Granted Patent
Utility
US 6,823,941 · App. 10/415,156
Recovery of production fluids from an oil or gas well
Inventor:
Ian Donald
Patented Case
View Patent ↗
Granted: Nov 30, 2004
Filed: Apr 25, 2003
Inventor
Ian Donald
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.