Granted Patent
Utility
US 4,990,165 · App. 07/413,094
Permeable membranes for enhanced gas separation
Inventors:
Benjamin Bikson, James E. Miller, Joyce K. Nelson
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Sep 27, 1989
Inventors
Benjamin Bikson
James E. Miller
Joyce K. Nelson
Assignee (at issue)
Union Carbide Industrial Gases Technology 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.