Granted Patent
Utility
US 4,402,228 · App. 06/270,495
Apparatus and method for testing the hardness of battery components
Inventor:
William J. Eberle
Patented Case
View Patent ↗
Granted: Sep 6, 1983
Filed: Jun 4, 1981
Inventor
William J. Eberle
Assignee (at issue)
General Battery Corporation
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.