Granted Patent
Utility
US 4,472,175 · App. 06/509,626
Asymmetric gas separation membranes
Inventors:
Raymond F. Malon, Anthony Zampini
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Jun 30, 1983
Inventors
Raymond F. Malon
Anthony Zampini
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.