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Class Information
Number: 175/98
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
Description: Apparatus in which said means may be selectively expanded or retracted to or from engagement with the bore wall.










Sub-classes under this class:

Class Number Class Name Patents
175/99 Fluid-operated 96


Patents under this class:

Patent Number Title Of Patent Date Issued
8555963 Gripper assembly for downhole tools Oct. 15, 2013
8353354 Crawler system for an earth boring system Jan. 15, 2013
8327953 Drilling tool with feed control Dec. 11, 2012
8245796 Tractor with improved valve system Aug. 21, 2012
8230914 Anchor tool Jul. 31, 2012
8061447 Variable linkage assisted gripper Nov. 22, 2011
8028766 Electrically powered tractor Oct. 4, 2011
7954563 Roller link toggle gripper and downhole tractor Jun. 7, 2011
7823659 Apparatus and methods for drilling and lining a wellbore Nov. 2, 2010
7770667 Electrically powered tractor Aug. 10, 2010
7748476 Variable linkage assisted gripper Jul. 6, 2010
7607495 Tractor with improved valve system Oct. 27, 2009
7607497 Roller link toggle gripper and downhole tractor Oct. 27, 2009
7392859 Roller link toggle gripper and downhole tractor Jul. 1, 2008
7353886 Tractor with improved valve system Apr. 8, 2008
7287608 Method and device for drilling a hole in soil or rock material and for forming an anchoring Oct. 30, 2007
7188681 Tractor with improved valve system Mar. 13, 2007
7121364 Tractor with improved valve system Oct. 17, 2006
7080700 Tractor with improved valve system Jul. 25, 2006
6839988 Drilling apparatus for hard ground Jan. 11, 2005
6793444 Mechanical anchor Sep. 21, 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
6431270 Downhole tools with a mobility device Aug. 13, 2002
6347674 Electrically sequenced tractor Feb. 19, 2002
6210077 Mechanical ground anchor Apr. 3, 2001
6142245 Extended reach drilling system Nov. 7, 2000
6112809 Downhole tools with a mobility device Sep. 5, 2000
4986374 Apparatus for driving an upwardly directed shaft in rock Jan. 22, 1991
4099584 Flame jet tool for drilling to great depths Jul. 11, 1978











 
 
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