Granted Patent
Utility
US 5,873,411 · App. 08/835,312
Double acting reciprocating piston pump
Inventor:
John Gilbert Prentiss
Patented Case
View Patent ↗
Granted: Feb 23, 1999
Filed: Apr 7, 1997
Inventor
John Gilbert Prentiss
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.