Granted Patent
Utility
US 4,251,503 · App. 06/075,098
Efficiency control system for chlorine dioxide plants
Inventors:
Richard Swindells, Gerald Cowley
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Sep 13, 1979
Inventors
Richard Swindells
Gerald Cowley
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.