Granted Patent
Utility
US 6,051,957 · App. 09/176,574
Battery pack having a state of charge indicator
Inventor:
David N. Klein
Patented Case
View Patent ↗
Granted: Apr 18, 2000
Filed: Oct 21, 1998
Inventor
David N. Klein
Assignee (at issue)
Duracell Inc.
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.