Granted Patent
Utility
US 4,526,947 · App. 06/378,154
N,N-Dimethylacrylamide copolymer injection water viscosifier for enhanced oil recovery
Inventor:
Kenneth F. Castner
Patented Case
View Patent ↗
Granted: Jul 2, 1985
Filed: May 14, 1982
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.