Granted Patent
Utility
US 4,433,990 · App. 06/328,631
Process to recover argon from oxygen-only air separation plant
Inventor:
Walter Joseph Olszewski
Patented Case
View Patent ↗
Granted: Feb 28, 1984
Filed: Dec 8, 1981
Inventor
Walter Joseph Olszewski
Assignee (at issue)
Union Carbide 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.