Granted Patent
Utility
US 5,223,351 · App. 07/792,296
Dual battery system
Inventor:
William J. Wruck
Patented Case
View Patent ↗
Granted: Jun 29, 1993
Filed: Nov 14, 1991
Inventor
William J. Wruck
Assignee (at issue)
Globe-Union 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.