Granted Patent
Utility
US 4,570,833 · App. 06/526,906
Pumping system
Inventor:
John A. Vanderjagt
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Aug 26, 1983
Inventor
John A. Vanderjagt
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.