Granted Patent
Utility
US 5,812,168 · App. 08/630,698
Air purging of a pressure regulated free-ink ink-jet pen
Inventors:
Norman E. Pawlowski, Jr., Ronald W. Hall
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: Apr 12, 1996
Inventors
Norman E. Pawlowski, Jr.
Ronald W. Hall
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.