Granted Patent
Utility
US 4,703,774 · App. 06/805,028
Subsea safety check valve system
Inventor:
Randall Seehausen
Patented Case
View Patent ↗
Granted: Nov 3, 1987
Filed: Dec 4, 1985
Inventor
Randall Seehausen
Assignee (at issue)
Vetco Gray, LLC
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.