Granted Patent
Utility
US 4,473,540 · App. 06/511,549
High efficiency chlorine dioxide process
Inventor:
Maurice C. J. Fredette
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Jul 7, 1983
Inventor
Maurice C. J. Fredette
Assignee (at issue)
ERCO Industries Limited
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.