Granted Patent
Utility
US 6,164,493 · App. 09/566,166
Oil recovery method
Inventor:
William D. Shelton, Jr.
Patented Case
View Patent ↗
Granted: Dec 26, 2000
Filed: May 5, 2000
Inventor
William D. Shelton, Jr.
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.