Granted Patent
Utility
US 4,469,764 · App. 06/449,574
Seal closure for a galvanic dry cell
Inventor:
Brooke Schumm, Jr.
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Dec 14, 1982
Inventor
Brooke Schumm, Jr.
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.