Granted Patent
Utility
US 3,934,275 · App. 05/449,534
Oil recovery system
Inventor:
Norris J. Bishton, Jr.
Patented Case
View Patent ↗
Granted: Jan 27, 1976
Filed: Mar 8, 1974
Inventor
Norris J. Bishton, 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.