Granted Patent
Utility
US 5,673,072 · App. 08/332,009
Method and apparatus for refilling a print cartridge having a spherical stopper
Inventor:
Joseph E. Scheffelin
Patented Case
View Patent ↗
Granted: Sep 30, 1997
Filed: Oct 31, 1994
Inventor
Joseph E. Scheffelin
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.