Granted Patent
Utility
US 5,830,554 · App. 08/718,672
Method of producing of microporous polyolefin membrane
Inventors:
Norimitsu Kaimai, Kotaro Takita, Koichi Kono
Patented Case
View Patent ↗
Granted: Nov 3, 1998
Filed: Sep 24, 1996
Inventors
Norimitsu Kaimai
Kotaro Takita
Koichi Kono
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.