Granted Patent
Utility
US 5,144,882 · App. 07/598,894
Shaft seal system for a piston pump separating impurities
Inventor:
Hans-Georg Weissgerber
Patented Case
View Patent ↗
Granted: Sep 8, 1992
Filed: Oct 16, 1990
Inventor
Hans-Georg Weissgerber
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.