Granted Patent
Utility
US 4,268,011 · App. 06/051,427
Stud tensioner for blowout preventer
Inventor:
Ross D. Randall
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Jun 22, 1979
Inventor
Ross D. Randall
Assignee (at issue)
Cameron Iron Works, Inc.
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.