Granted Patent
Utility
US 4,664,686 · App. 06/827,165
Process to separate nitrogen and methane
Inventors:
Ravindra F. Pahade, James J. Maloney, James R. Handley
Patented Case
View Patent ↗
Granted: May 12, 1987
Filed: Feb 7, 1986
Inventors
Ravindra F. Pahade
James J. Maloney
James R. Handley
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.