Granted Patent
Utility
US 4,431,052 · App. 06/207,946
Downhole seal for low profile oil well pumping installations
Inventor:
Robert G. James
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Nov 18, 1980
Inventor
Robert G. James
Assignee (at issue)
Armco 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.