Granted Patent
Utility
US 4,345,879 · App. 06/100,896
Hydraulic switch for a pump
Inventor:
Charles W. Steiner
Patented Case
View Patent ↗
Granted: Aug 24, 1982
Filed: Dec 6, 1979
Inventor
Charles W. Steiner
Assignee (at issue)
Simer Pump 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.