Granted Patent
Utility
US 4,643,743 · App. 06/465,434
Pressure swing adsorption process for supplying oxygen under variable demand conditions
Inventor:
Ronald J. Grader
Patented Case
View Patent ↗
Granted: Feb 17, 1987
Filed: Feb 10, 1983
Inventor
Ronald J. Grader
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.