Granted Patent
Utility
US 4,438,185 · App. 06/414,747
Hydrophilic polymer coated microporous membranes capable of use as a battery separator
Inventor:
Henry T. Taskier
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Sep 3, 1982
Inventor
Henry T. Taskier
Assignee (at issue)
Celanese GmbH
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.