Granted Patent
Utility
US 5,853,633 · App. 08/666,074
Method of producing microporous thermoplastic resin membrane
Inventors:
Koichi Kono, Kotaro Takita
Patented Case
View Patent ↗
Granted: Dec 29, 1998
Filed: Jun 19, 1996
Inventors
Koichi Kono
Kotaro Takita
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.