Inventor
FANG ZHIGANG
US42 patents
⚠️ This page may combine multiple inventors who share the name “FANG ZHIGANG”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SMITH INTERNATIONAL
35 patentsUS6063502AMay 16, 2000
Composite construction with oriented microstructure
SMITH INTERNATIONAL119 citations99
US5880382AMar 9, 1999
Double cemented carbide composites
SMITH INTERNATIONAL290 citations99
US5662183ASep 2, 1997
High strength matrix material for PDC drag bits
SMITH INTERNATIONAL191 citations99
US5963775AOct 5, 1999
Pressure molded powder metal milled tooth rock bit cone
SMITH INTERNATIONAL97 citations98
US6029759AFeb 29, 2000
Hardfacing on steel tooth cutter element
SMITH INTERNATIONAL105 citations97
US6951578B1Oct 4, 2005
Polycrystalline diamond materials formed from coarse-sized diamond grains
SMITH INTERNATIONAL81 citations96
US6607835B2Aug 19, 2003
Composite constructions with ordered microstructure
SMITH INTERNATIONAL56 citations96
US6451442B1Sep 17, 2002
Composite constructions with oriented microstructure
SMITH INTERNATIONAL44 citations96
US6319460B1Nov 20, 2001
Metal-matrix diamond or cubic boron nitride composites
SMITH INTERNATIONAL49 citations96
US6124564ASep 26, 2000
Hardfacing compositions and hardfacing coatings formed by pulsed plasma-transferred arc
SMITH INTERNATIONAL92 citations96
US5842701ADec 1, 1998
Dual functioning seal for rock bits
SMITH INTERNATIONAL57 citations96
US5791422AAug 11, 1998
Rock bit with hardfacing material incorporating spherical cast carbide particles
SMITH INTERNATIONAL75 citations96
US7647992B2Jan 19, 2010
Polycrystalline diamond carbide composites
SMITH INTERNATIONAL40 citations95
US6615935B2Sep 9, 2003
Roller cone bits with wear and fracture resistant surface
SMITH INTERNATIONAL41 citations95
US6536542B1Mar 25, 2003
Rock bit seal with multiple dynamic seal surface elements
SMITH INTERNATIONAL70 citations95
US6454027B1Sep 24, 2002
Polycrystalline diamond carbide composites
SMITH INTERNATIONAL70 citations95
US6361873B1Mar 26, 2002
Composite constructions having ordered microstructures
SMITH INTERNATIONAL78 citations95
US6478887B1Nov 12, 2002
Boronized wear-resistant materials and methods thereof
SMITH INTERNATIONAL63 citations94
US6123337ASep 26, 2000
Composite earth boring bit seal
SMITH INTERNATIONAL69 citations94
US7235211B2Jun 26, 2007
Rotary cone bit with functionally-engineered composite inserts
SMITH INTERNATIONAL29 citations93
US6571889B2Jun 3, 2003
Rotary cone bit with functionally-engineered composite inserts
SMITH INTERNATIONAL30 citations93
US6179296B1Jan 30, 2001
Dual functioning seal for rock bits
SMITH INTERNATIONAL27 citations93
US6170830B1Jan 9, 2001
Dual functioning seal for rock bits
SMITH INTERNATIONAL23 citations93
US6106957AAug 22, 2000
Metal-matrix diamond or cubic boron nitride composites
SMITH INTERNATIONAL41 citations93
US7210377B2May 1, 2007
Cone erosion protection for roller cone drill bits
SMITH INTERNATIONAL18 citations92
US6406030B1Jun 18, 2002
O-ring seal with lubricant additives for rock bit bearings
SMITH INTERNATIONAL28 citations92
US5944127AAug 31, 1999
Hardfacing material for rock bits
SMITH INTERNATIONAL47 citations92
US5842700ADec 1, 1998
Composite rock bit seal
SMITH INTERNATIONAL35 citations90
US5589443ADec 31, 1996
Rock bit grease composition
SMITH INTERNATIONAL32 citations90
US6698098B2Mar 2, 2004
Cone erosion protection for roller cone drill bits
SMITH INTERNATIONAL13 citations84
US7211218B2May 1, 2007
Polycrystalline diamond carbide composites
SMITH INTERNATIONAL11 citations83
US6244364B1Jun 12, 2001
Earth-boring bit having cobalt/tungsten carbide inserts
SMITH INTERNATIONAL17 citations82
US7264879B2Sep 4, 2007
Composite constructions with oriented microstructure
SMITH INTERNATIONAL4 citations74
US6841260B2Jan 11, 2005
Composite constructions with oriented microstructure
SMITH INTERNATIONAL10 citations74
US8956438B2Feb 17, 2015
Low coefficient of thermal expansion cermet compositions
SMITH INTERNATIONAL0 citations52