Granted Patent
Utility
US 4,885,522 · App. 07/272,142
Constant current source and battery charger
Inventor:
John G. Konopka
Patented Case
View Patent ↗
Granted: Dec 5, 1989
Filed: Nov 16, 1988
Inventor
John G. Konopka
Assignee (at issue)
Zenith Electronics LLC
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.