Granted Patent
Utility
US 6,334,941 · App. 09/057,450
Apparatus for producing deionized water
Inventor:
Junjiro Iwamoto
Patented Case
View Patent ↗
Granted: Jan 1, 2002
Filed: Apr 9, 1998
Inventor
Junjiro Iwamoto
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.