Granted Patent
Utility
US 4,627,969 · App. 06/649,923
Production of chlorine dioxide
Inventors:
Maurice C. J. Fredette, Ching-Shi Yang
Patented Case
View Patent ↗
Granted: Dec 9, 1986
Filed: Sep 13, 1984
Inventors
Maurice C. J. Fredette
Ching-Shi Yang
Assignee (at issue)
Tenneco Canada Inc.
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.