Granted Patent
Utility
US 5,583,545 · App. 08/331,453
Ink level detection in a pressure regulated pen
Inventors:
Norman E. Pawlowski, Jr., Mark Hauck, Bruce Cowger, Steven B. Elgee, Paul D. Gast
Patented Case
View Patent ↗
Granted: Dec 10, 1996
Filed: Oct 31, 1994
Inventors
Norman E. Pawlowski, Jr.
Mark Hauck
Bruce Cowger
Steven B. Elgee
Paul D. Gast
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.