Granted Patent
Utility
US 4,402,818 · App. 06/139,614
Electrofiltration system for purifying organic liquids
Inventor:
Serafin B. Oberton
Patented Case
View Patent ↗
Granted: Sep 6, 1983
Filed: Apr 11, 1980
Inventor
Serafin B. Oberton
Assignee (at issue)
Petrolite Corporation
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.