Granted Patent
Utility
US 4,592,970 · App. 06/654,949
Electrochemical cell having a safety vent closure
Inventor:
Ronald L. Zupancic
Patented Case
View Patent ↗
Granted: Jun 3, 1986
Filed: Sep 27, 1984
Inventor
Ronald L. Zupancic
Assignee (at issue)
Union Carbide 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.