Granted Patent
Utility
US 4,439,296 · App. 06/316,198
Method for repairing perfluorinated polymeric microporous electrolytic cell separators by heat sealing
Inventor:
Rajeshwar Swarup
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Oct 29, 1981
Inventor
Rajeshwar Swarup
Assignee (at issue)
Occidental Chemical 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.