Granted Patent
Utility
US 5,010,919 · App. 07/484,055
Subsea barrier valve
Inventor:
Charles C. Partridge
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Feb 23, 1990
Inventor
Charles C. Partridge
Assignee (at issue)
Tom Wheatley Valve 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.