Granted Patent
Utility
US 4,361,601 · App. 06/207,592
Method of forming a permionic membrane
Inventors:
Patrick E. Hillman, Preston S. White
Patented Case
View Patent ↗
Granted: Nov 30, 1982
Filed: Nov 17, 1980
Inventors
Patrick E. Hillman
Preston S. White
Assignee (at issue)
PPG Industries, Inc.
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.