Granted Patent
Utility
US 5,840,439 · App. 08/961,994
Battery cover
Inventors:
Robert W. Fritts, David M. Revak
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Oct 11, 1997
Inventors
Robert W. Fritts
David M. Revak
Assignee (at issue)
Douglas Battery Manufacturing 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.