Granted Patent
Utility
US 4,600,518 · App. 06/754,720
Choline for neutralizing naphthenic acid in fuel and lubricating oils
Inventors:
Donald G. Ries, Glenn L. Roof
Patented Case
View Patent ↗
Granted: Jul 15, 1986
Filed: Jul 15, 1985
Inventors
Donald G. Ries
Glenn L. Roof
Assignee (at issue)
Nalco Chemical Company
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.