Granted Patent
Utility
US 4,597,777 · App. 06/466,686
Membrane gas separation processes
Inventor:
Tommy E. Graham
Patented Case
View Patent ↗
Granted: Jul 1, 1986
Filed: Feb 15, 1983
Inventor
Tommy E. Graham
Assignee (at issue)
Monsanto Company
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.