Granted Patent
Utility
US 4,448,595 · App. 06/446,400
Split column multiple condenser-reboiler air separation process
Inventor:
Harry Cheung
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Dec 2, 1982
Inventor
Harry Cheung
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.