Granted Patent
Utility
US 5,247,997 · App. 07/866,702
Tubing hanger with a preloaded lockdown
Inventor:
William F. Puccio
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Apr 10, 1992
Inventor
William F. Puccio
Assignee (at issue)
Cooper Industries Holdings
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.