Granted Patent
Utility
US 4,920,362 · App. 07/286,567
Volumetrically efficient ink jet pen capable of extreme altitude and temperature excursions
Inventor:
Bruce Cowger
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Dec 16, 1988
Inventor
Bruce Cowger
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.