Granted Patent
Utility
US 4,664,606 · App. 06/679,039
Reciprocating pump for fluids, specifically such contaminated by solids
Inventor:
Ernst Korthaus
Patented Case
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Granted: May 12, 1987
Filed: Nov 30, 1984
Inventor
Ernst Korthaus
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.