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Class Information
Number: 175/385
Name: Boring or penetrating the earth > Bit or bit element > Bit with leading portion (e.g., pilot) forming smaller diameter initial bore
Description: Apparatus in which the bit is provided with a leading or pilot cutting edge or portion which forms a first bore of definable diameter, and a trailing cutting edge which increases the diameter of the first bore so that the boring outline of the bit will describe at least one peripheral axial step.










Sub-classes under this class:

Class Number Class Name Patents
175/389 Impact type 36
175/388 Leading portion is a screw 19
175/387 Leading portion is core forming type 9
175/392 Leading portion is forked rotary type 6
175/386 Leading portion is separable starter 17
175/391 Plural larger diameter steps 75


Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8640792 Flexible directional drilling apparatus and related methods Feb. 4, 2014
8584776 Methods, systems, and tool assemblies for distributing weight between an earth-boring rotary drill bit and a reamer device Nov. 19, 2013
8579050 Reamer with balanced cutting structure for use in a wellbore Nov. 12, 2013
8573331 Roof mining drill bit Nov. 5, 2013
8550190 Inner bit disposed within an outer bit Oct. 8, 2013
8528661 Drill bit with electrical power generation devices Sep. 10, 2013
8499857 Downhole jack assembly sensor Aug. 6, 2013
8499834 Milling tool for establishing openings in wellbore obstructions Aug. 6, 2013
8448721 Directional drilling system May. 28, 2013
8439131 Drill bit assembly and method of performing an operation in a wellbore May. 14, 2013
8360174 Lead the bit rotary steerable tool Jan. 29, 2013
8307921 Drilling apparatus Nov. 13, 2012
8281882 Jack element for a drill bit Oct. 9, 2012
8225887 Casing and liner drilling shoes with portions configured to fail responsive to pressure, and related methods Jul. 24, 2012
8225888 Casing shoes having drillable and non-drillable cutting elements in different regions and related methods Jul. 24, 2012
8205693 Casing and liner drilling shoes having selected profile geometries, and related methods Jun. 26, 2012
8074741 Methods, systems, and bottom hole assemblies including reamer with varying effective back rake Dec. 13, 2011
8042625 Drilling tool Oct. 25, 2011
8006785 Casing and liner drilling bits and reamers Aug. 30, 2011
7992658 Pilot reamer with composite framework Aug. 9, 2011
7967083 Sensor for determining a position of a jack element Jun. 28, 2011
7861802 Flexible directional drilling apparatus and method Jan. 4, 2011
7845437 Hole opener assembly and a cone arm forming a part thereof Dec. 7, 2010
7814991 Process and apparatus for subterranean drilling Oct. 19, 2010
7779938 Swivel for use in installing large diameter casing Aug. 24, 2010
7775303 Device for a drilling tool Aug. 17, 2010
7766103 Drill bit and a single pass drilling apparatus Aug. 3, 2010
7753144 Drill bit with a retained jack element Jul. 13, 2010
7730972 Downhole turbine Jun. 8, 2010
7726415 Fixed cutter drill bit Jun. 1, 2010
7721826 Downhole jack assembly sensor May. 25, 2010
7712549 Drilling tool May. 11, 2010
7708087 Countersink roof bit drill and method for using the same May. 4, 2010
7694752 Dry drilling Apr. 13, 2010
7694756 Indenting member for a drill bit Apr. 13, 2010
7681671 Drilling apparatus having in-line extending wings and driving method thereof Mar. 23, 2010
7677338 System, method, and apparatus for passive and active updrill features on roller cone drill bits Mar. 16, 2010
7641002 Drill bit Jan. 5, 2010
7571780 Jack element for a drill bit Aug. 11, 2009
7562725 Downhole pilot bit and reamer with maximized mud motor dimensions Jul. 21, 2009
7549489 Jack element with a stop-off Jun. 23, 2009
7537067 Rotary claw bit May. 26, 2009
7533737 Jet arrangement for a downhole drill bit May. 19, 2009
7513318 Steerable underreamer/stabilizer assembly and method Apr. 7, 2009
7506706 Retaining element for a jack element Mar. 24, 2009
7464774 Drill bit and system for drilling a borehole Dec. 16, 2008
7455129 Drilling and/or chiseling tool Nov. 25, 2008
7424922 Rotary valve for a jack hammer Sep. 16, 2008
7419016 Bi-center drill bit Sep. 2, 2008
7416036 Latchable reaming bit Aug. 26, 2008

1 2 3 4










 
 
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