Granted Patent
Utility
US 4,794,409 · App. 07/129,030
Ink jet pen having improved ink storage and distribution capabilities
Inventors:
Bruce Cowger, Robert R. Beeson
Patented Case
View Patent ↗
Granted: Dec 27, 1988
Filed: Dec 3, 1987
Inventors
Bruce Cowger
Robert R. Beeson
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.