Granted Patent
Utility
US 4,490,447 · App. 06/597,386
Battery separators
Inventor:
William R. Battersby
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Apr 6, 1984
Inventor
William R. Battersby
Assignee (at issue)
USM Holding AG
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.