Granted Patent
Utility
US 4,646,836 · App. 06/684,247
Tertiary recovery method using inverted deviated holes
Inventor:
Milton E. Goodhart
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Dec 20, 1984
Inventor
Milton E. Goodhart
Assignee (at issue)
Hydril 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.