Granted Patent
Utility
US 5,786,396 · App. 08/899,778
Method of producing microporous polyolefin membrane
Inventors:
Kotaro Takita, Koichi Kono, Norimitsu Kaimai
Patented Case
View Patent ↗
Granted: Jul 28, 1998
Filed: Jul 24, 1997
Inventors
Kotaro Takita
Koichi Kono
Norimitsu Kaimai
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.