Granted Patent
Utility
US 4,694,308 · App. 06/939,284
Barrier layer and orifice plate for thermal ink jet printhead assembly
Inventors:
C. S. Chan, Robert R. Hay
Patented Case
View Patent ↗
Granted: Sep 15, 1987
Filed: Dec 4, 1986
Inventors
C. S. Chan
Robert R. Hay
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.