Granted Patent
Utility
US 4,478,921 · App. 06/536,784
Manganese carbonate additive for manganese dioxide-containing nonaqueous cells
Inventor:
Richard A. Langan
Patented Case
View Patent ↗
Granted: Oct 23, 1984
Filed: Sep 28, 1983
Inventor
Richard A. Langan
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.