Granted Patent
Utility
US 4,407,367 · App. 06/196,771
Method for in situ recovery of heavy crude oils and tars by hydrocarbon vapor injection
Inventor:
Paul H. Kydd
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Oct 14, 1980
Inventor
Paul H. Kydd
Assignee (at issue)
HRI
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.