Granted Patent
Utility
US 4,453,957 · App. 06/446,363
Double column multiple condenser-reboiler high pressure nitrogen process
Inventors:
Ravindra F. Pahade, John H. Ziemer, Harry Cheung
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Dec 2, 1982
Inventors
Ravindra F. Pahade
John H. Ziemer
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.