Granted Patent
Utility
US 4,592,850 · App. 06/708,183
Injection water viscosifier for enhanced oil recovery
Inventor:
Kenneth F. Castner
Patented Case
View Patent ↗
Granted: Jun 3, 1986
Filed: Mar 4, 1985
Inventor
Kenneth F. Castner
Assignee (at issue)
THE GOODYEAR TIRE & RUBBER 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.