Granted Patent
Utility
US 5,841,454 · App. 08/519,384
Ink-jet pen gas separator and purge system
Inventors:
Ronald W. Hall, David R. Otis, Jr.
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: Aug 25, 1995
Inventors
Ronald W. Hall
David R. Otis, Jr.
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.