Granted Patent
Utility
US 5,151,189 · App. 07/583,640
Cationic charge modified microporous membrane
Inventors:
Ho-Pin Hu, Inessa Katsnelson, Alan Sellinger
Patented Case
View Patent ↗
Granted: Sep 29, 1992
Filed: Sep 17, 1990
Inventors
Ho-Pin Hu
Inessa Katsnelson
Alan Sellinger
Assignee (at issue)
Gelman Sciences
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.