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Class Information
Number: 175/266
Name: Boring or penetrating the earth > Cutter element laterally shiftable below ground (e.g., expansible) > Plural selectively shiftable cutter elements
Description: Apparatus in which a plurality of laterally movable cutter elements are provided and means are also provided which permits one of said cutter elements to move laterally while another laterally movable cutter element is temporarily held against such movement.










Patents under this class:

Patent Number Title Of Patent Date Issued
8528668 Electronically activated underreamer and calliper tool Sep. 10, 2013
8381843 Well bore reamer Feb. 26, 2013
8118099 Method and apparatus for forming and sealing a hole in a sidewall of a borehole Feb. 21, 2012
8066085 Stochastic bit noise control Nov. 29, 2011
7931098 Steerable bit system assembly and methods Apr. 26, 2011
7909100 Reversible casing cutter Mar. 22, 2011
7836975 Morphable bit Nov. 23, 2010
7802637 Steerable bit system assembly and methods Sep. 28, 2010
7757787 Drilling and hole enlargement device Jul. 20, 2010
7493971 Concentric expandable reamer and method Feb. 24, 2009
7383900 Drill bit and system for drilling a borehole Jun. 10, 2008
7370712 Under reamer May. 13, 2008
7314099 Selectively actuatable expandable underreamer/stablizer Jan. 1, 2008
7306056 Directional cased hole side track method applying rotary closed loop system and casing mill Dec. 11, 2007
7195080 Expandable drilling tool and method Mar. 27, 2007
6902014 Roller cone bi-center bit Jun. 7, 2005
6892815 Coal bed methane borehole pipe liner perforation system May. 17, 2005
6668949 Underreamer and method of use Dec. 30, 2003
6427788 Underreaming rotary drill Aug. 6, 2002
5971085 Downhole unit for use in boreholes in a subsurface formation Oct. 26, 1999
5957224 Double bit assembly and method of using the same Sep. 28, 1999
5074355 Section mill with multiple cutting blades Dec. 24, 1991
5036921 Underreamer with sequentially expandable cutter blades Aug. 6, 1991
4809793 Enhanced diameter clean-out tool and method Mar. 7, 1989
4153121 Fluid operated undercutter May. 8, 1979











 
 
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