Granted Patent
Utility
US 5,922,492 · App. 08/864,079
Microporous polyolefin battery separator
Inventors:
Kotaro Takita, Koichi Kono, Norimitsu Kaimai, Soichiro Yamaguchi
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: May 28, 1997
Inventors
Kotaro Takita
Koichi Kono
Norimitsu Kaimai
Soichiro Yamaguchi
Assignee (at issue)
Tonen 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.