Granted Patent
Utility
US 5,221,452 · App. 07/654,060
Monopolar ion exchange membrane electrolytic cell assembly
Inventors:
Makoto Nakao, Hidenori Shibata, Takeo Aikawa, Takahiro Uchibori, Hiroki Yano
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Feb 12, 1991
Inventors
Makoto Nakao
Hidenori Shibata
Takeo Aikawa
Takahiro Uchibori
Hiroki Yano
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.