Granted Patent
Utility
US 5,948,826 · App. 08/898,957
Heterogeneous ion exchange membrane and process for its production
Inventors:
Ichiro Terada, Yoshiaki Higuchi, Haruhisa Miyake, Kazuo Umemura
Patented Case
View Patent ↗
Granted: Sep 7, 1999
Filed: Jul 23, 1997
Inventors
Ichiro Terada
Yoshiaki Higuchi
Haruhisa Miyake
Kazuo Umemura
Assignee (at issue)
ASAHI GLASS CO., LTD.
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.