Jul. 1, 2008
7363989 Device for a pulling tool for use in pipes and boreholes for the production of oil and gas Apr. 29, 2008
7353886 Tractor with improved valve system Apr. 8, 2008
7343982 Tractor with improved valve system Mar. 18, 2008
7322430 Apparatus and method for reducing required torque Jan. 29, 2008
7264066 Drilling apparatus and method for introducing a drilling element into the soil Sep. 4, 2007
7188681 Tractor with improved valve system Mar. 13, 2007
7185716 Electrically sequenced tractor Mar. 6, 2007
7174974 Electrically sequenced tractor Feb. 13, 2007
7159673 Drilling system with expandable sleeve Jan. 9, 2007
7156192 Open hole tractor with tracks Jan. 2, 2007
7121364 Tractor with improved valve system Oct. 17, 2006
7080701 Electrically sequenced tractor Jul. 25, 2006
7080700 Tractor with improved valve system Jul. 25, 2006
7073610 Downhole tool Jul. 11, 2006
6938708 Electrically sequenced tractor Sep. 6, 2005
6845825 Method and apparatus for attaching/detaching drill rod Jan. 25, 2005
6761231 Rotary driven drilling hammer Jul. 13, 2004
6745854 Electrically sequenced tractor Jun. 8, 2004
6743029 Back wire ground clamp Jun. 1, 2004
6736223 Thrust control apparatus May. 18, 2004
6679341 Tractor with improved valve system Jan. 20, 2004
6478097 Electrically sequenced tractor Nov. 12, 2002
6467557 Long reach rotary drilling assembly Oct. 22, 2002
6427786 Electro-hydraulically controlled tractor Aug. 6, 2002
6347674 Electrically sequenced tractor Feb. 19, 2002
6297966 Memory module having improved heat dissipation and shielding Oct. 2, 2001
6286613 Impact method and the device used in standard penetration test Sep. 11, 2001

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