Granted Patent
Utility
US 4,867,766 · App. 07/242,605
Oxygen enriched air system
Inventors:
Michael J. Campbell, James Smolarek, John J. Pietruszewski
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Sep 12, 1988
Inventors
Michael J. Campbell
James Smolarek
John J. Pietruszewski
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.