Granted Patent
Utility
US 5,526,030 · App. 07/957,534
Pressure control apparatus for an ink pen
Inventors:
Marc A. Baldwin, Ella M. Duyck, Mark McCarty, Lowell R. McDaniel, John M. Altendorf, Joseph R. Elliot, Bruce Cowger
Patented Case
View Patent ↗
Granted: Jun 11, 1996
Filed: Oct 5, 1992
Inventors
Marc A. Baldwin
Ella M. Duyck
Mark McCarty
Lowell R. McDaniel
John M. Altendorf
Joseph R. Elliot
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.