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Class Information
Number: 175/389
Name: Boring or penetrating the earth > Bit or bit element > Bit with leading portion (e.g., pilot) forming smaller diameter initial bore > Impact type
Description: Apparatus in which the cutting edges of the bit are of the type which disintegrate the formation by percussive action.










Sub-classes under this class:

Class Number Class Name Patents
175/390 Plural larger diameter steps 11


Patents under this class:

Patent Number Title Of Patent Date Issued
8616305 Fixed bladed bit that shifts weight between an indenter and cutting elements Dec. 31, 2013
8297378 Turbine driven hammer that oscillates at a constant frequency Oct. 30, 2012
8225883 Downhole percussive tool with alternating pressure differentials Jul. 24, 2012
8191651 Sensor on a formation engaging member of a drill bit Jun. 5, 2012
8011457 Downhole hammer assembly Sep. 6, 2011
7938205 Boring head method and boring head for a ground boring device May. 10, 2011
7891444 Drill bit Feb. 22, 2011
7775303 Device for a drilling tool Aug. 17, 2010
7735584 Percussion hammer for enlarging drilled holes Jun. 15, 2010
7730975 Drill bit porting system Jun. 8, 2010
7673706 Down-the-hole hammer with pilot and method of enlarging a hole Mar. 9, 2010
7661487 Downhole percussive tool with alternating pressure differentials Feb. 16, 2010
7641003 Downhole hammer assembly Jan. 5, 2010
7624824 Downhole hammer assembly Dec. 1, 2009
7591327 Drilling at a resonant frequency Sep. 22, 2009
7464772 Downhole pressure pulse activated by jack element Dec. 16, 2008
6641332 Foundation support and process for structures Nov. 4, 2003
6640914 Percussion borer for forming bores in stone material Nov. 4, 2003
6394197 Reverse circulation drilling system with bit locked underreamer arms May. 28, 2002
6328506 Masonry drill bit Dec. 11, 2001
6241033 Drill string apparatus and method of extending the length of a drill string Jun. 5, 2001
6213230 Drilling tool especially for the rotary percussion drilling of preferably rock Apr. 10, 2001
6209665 Reverse circulation drilling system with bit locked underreamer arms Apr. 3, 2001
6202768 Rock drilling tool and reamer for percussive drilling Mar. 20, 2001
6102634 Masonry drill bit Aug. 15, 2000
5787999 Drill bit with set of underreamer arms Aug. 4, 1998
5779403 Percussive blow assisted rotary drill Jul. 14, 1998
5052503 Eccentric drilling tool Oct. 1, 1991
4852672 Drill apparatus having a primary drill and a pilot drill Aug. 1, 1989
4549615 Single-pass notching and drilling tool and method of drilling a blast role therewith Oct. 29, 1985
4440244 Drill tool Apr. 3, 1984
4361197 Blast hole grooving bit and wear resistant compact Nov. 30, 1982
4354561 Reciprocating drill bit Oct. 19, 1982
4294319 Cutter head for rotary percussion drills Oct. 13, 1981
3955631 Soil sampler May. 11, 1976
3952819 Fatigue resistant anvil bit for percussion rock drill Apr. 27, 1976











 
 
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