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Class Information
Number: 175/95
Name: Boring or penetrating the earth > With below-ground tool drive prime mover > Plural below-ground drive prime movers
Description: Apparatus comprising a plurality of drive motors positioned within the borehole.










Sub-classes under this class:

Class Number Class Name Patents
175/96 Plural cutter elements driven by individual prime movers 43


Patents under this class:

Patent Number Title Of Patent Date Issued
8567528 Apparatus and method for directional drilling Oct. 29, 2013
8408335 Drill string with modular motor units Apr. 2, 2013
8381839 Apparatus for directional drilling Feb. 26, 2013
8151907 Dual motor systems and non-rotating sensors for use in developing wellbores in subsurface formations Apr. 10, 2012
8109746 Progressing cavity pump/motor Feb. 7, 2012
7946361 Flow operated orienter and method of directional drilling using the flow operated orienter May. 24, 2011
7743849 Dual tractor drilling system Jun. 29, 2010
7293615 Earth boring system Nov. 13, 2007
6575236 Device for manipulating a tool in a well tubular Jun. 10, 2003
6571888 Apparatus and method for directional drilling with coiled tubing Jun. 3, 2003
6364038 Downhole flexible drive system Apr. 2, 2002
5778992 Drilling assembly for drilling holes in subsurface formations Jul. 14, 1998
5697459 Directional self-propelled drill Dec. 16, 1997
5620056 Coupling for a downhole tandem drilling motor Apr. 15, 1997
5096000 Process and apparatus for laying service lines without excavation Mar. 17, 1992
4607980 Apparatus for compacting soil, concrete and like materials Aug. 26, 1986
4314615 Self-propelled drilling head Feb. 9, 1982
4304309 Surface drilling apparatus Dec. 8, 1981
4227584 Downhole flexible drive system Oct. 14, 1980
4143722 Downhole flexible drive system Mar. 13, 1979
4098359 Hydraulically operated downhole motor Jul. 4, 1978
4047581 Multistage, downhole, turbo-powered intensifier for drilling petroleum wells Sep. 13, 1977
3941423 Method of and apparatus for extracting oil from oil shale Mar. 2, 1976











 
 
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