Granted Patent
Utility
US 5,149,403 · App. 07/629,643
Fluorine-containing cation exchange membrane for electrolysis and process for producing alkali metal hydroxide by using the same
Inventors:
Tetsuji Shimohira, Yoshiaki Higuchi, Yoshihiko Saito, Kohji Suzuki
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Dec 7, 1990
Inventors
Tetsuji Shimohira
Yoshiaki Higuchi
Yoshihiko Saito
Kohji Suzuki
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.