Granted Patent
Utility
US 5,565,281 · App. 08/348,630
Shutdown, bilayer battery separator
Inventors:
Wei-Ching Yu, Margaret W. Geiger
Patented Case
View Patent ↗
Granted: Oct 15, 1996
Filed: Dec 2, 1994
Inventors
Wei-Ching Yu
Margaret W. Geiger
Assignee (at issue)
Hoechst Celanese 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.