Granted Patent
Utility
US 4,994,110 · App. 07/455,465
Dyes containing lithium for ink-jet printing inks
Inventors:
John L. Stoffel, Ronald A. Askeland, William D. Kappele
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Dec 22, 1989
Inventors
John L. Stoffel
Ronald A. Askeland
William D. Kappele
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.