Granted Patent
Utility
US 6,328,104 · App. 09/490,958
Upgrading and recovery of heavy crude oils and natural bitumens by in situ hydrovisbreaking
Inventor:
Dennis J. Graue
Patented Case
View Patent ↗
Granted: Dec 11, 2001
Filed: Jan 24, 2000
Inventor
Dennis J. Graue
Assignee (at issue)
World Energy Systems Incorporated
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.