Granted Patent
Utility
US 4,311,566 · App. 06/173,774
Electrolyte permeable diaphragm
Inventor:
Mary E. McCann
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: Jul 30, 1980
Inventor
Mary E. McCann
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.