Granted Patent
Utility
US 4,624,315 · App. 06/658,275
Subsurface safety valve with lock-open system
Inventors:
Rennie L. Dickson, Roddie R. Smith
Patented Case
View Patent ↗
Granted: Nov 25, 1986
Filed: Oct 5, 1984
Inventors
Rennie L. Dickson
Roddie R. Smith
Assignee (at issue)
Otis Engineering Corporation
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.