Granted Patent
Utility
US 4,309,289 · App. 06/128,138
Method of filtering oil from oil-and-water emulsions
Inventor:
Brian Arthur Head
Patented Case
View Patent ↗
Granted: Jan 5, 1982
Filed: Mar 7, 1980
Inventor
Brian Arthur Head
Assignee (at issue)
Whatman Reeve Angel 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.