Granted Patent
Utility
US 5,072,167 · App. 07/527,100
Autopolarity battery charger
Inventor:
Joseph M. Zias
Patented Case
View Patent ↗
Granted: Dec 10, 1991
Filed: May 22, 1990
Inventor
Joseph M. Zias
Assignee (at issue)
Acme Electric 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.