Inventor
CHAN KWONG-ONN C
CA4 patents
Patents
4 patentsUS7090033B2Aug 15, 2006
Drill string shutoff valve
VETCO GRAY INC19 citations89
US7069995B2Jul 4, 2006
Remedial system to flush contaminants from tubing string
VETCO GRAY INC43 citations86
US7017682B2Mar 28, 2006
Drill string shutoff valve
VETCO GRAY INC14 citations78
US6918452B2Jul 19, 2005
Drill string shutoff valve
VETCO GRAY INC14 citations76