Granted Patent
Utility
US 6,209,641 · App. 09/430,598
Method and apparatus for producing fluids while injecting gas through the same wellbore
Inventor:
Mark D. Stevenson
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Oct 29, 1999
Inventor
Mark D. Stevenson
Assignee (at issue)
Atlantic Richfield 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.