Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Drill string shutoff valve

Drill string shutoff valve

US Patent 6918452 · Granted Jul 19, 2005

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Electrically insulated tubing hanger system2020
System and method for rotating casing string2018
System and method for rotating casing string2017
Apparatus and methods for releasing drilling rig and blowout preventer (BOP) pri2015
Method and apparatus for launching multiple balls in a well2015
Scalloped landing ring2014
Backup safety flow control system for concentric drill string2012
Wellhead isolation sleeve assembly2010
Backup safety flow control system for concentric drill string2010
Drill string shutoff valve2006
Drill string shutoff valve2006
Remedial system to flush contaminants from tubing string2006