Granted Patent
Utility
US 4,883,409 · App. 07/246,479
Pumping apparatus for delivering liquid at high pressure
Inventors:
Fred Strohmeier, Klaus Witt
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Sep 19, 1988
Inventors
Fred Strohmeier
Klaus Witt
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.