Granted Patent
Utility
US 6,153,133 · App. 09/331,649
Method of producing highly permeable microporous polyolefin membrane
Inventors:
Norimitsu Kaimai, Kotaro Takita, Koichi Kono, Hidehiko Funaoka
Patented Case
View Patent ↗
Granted: Nov 28, 2000
Filed: Jun 23, 1999
Inventors
Norimitsu Kaimai
Kotaro Takita
Koichi Kono
Hidehiko Funaoka
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.