Granted Patent
Utility
US 4,441,861 · App. 06/282,138
Well production apparatus and method
Inventor:
Carlos R. Canalizo
Patented Case
View Patent ↗
Granted: Apr 10, 1984
Filed: Jul 10, 1981
Inventor
Carlos R. Canalizo
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.