Granted Patent
Utility
US 4,146,681 · App. 05/864,083
Seal closure for a galvanic cell
Inventor:
Frank G. Spanur
Patented Case
View Patent ↗
Granted: Mar 27, 1979
Filed: Dec 23, 1977
Inventor
Frank G. Spanur
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.