Granted Patent
Utility
US 5,944,972 · App. 09/047,409
Method for producing deionized water
Inventors:
Hiroshi Toda, Tohru Hoshi, David Florian Tessier
Patented Case
View Patent ↗
Granted: Aug 31, 1999
Filed: Mar 25, 1998
Inventors
Hiroshi Toda
Tohru Hoshi
David Florian Tessier
Assignees (at issue)
ASAHI GLASS CO., LTD.
Glegg Water Conditioning, Incorporated
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.