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Class Information
Number: 175/375
Name: Boring or penetrating the earth > Bit or bit element > Rolling cutter bit or rolling cutter bit element > Specific or diverse material > Welded
Description: Apparatus in which portions of the bit are connected together by (1) heating the parts to a plastic or fluid state and allowing the metals to flow together with or without the addition of other molten metal or (2) connecting the parts by means of melted or fluid metal (e.g., solder).

Patents under this class:
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Patent Number Title Of Patent Date Issued
8617289 Hardfacing compositions for earth boring tools Dec. 31, 2013
8322466 Drill bits and other downhole tools with hardfacing having tungsten carbide pellets and other hard materials and methods of making thereof Dec. 4, 2012
8074869 System, method, and apparatus for reactive foil brazing of cutter components for fixed cutter bit Dec. 13, 2011
8002052 Particle-matrix composite drill bits with hardfacing Aug. 23, 2011
7891443 Hardfacing around ball loading hole for earth-boring bit Feb. 22, 2011
7866417 Self sharpening steel tooth cutting structure Jan. 11, 2011
7779937 Steel tooth bit with scooped teeth profile Aug. 24, 2010
7770672 Layered hardfacing, durable hardfacing for drill bits Aug. 10, 2010
7666244 Hardfacing milled-tooth drill bits using super dense carbide pellets Feb. 23, 2010
7597159 Drill bits and drilling tools including abrasive wear-resistant materials Oct. 6, 2009
7543661 Roller cone bits with wear and fracture resistant surface Jun. 9, 2009
7392865 Randomly-oriented composite constructions Jul. 1, 2008
7373997 Layered hardfacing, durable hardfacing for drill bits May. 20, 2008
7343990 Rotary rock bit with hardfacing to reduce cone erosion Mar. 18, 2008
7243744 Randomly-oriented composite constructions Jul. 17, 2007
7048080 Roller cone bits with wear and fracture resistant surface May. 23, 2006
6782958 Hardfacing for milled tooth drill bits Aug. 31, 2004
6568490 Method and apparatus for fabricating rotary cone drill bits May. 27, 2003
6510906 Impregnated bit with PDC cutters in cone area Jan. 28, 2003
6470558 Method for facing a substrate Oct. 29, 2002
6392190 Automated hardfacing system May. 21, 2002
6253862 Earth-boring bit with cutter spear point hardfacing Jul. 3, 2001
6109375 Method and apparatus for fabricating rotary cone drill bits Aug. 29, 2000
5839525 Directional drill bit Nov. 24, 1998
5791423 Earth-boring bit having an improved hard-faced tooth structure Aug. 11, 1998
5755299 Hardfacing with coated diamond particles May. 26, 1998
5641029 Rotary cone drill bit modular arm Jun. 24, 1997
5624002 Rotary drill bit Apr. 29, 1997
5579856 Gage surface and method for milled tooth cutting structure Dec. 3, 1996
5553681 Rotary cone drill bit with angled ramps Sep. 10, 1996
5524510 Method and apparatus for manufacturing a rock bit leg Jun. 11, 1996
5348770 Method of forming an uninterrupted refractory coating on a downhole drill bit cone Sep. 20, 1994
5305840 Rock bit with cobalt alloy cemented tungsten carbide inserts Apr. 26, 1994
5040623 Controlled true geometry rock bit with one piece body Aug. 20, 1991
4941711 Cemented carbide tip Jul. 17, 1990
4814234 Surface protection method and article formed thereby Mar. 21, 1989
4726432 Differentially hardfaced rock bit Feb. 23, 1988
4711143 Rock bit assembly method Dec. 8, 1987
4699227 Method of forming cutting structures for rotary drill bits Oct. 13, 1987
4617446 Welding fixture for rotary cone rock bits with belleville seals Oct. 14, 1986
4593776 Rock bits having metallurgically bonded cutter inserts Jun. 10, 1986
4382477 Rotary drill bits May. 10, 1983
4369849 Large diameter oil well drilling bit Jan. 25, 1983
4258807 Method for making rock bits Mar. 31, 1981
4256194 Rotary drill bit having a solid forged, unitary body Mar. 17, 1981
4243727 Surface smoothed tool joint hardfacing Jan. 6, 1981
4229638 Unitized rotary rock bit Oct. 21, 1980
4225322 Composite compact components fabricated with high temperature brazing filler metal and method for making same Sep. 30, 1980
4158973 Rolling cutter drill bit Jun. 26, 1979
4156123 Method for making rock bits May. 22, 1979

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