Granted Patent
Utility
US 4,208,396 · App. 05/865,950
Oxygen recovery from gas mixtures
Inventor:
John H. Norman
Patented Case
View Patent ↗
Granted: Jun 17, 1980
Filed: Dec 30, 1977
Inventor
John H. Norman
Assignee (at issue)
General Atomics
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.