Granted Patent
Utility
US 4,194,891 · App. 05/973,551
Multiple bed rapid pressure swing adsorption for oxygen
Inventors:
David E. Earls, Gary N. Long
Patented Case
View Patent ↗
Granted: Mar 25, 1980
Filed: Dec 27, 1978
Inventors
David E. Earls
Gary N. Long
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.