Inventor
MOVAFFAGH BEHROOZ
CA4 patents
Patents
4 patentsUS7090033B2Aug 15, 2006
Drill string shutoff valve
VETCO GRAY INC19 citations89
US7017682B2Mar 28, 2006
Drill string shutoff valve
VETCO GRAY INC14 citations78
US6918452B2Jul 19, 2005
Drill string shutoff valve
VETCO GRAY INC14 citations76
US9187976B2Nov 17, 2015
Apparatus and methods for releasing drilling rig and blowout preventer (BOP) prior to cement bonding
VETCO GRAY INC0 citations37