Granted Patent
Utility
US 5,689,171 · App. 08/426,229
Battery charger
Inventor:
Christopher J. Ludewig
Patented Case
View Patent ↗
Granted: Nov 18, 1997
Filed: Apr 21, 1995
Inventor
Christopher J. Ludewig
Assignee (at issue)
E.F. Johnson Company
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.