Granted Patent
Utility
US 4,352,685 · App. 06/276,899
Process for removing nitrogen from natural gas
Inventor:
Brian R. Swallow
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: Jun 24, 1981
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.