Granted Patent
Utility
US 5,643,460 · App. 08/497,359
Method for separating oil from water in petroleum production
Inventors:
Robert A. Marble, Manian Ramesh, Norman Edward Byrne
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jun 30, 1995
Inventors
Robert A. Marble
Manian Ramesh
Norman Edward Byrne
Assignee (at issue)
Nalco/Exxon Energy Chemicals, L.P.
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.