P

Inventor

BLACKMAN MARK P

US15 patents
⚠️ This page may combine multiple inventors who share the name “BLACKMAN MARK P”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HALLIBURTON ENERGY SERV INC

4 patents
US6802380B2Oct 12, 2004

Pressure relief system and methods of use and making

HALLIBURTON ENERGY SERV INC32 citations92
US6752223B2Jun 22, 2004

Roller cone bit with improved seal gland design

HALLIBURTON ENERGY SERV INC19 citations88
US7543660B2Jun 9, 2009

Roller cone drill bit with debris diverter plugs

HALLIBURTON ENERGY SERV INC3 citations60
US7484572B2Feb 3, 2009

Roller cone drill bit with debris flow paths through associated support arms

HALLIBURTON ENERGY SERV INC1 citations49

DRESSER IND

3 patents
US5518077AMay 21, 1996

Rotary drill bit with improved cutter and seal protection

DRESSER IND169 citations98
US5452771ASep 26, 1995

Rotary drill bit with improved cutter and seal protection

DRESSER IND167 citations98
US5429200AJul 4, 1995

Rotary drill bit with improved cutter

DRESSER IND107 citations97

BAKER HUGHES INC

3 patents
US9670736B2Jun 6, 2017

Hybrid drill bit

BAKER HUGHES INC3 citations71
US10316589B2Jun 11, 2019

Hybrid drill bit and design method

BAKER HUGHES INC1 citations62
US9782857B2Oct 10, 2017

Hybrid drill bit having increased service life

BAKER HUGHES INC1 citations49

ZAHRADNIK ANTON F

2 patents
US8678111B2Mar 25, 2014

Hybrid drill bit and design method

ZAHRADNIK ANTON F18 citations91
US8459378B2Jun 11, 2013

Hybrid drill bit

ZAHRADNIK ANTON F8 citations82

(unassigned)

1 patent
US6279671B1Aug 28, 2001

Roller cone bit with improved seal gland design

54 citations90

NGUYEN DON Q

1 patent
US8978786B2Mar 17, 2015

System and method for adjusting roller cone profile on hybrid bit

NGUYEN DON Q4 citations66

BAKER HUGHES HOLDINGS LLC

1 patent
US10871036B2Dec 22, 2020

Hybrid drill bit and design method

BAKER HUGHES HOLDINGS LLC0 citations51