Granted Patent
Utility
US 5,507,467 · App. 08/116,456
Actuator for a drill string internal blowout preventer
Inventor:
Keith C. Mott
Patented Case
View Patent ↗
Granted: Apr 16, 1996
Filed: Sep 3, 1993
Inventor
Keith C. Mott
Assignee (at issue)
Hydril Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.