Granted Patent
Utility
US 5,640,183 · App. 08/277,723
Redundant nozzle dot matrix printheads and method of use
Inventor:
David E. Hackleman
Patented Case
View Patent ↗
Granted: Jun 17, 1997
Filed: Jul 20, 1994
Inventor
David E. Hackleman
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.