Granted Patent
Utility
US 4,224,393 · App. 06/038,007
Battery separator
Inventors:
Stewart Carl Feinberg, Christian B. Lundsager, Joseph T. Lundquist, Robert A. Balouskus
Patented Case
View Patent ↗
Granted: Sep 23, 1980
Filed: May 10, 1979
Inventors
Stewart Carl Feinberg
Christian B. Lundsager
Joseph T. Lundquist
Robert A. Balouskus
Assignee (at issue)
W. R. Grace & Co.
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.