Granted Patent
Utility
US 5,716,504 · App. 08/666,213
Cation exchange membrane for electrolysis and process for producing potassium hydroxide of high purity
Inventors:
Yoshihiko Saito, Tetsuji Shimohira, Haruhisa Miyake
Patented Case
View Patent ↗
Granted: Feb 10, 1998
Filed: Jun 20, 1996
Inventors
Yoshihiko Saito
Tetsuji Shimohira
Haruhisa Miyake
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.