Granted Patent
Utility
US 5,793,389 · App. 08/533,130
Fluid purge apparatus and method for ink jet printer pen
Inventor:
Robert Mitchell
Patented Case
View Patent ↗
Granted: Aug 11, 1998
Filed: Sep 25, 1995
Inventor
Robert Mitchell
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.