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Class Information
Number: 175/96
Name: Boring or penetrating the earth > With below-ground tool drive prime mover > Plural below-ground drive prime movers > Plural cutter elements driven by individual prime movers
Description: Apparatus wherein the tool is composed of a plurality of relatively movable cutting elements, each of said cutting elements being driven by a separate motor.

Patents under this class:

Patent Number Title Of Patent Date Issued
8141660 Excavator apparatus for underground excavation Mar. 27, 2012
8128178 Cutter head for a ground cutter machine having rotary cutters Mar. 6, 2012
8083010 Drilling device for drilling and reaming of a hole Dec. 27, 2011
7814993 Downhole power generator and method Oct. 19, 2010
7661209 Foundation construction device for producing trenches in the soil Feb. 16, 2010
7591514 Cutter head for an excavator machine Sep. 22, 2009
7363733 Device and method for making a trench wall in the soil Apr. 29, 2008
7363990 Cutting device and method for producing a cut hole Apr. 29, 2008
7290624 Method and device for drilling holes in soil or rock material Nov. 6, 2007
6981561 Downhole cutting mill Jan. 3, 2006
6467558 Multiple air hammer apparatus and excavating direction correcting method therefor Oct. 22, 2002
6439322 Downhole hammer-type core barrel and method of using same Aug. 27, 2002
6422328 Dual cutting mill Jul. 23, 2002
6189630 Downhole hammer-type core barrel Feb. 20, 2001
6179055 Conveying a tool along a non-vertical well Jan. 30, 2001
5954131 Method and apparatus for conveying a logging tool through an earth formation Sep. 21, 1999
5735358 Indexing percussive drilling bit Apr. 7, 1998
5174390 Modular cluster drill apparatus Dec. 29, 1992
5090487 Drill head with integral impact hammers Feb. 25, 1992
4883134 Milling machine for cutting trenches Nov. 28, 1989
4883133 Combustion operated drilling apparatus Nov. 28, 1989
4878547 Rock drilling apparatus Nov. 7, 1989
4844549 Milling machine for digging trenches in the earth Jul. 4, 1989
4824176 Milling engine for excavating trenches in the ground Apr. 25, 1989
4800967 Drilling machine for digging trenches in the ground Jan. 31, 1989
4796713 Activated earth drill Jan. 10, 1989
4732226 Drilling machine Mar. 22, 1988
4729439 Gang drill construction Mar. 8, 1988
4718504 Trench excavator Jan. 12, 1988
4694915 Slotted wall milling cutter Sep. 22, 1987
4682660 Hydro-drill with circular impression Jul. 28, 1987
4671367 Pole hole digger with percussive core drilling Jun. 9, 1987
4629010 Process and device for sinking wells Dec. 16, 1986
4550952 Mining machine with adjustable hood-scoop assembly Nov. 5, 1985
4410053 Apparatus for drilling hard material Oct. 18, 1983
4330155 Bore hole mining May. 18, 1982
4254994 Method of an apparatus for gaining access to an underground chamber Mar. 10, 1981
4186810 Fluid operated undercutter Feb. 5, 1980
4153121 Fluid operated undercutter May. 8, 1979
4133396 Drilling and casing landing apparatus and method Jan. 9, 1979
4133397 Drilling with multiple in-hole motors Jan. 9, 1979
4102415 Drilling device Jul. 25, 1978
4013319 Tunneling machine with massive guide for impact tools Mar. 22, 1977

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