Granted Patent
Utility
US 4,439,290 · App. 06/267,310
Process for the separation of oil-in-water emulsions by electrolysis
Inventors:
Hans-Rudolf Marfurt, August Zurrer
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: May 28, 1981
Inventors
Hans-Rudolf Marfurt
August Zurrer
Assignee (at issue)
Ciba-Geigy
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.