Granted Patent
Utility
US 6,566,012 · App. 09/673,455
Polyolefin microporous film and method for preparing the same
Inventors:
Kotaro Takita, Hidehiko Funaoka, Norimitsu Kaimai, Shigeaki Kobayashi, Koichi Kono
Patented Case
View Patent ↗
Granted: May 20, 2003
Filed: Dec 1, 2000
Inventors
Kotaro Takita
Hidehiko Funaoka
Norimitsu Kaimai
Shigeaki Kobayashi
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.