Inventor
ZAHRADNIK ANTON F
US42 patents
⚠️ This page may combine multiple inventors who share the name “ZAHRADNIK ANTON F”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
BAKER HUGHES INC
30 patentsUS7387177B2Jun 17, 2008
Bearing insert sleeve for roller cone bit
BAKER HUGHES INC73 citations97
US7900717B2Mar 8, 2011
Expandable reamers for earth boring applications
BAKER HUGHES INC83 citations95
US7392862B2Jul 1, 2008
Seal insert ring for roller cone bits
BAKER HUGHES INC56 citations95
US6651756B1Nov 25, 2003
Steel body drill bits with tailored hardfacing structural elements
BAKER HUGHES INC135 citations95
US6026917AFeb 22, 2000
Earth-boring bit with improved bearing seal
BAKER HUGHES INC58 citations95
US5351769AOct 4, 1994
Earth-boring bit having an improved hard-faced tooth structure
BAKER HUGHES INC34 citations93
US6142249ANov 7, 2000
Earth-boring bit with improved bearing seal
BAKER HUGHES INC32 citations92
US5351771AOct 4, 1994
Earth-boring bit having an improved hard-faced tooth structure
BAKER HUGHES INC31 citations92
US7472764B2Jan 6, 2009
Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture
BAKER HUGHES INC15 citations91
US6374704B1Apr 23, 2002
Steel-tooth bit with improved toughness
BAKER HUGHES INC24 citations91
US7861805B2Jan 4, 2011
Conformal bearing for rock drill bit
BAKER HUGHES INC35 citations90
US7845435B2Dec 7, 2010
Hybrid drill bit and method of drilling
BAKER HUGHES INC46 citations90
US8356398B2Jan 22, 2013
Modular hybrid drill bit
BAKER HUGHES INC26 citations89
US5295549AMar 22, 1994
Mechanical lock to prevent seal ring rotation
BAKER HUGHES INC42 citations86
US9353575B2May 31, 2016
Hybrid drill bits having increased drilling efficiency
BAKER HUGHES INC9 citations82
US9187960B2Nov 17, 2015
Expandable reamer tools
BAKER HUGHES INC8 citations82
US7997354B2Aug 16, 2011
Expandable reamers for earth-boring applications and methods of using the same
BAKER HUGHES INC11 citations82
US7841426B2Nov 30, 2010
Hybrid drill bit with fixed cutters as the sole cutting elements in the axial center of the drill bit
BAKER HUGHES INC9 citations81
US10190366B2Jan 29, 2019
Hybrid drill bits having increased drilling efficiency
BAKER HUGHES INC3 citations71
US10072462B2Sep 11, 2018
Hybrid drill bits
BAKER HUGHES INC2 citations71
US9670736B2Jun 6, 2017
Hybrid drill bit
BAKER HUGHES INC3 citations71
US10316589B2Jun 11, 2019
Hybrid drill bit and design method
BAKER HUGHES INC1 citations62
US9249629B2Feb 2, 2016
Enhanced backup ring edge features for metal face seal in roller cone drill bits
BAKER HUGHES INC2 citations62
US9157280B2Oct 13, 2015
Enhanced backup ring features for metal face seal in roller cone drill bits
BAKER HUGHES INC2 citations62
US7861806B2Jan 4, 2011
Shank structure for rotary drill bits
BAKER HUGHES INC3 citations61
US7600589B2Oct 13, 2009
Rotary drill bits
BAKER HUGHES INC2 citations61
US7594454B2Sep 29, 2009
Methods of fabricating rotary drill bits
BAKER HUGHES INC3 citations61
US8028770B2Oct 4, 2011
Conformal bearing for rock drill bit
BAKER HUGHES INC3 citations60
US9810026B2Nov 7, 2017
Earth-boring tools and methods of forming earth-boring tools
BAKER HUGHES INC0 citations52
US7975779B2Jul 12, 2011
Threaded cone retention system for roller cone bits
BAKER HUGHES INC0 citations51
ZAHRADNIK ANTON F
4 patentsUS8678111B2Mar 25, 2014
Hybrid drill bit and design method
ZAHRADNIK ANTON F18 citations91
US8925654B2Jan 6, 2015
Earth-boring tools and methods of forming earth-boring tools
ZAHRADNIK ANTON F9 citations83
US8141664B2Mar 27, 2012
Hybrid drill bit with high bearing pin angles
ZAHRADNIK ANTON F13 citations83
US8459378B2Jun 11, 2013
Hybrid drill bit
ZAHRADNIK ANTON F8 citations82