Granted Patent
Utility
US 4,415,345 · App. 06/362,048
Process to separate nitrogen from natural gas
Inventor:
Brian R. Swallow
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Mar 26, 1982
Inventor
Brian R. Swallow
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.