Granted Patent
Utility
US 4,557,896 · App. 06/271,872
Treatment of aqueous systems
Inventors:
Philip Brocklebank, John J. Bennison
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Jun 9, 1981
Inventors
Philip Brocklebank
John J. Bennison
Assignee (at issue)
Dearborn Chemical Company 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.