Granted Patent
Utility
US 5,397,445 · App. 08/183,233
Method for producing an acid and/or alkali metal hydroxide
Inventors:
Kazuo Umemura, Tsutomu Naganuma, Haruhisa Miyake
Patented Case
View Patent ↗
Granted: Mar 14, 1995
Filed: Jan 19, 1994
Inventors
Kazuo Umemura
Tsutomu Naganuma
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.