Granted Patent
Utility
US 4,473,122 · App. 06/561,468
Downhole safety system for use while servicing wells
Inventor:
Jack W. Tamplen
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Dec 14, 1983
Inventor
Jack W. Tamplen
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.