Granted Patent
Utility
US 5,511,619 · App. 08/350,475
Polymer liners in rod pumping wells
Inventor:
William E. Jackson
Patented Case
View Patent ↗
Granted: Apr 30, 1996
Filed: Dec 7, 1994
Inventor
William E. Jackson
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.