Granted Patent
Utility
US 4,716,969 · App. 07/002,323
Hydraulic valve actuating means for subsurface safety valve
Inventor:
Ronald E. Pringle
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Jan 12, 1987
Inventor
Ronald E. Pringle
Assignee (at issue)
Camco 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.